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Presentation classification of pressure measuring devices. Pressure gauges. more pressure is generated by the fluid

Slide 2

What is a pressure gauge

Pressure gauge (from Greek word“manos” - rare, loose, rarefied and “metreo” - measuring) - a device that measures pressure greater or less than atmospheric pressure.

Slide 3

What types of pressure gauges are there?

  • Depending on the design and sensitivity of the element, there are liquid, deadweight, and deformation pressure gauges (with tubular spring or membrane).
  • Pressure gauges are divided into accuracy classes: 0.15; 0.25; 0.4; 0.6; 1.0; 1.5; 2.5; 4.0 (than less number, the more accurate the device).

  • Slide 4

    Types of pressure gauges

  • Slide 5

    Accuracy classes

    • Accuracy class is the main metrological characteristic of a device, which determines the permissible values ​​of the main and additional errors that affect the measurement accuracy.
    • For pointer instruments, it is customary to indicate the accuracy class, written in the form of a number.

  • Slide 6

    General technical pressure gauge

    Designed for measuring liquids, gases and vapors that are not aggressive to copper alloys.

    Slide 7

    Electric contact pressure gauge

    They have the ability to adjust the measured medium due to the presence of an electric contact mechanism.

    Slide 8

    Types of special pressure gauges

    • oxygen;
    • acetylenic;
    • ammonia.

  • Slide 9

    Special oxygen pressure gauge

    Oxygen ones must be degreased, since sometimes even slight contamination of the mechanism upon contact with pure oxygen can lead to an explosion. Often available in cases blue color with the designation on the dial O2 (oxygen).

    Slide 10

    Special acetylene pressure gauge

    Acetylene does not allow copper alloys in the manufacture of the measuring mechanism, since upon contact with acetylene there is a danger of the formation of explosive acetylene copper.

    Slide 11

    Special ammonia pressure gauge

    Ammonia must be corrosion-resistant.

    Slide 12

    Recording pressure gauge

    Pressure gauges in a housing, with a mechanism that allows you to reproduce the operating graph of the pressure gauge on chart paper.

    Slide 13

    How does a liquid pressure gauge work?

    To understand how a pressure gauge works, it can be connected by a rubber tube to a round flat box, one side of which is covered with rubber film. If you lightly press the film with your finger, the liquid level in the pressure gauge elbow connected to the box will decrease, and in the other elbow it will increase.

    Slide 14

    What parts does the pressure gauge consist of?

    A pressure gauge consists of a two-legged glass tube into which some liquid is poured. The liquid is installed in both elbows at the same level, since only atmospheric pressure acts on its surface in the vessel elbows.

    Slide 15

    Pressure gauge value

    Pressure gauges are used in all cases where it is necessary to know, control and regulate pressure. Pressure gauges are most often used in heat power engineering, chemical and petrochemical enterprises, and food industry enterprises.

  • Slide 16

    Test based on presentation material

    • What does a pressure gauge measure?
    • What kind of pressure gauge does not exist?
    • What does a general technical pressure gauge measure?
    • What are devices for measuring pressures greater or less than atmospheric pressure called?
    • How many elbows are there in a pressure gauge?

    • Pressure gauge

    A pressure gauge is a device that measures the pressure of a liquid or gas.

    Principle of operation

    The principle of operation of the pressure gauge is based on balancing the measured pressure by the force of elastic deformation of a tubular spring or a more sensitive two-plate membrane, one end of which is sealed in a holder, and the other is connected through a rod to a tribic-sector mechanism that converts the linear movement of the elastic sensing element into a circular movement of the indicating arrow. .

    Types of pressure gauges

    Depending on the design and sensitivity of the element, there are liquid, deadweight, and deformation pressure gauges (with a tubular spring or membrane). Pressure gauges are divided into accuracy classes: 0.15; 0.25; 0.4; 0.6; 1.0; 1.5; 2.5; 4.0 (the lower the number, the more accurate the device).

    Types of pressure gauges

    By purpose, pressure gauges can be divided into technical - general technical, electrical contact, special, recorder, railway, vibration-resistant (glycerin-filled), ship and reference (analog). General technical: designed for measuring liquids, gases and vapors that are not aggressive to copper alloys. Electrical contact: the design has special groups of electrical contacts (usually 2). One group of contacts corresponds to the minimum set pressure, the second group - to the maximum. Task values ​​may vary service personnel. The minimum pressure group can be included in electrical circuit position control or minimum pressure alarm. The same is true for the maximum pressure group. In some cases, both groups may be involved. Both the minimum and maximum groups can be set to the minimum or maximum (respectively) value of the pressure gauge scale and not be used. Electrical contact pressure gauges, as a rule, should not be used as instruments for taking readings due to the fact that the indicating arrow, when mechanically interacting with one of the contact groups, may not accurately indicate the pressure value - a noticeable error arises. A particularly popular device in this group can be called EKM 1U, although it has long been discontinued. To work in conditions of possible contamination with flammable gases, it is necessary to use electrical contact pressure gauges in explosion-proof design. Special: oxygen - must be degreased, since sometimes even slight contamination of the mechanism in contact with pure oxygen can lead to an explosion. Often produced in blue cases with O2 (oxygen) symbol on the dial; acetylene - copper alloys are not allowed in the manufacture of the measuring mechanism, since upon contact with acetylene there is a danger of the formation of explosive acetylene copper; ammonia - must be corrosion-resistant.

    Reference: having a higher accuracy class (0.15; 0.25; 0.4), these devices are used to test other pressure gauges. In most cases, such devices are installed on deadweight piston pressure gauges or some other installations capable of developing the required pressure. Ship pressure gauges are intended for use in river and marine fleets. Railway: intended for use in railway transport. Self-recording: pressure gauges in a housing, with a mechanism that allows you to reproduce the operating graph of the pressure gauge on chart paper.

    Application of pressure gauges Pressure gauges are used in all cases where it is necessary to know, control and regulate pressure. Most often, pressure gauges are used in heat power engineering, chemical and petrochemical enterprises, and food industry enterprises.

    Physics teacher of Municipal Educational Institution “Secondary School No. 1”, Ivanteevka Gagarina Marianna Sergeevna

    The purpose of the lesson:

    give an idea of ​​the design and operating principles of liquid and metal pressure gauges, consider their use in various fields.

    Educational:

    study the structure and principle of operation of open liquid and metal pressure gauges; teach how to use them;

    Educational:

    develop cognitive interest, communicative and experimental competencies of students;

    Educators:

    cultivate a friendly attitude towards participants in the educational process, an understanding of the need to take care of one’s health and acquire life skills.

    Test

    1.Which scientist proposed a method of measurement atmospheric pressure?

    2.What letter represents atmospheric pressure?

    Test

    4. What is the name of the device for measuring atmospheric pressure?

    5. What is the value of normal atmospheric pressure?

    Answers

    Lesson topic:

    Pressure gauges

    Pressure gauges are devices for measuring pressures greater or less than atmospheric pressure (from the Greek “manos” - rare, loose and “metreo” - I measure.

    Grebenshchikov V.E. PSM-21
    Measuring instruments
    pressure

    Content
    1.What is pressure? Kinds.
    2. Classification of measuring instruments
    pressure
    A. Two-pipe pressure and vacuum gauge
    b. Deadweight pressure gauges
    V. Differential pressure gauges
    g. Recording pressure gauges
    d. Pressure gauges precise measurements
    e. Digital pressure gauges
    and. Electric contact pressure gauges
    h. Micromanometers
    And. Pressure meters, draft pressure meters, draft meters
    j. Pressure transducers KRT5
    l. Pressure switches

    1.What is pressure? Kinds.

    Pressure - effective force located on the surface of the body, divided by
    area of ​​this surface. In the SI system it is measured in Pa (Pascals).
    Metrologists measure pressure in units of measurement - millibars, which
    equals 100 Pa.
    Absolute pressure is a value measured relative to a pressure equal to
    absolute zero. In other words, the pressure is relative to absolute
    vacuum.
    Barometric pressure is the absolute pressure of the earth's atmosphere.
    This type of pressure gets its name from the measuring device
    barometer, which is known to determine atmospheric pressure in
    a certain point in time at a certain temperature and at
    a certain altitude above sea level. Relative to this pressure
    excess pressure and vacuum are determined.
    Excessive pressure occurs if there is a positive
    the difference between the measured pressure and the barometric pressure. That is
    excess pressure is the amount by which the measured pressure is greater
    barometric A pressure gauge is used to measure this type of pressure.

    Vacuum or otherwise vacuum pressure is the value by which
    the measured pressure is less than barometric. If excess pressure
    is denoted in positive units, then vacuum in negative units.
    For example, a 40PC015V1A sensor capable of measuring vacuum has a range
    measured pressure from -103 to 0 kPa. Instruments capable of measuring this type
    pressure are called vacuum gauges.
    Differential pressure occurs when one pressure is compared
    relative to the other, and neither of them is equal to the barometric one.
    Excess pressure and vacuum are measured relative to barometric
    pressure. If we measure these quantities relative to any other
    quantities, then we get a differential one.

    2.Classification of pressure measuring instruments

    Two-pipe pressure and vacuum gauge
    Double-pipe pressure and vacuum gauges MN21 are designed
    for measuring excess, absolute pressure, and
    also pressure differences between liquids and gases.
    Operating principle and pressure and vacuum gauges
    two-pipe is based on the law of communicating
    vessels. The device is a curved
    U-shaped glass tube permanent
    section filled with working fluid.
    The liquid is a sensitive element,
    responsive to changes in pressure. For
    gas pressure measurements as a working
    liquids use water to measure
    liquid pressure - mercury. Under influence
    measured pressure changes height
    balancing column of liquid, such
    the measured pressure is determined by
    readings of the position of the working fluid level in
    one or two tubes.

    The instrument scale is a rectangular plate on which
    A uniform scale is applied, graduated in mm.
    Double-pipe pressure and vacuum gauges MN21 have 5 modifications,
    differing in measurement ranges, design and overall dimensions
    sizes. In pressure and vacuum gauges mod. 5, designed for
    measurements of low absolute and differential pressures,
    an inclined tube is used.

    Deadweight pressure gauges

    Deadweight piston pressure gauges are
    devices in which the measured pressure
    is balanced by the force created
    calibrated weights acting
    on a freely moving piston.
    The main part of the device is
    vertical column, in cylindrical
    the channel in which the piston is located.
    The most common pressure gauges are with
    unsealed piston. Between him and
    there is a small gap in the cylinder,
    the space under the piston is filled
    special oil, which is under
    pressure enters the gap and provides
    lubrication of rubbing surfaces. At
    pressure measurement to reduce friction
    between the cylinder and the piston the last
    driven by an electric motor.
    Pressure gauges of this type are characterized by high
    accuracy and wide measurement range
    (from 0.098 to 250 MPa). Deadweight piston
    pressure gauges have upper limits
    measurements 0.1; 0.6; 1; 2.5; 6; 10; 60; 100;
    250 MPa and accuracy classes 0.02, 0.03 or
    0.05. High accuracy of these devices
    requires good care behind them and
    strict adherence to the rules
    operation.

    MP-250 deadweight pressure gauge
    Overpressure gauge
    deadweight piston MP-250 class
    accuracy 0.05 (hereinafter according to
    text - pressure gauge) is intended
    for verification and calibration
    measuring instruments
    pressure (deformation
    pressure gauges, sensors,
    registrars, etc.). And
    for direct
    measurement of excess
    pressure in the connected
    systems.
    Specifications
    pressure gauges comply with GOST
    8291-83.
    The pressure gauge is designed for
    work at temperature
    ambient air from 10 to
    30 °C and relative
    humidity no more than 80%

    MVP-2.5 pressure-vacuum tester, deadweight piston (accuracy class 0.02)

    Pressure and vacuum gauge
    deadweight piston MVP-2.5 (in
    hereinafter referred to as pressure and vacuum gauge)
    accuracy class 0.02
    intended for verification
    exemplary deformation
    pressure gauges with upper
    measurement limits no more
    0.25 MPa (2.5 kgf/cm2) and
    exemplary deformation
    vacuum gauges, as well as for
    direct measurement
    excess pressure and
    vacuum.
    The pressure and vacuum gauge is designed
    for operation at temperatures
    environment from 10 to
    30°C and relative humidity
    no more than 80%.

    Differential pressure gauges

    Differential pressure gauge
    (differential manometer) is
    showing (arrow
    or digital) device
    differential measuring
    (difference) pressure. IN
    depending on what is being measured
    parameters are distinguished
    differential pressure gauges:
    changeover meters, flow meters and
    level gauges Beyond simple
    showing performance,
    differential pressure gauges can be
    signaling and
    self-peeping.

    Handheld Digital Differential Pressure Gauge
    series 477.
    ● For easy data download option
    USB contains cable and software
    security;
    ● Choice of nine
    English/Metric technical
    units;
    ● The memory stores 40 previous
    indications;
    ● Positive measurements,
    negative and differential
    pressure;
    ● Audible and visual emergency
    overpressure signals;
    ● Operates up to 100 hours from one
    9 volt batteries;
    Combines the features needed for
    pressure measurements quickly, easily and more accurately
    records data. Firstly, you can immediately
    choose from nine most widely used units
    pressure without wasting time and risking mistakes
    tedious conversion of units. Next, the function
    non-volatile memory allows you to save up to 40
    readings - convenient for HVAC technicians
    (heating, ventilation and air conditioning) and
    gives reading profiles air flow for channel with
    pitot tube. Models are FM certified with
    intrinsically safe for hazardous locations to Class 1, Div. 1,
    Group A, B, C, D, T4.
    When working in areas with poor lighting there is a function
    display backlight. She automatically
    switches off after 20 minutes to minimize
    battery discharge. Electronic zeroing made simple
    touching one key to completely reset
    any minimum pressure differences. HOLD key
    (hold) records the current pressure in order to
    determine the general situation when the readings
    fluctuate. We even turned on the emergency sound
    overpressure warning signal plus
    visual Emergency Signal in case
    the ambient noise level is too high to
    hear a beep. Sound signal Also
    confirms that the reading has been preserved, which excludes
    the need to pay attention to the display during
    measurements on the channel profile.
    A new option for the 477 series is the USB interface. IN
    combinations with the possibility of data recording in a series
    477 user can now quickly and conveniently download
    saved readings to any USB compatible
    device. Data manipulation can be done easily
    in numerous electronic processing devices
    text or spreadsheet programs. USB
    models are equipped with a USB cable and a CD with software
    provision.

    Differential U-shaped pressure gauges
    These inexpensive pressure gauges measure positive, negative and
    differential pressures. U-shaped pressure gauges combine obvious accuracy,
    which has a simple U-shaped tube, with the strength being rigid and durable
    plastic construction. The pressure gauge posts are made of flexible, durable transparent
    tubes with an outer diameter of 0.375".
    They can be easily cleaned.
    To ensure maximum color contrast behind the indicator tube
    there is a recess white. The scales are extruded on polystyrene, which has the shape
    keeping the gauge posts absolutely straight. Durable for clarity
    white scales have black divisions and numbers.
    A large number of models and characteristics,
    including versions with safety
    overpressure traps, options with
    full scale range from 8" to 36" for water and
    mercury All pressure gauges are suitable for full
    pressures up to 100 Pa - to determine speed and
    static pressures, leakage, efficiency
    fan and blower, filter resistance
    and gas pressure. The pressure gauge is ideal when
    Transportability and direct reading are required.
    Small divisions (scales) 1/10 inch water
    column (or 2 mm water column in metric
    units) are printed for better legibility
    black on a white scale. Easy to read,
    even from a distance, they are covered for durability
    acrylic. All models come with one bottle
    per ¾ ounce fluorescent concentrate
    green color with special wetting agent
    substance for W/M models (water/mercury) or
    ¾ ounce bottle of red measuring oil
    for D models.

    Differential U Shape Flexible Twist Gauge
    Convenient twist-up pressure gauge,
    measuring with laboratory precision.
    The pressure gauges correspond in accuracy to the most
    high-quality laboratory U-shaped pressure gauges – also for
    ease of carrying the pressure gauge U-shaped
    pressure gauges are rolled up to a compact size
    pressure gauge size and withstand
    quite rough handling of the U-shape
    pressure gauge.
    Simply unfold the pressure gauge and install the U-shaped pressure gauge to measure
    differential pressure. Magnetic
    U-shaped pressure gauge clamps securely
    hold the pressure gauge on any steel
    surfaces. Pressure gauge can be installed
    obliquely, securing one side with a nail.
    To start working with the pressure gauge, turn
    U-shaped pressure gauge connectors per one
    turnover When pressure is applied, it occurs
    upward displacement of the level in one shoulder by
    some value measured in inches and
    shift the level down by some
    a value measured in inches.
    Pressure gauges cover a wide range of pressures - from 4-0-4 inches to
    60-0-60 inches. Use these U-shaped pressure gauges to determine
    speed and static pressure, for leak detection, testing
    fans and blowers, calibration of control devices, testing
    gas pressure and many other applications. All models of U-shaped pressure gauges
    have flexible vinyl arms and a flexible steel scale calibrated to
    inches of water when using water and inches of mercury when
    use of mercury. Pressure gauges are suitable for measuring pulsating
    total pressure up to 50 Pa and vacuum not exceeding 20 C.

    Differential inclined
    pressed pressure gauges
    Pressed pressure gauges series
    Mark II are available as inclined type,
    and the type with vertical
    location of the meter.
    Curved located
    vertical pressure gauge tube
    Model 25 provides more
    wide ranges with lighter
    reading increments at low
    reading values. Model 25
    great for general use
    applications. Inclined model
    pressure gauge provides linear
    calibration and beauty
    resolution over the entire range.
    Inclined pressure gauge model
    ideal for measuring
    air speed and measurements in
    air filter. Both types
    pressure gauges are capable of measuring
    pressure higher and lower
    atmospheric, as well as for
    differential measurements
    pressure (pressure difference).

    Hospital patients who
    sensitive to dust or
    bacteria, require placement in
    carefully controlled blocks
    environment. Complex
    filtration systems are removed
    particles from incoming
    forced air. Pressure gauge
    differential pressure
    monitors pressure drop across
    filter system for
    determining the moment when
    maintenance required.
    Mark II pressure gauge measures
    positive pressure in
    room so that there is
    confidence in exceeding
    pressure above atmospheric and
    preventing intrusion
    unfiltered air when
    the door opens. If
    a double type reading is desirable,
    instead of Mark II maybe
    pressure gauge used
    differential pressure
    And to provide visual
    or audible warning about
    upcoming problems
    can be installed
    relays/pressure gauges.

    DM 3583M differential pressure gauge
    Designed for proportional
    converting pressure difference to output
    unified mutual signal
    inductance.
    Converters (differential pressure gauges) are used in
    control systems, automatic
    regulation and management of technological
    processes when measuring liquid flow,
    gas or steam by the pressure difference in the constrictions
    devices, differences between vacuum and
    excess pressure, liquid level according to
    hydrostatic column pressure,
    under atmospheric, excess or
    vacuum pressure.
    Transducers are designed to measure
    parameters of non-aggressive gases and liquids at
    ambient temperature from minus 30
    degrees to plus 50 degrees Celsius and
    relative humidity up to 95 percent.
    Converters are available with upper
    measurement limits corresponding to the following range:
    1.6; 2.5; 4.0; 6.3; 10; 16; 25 kPa (160; 250; 400;
    630; 1000; 1600; 2500 kgf/m2) 40; 63; 100; 160;
    250; 400; 630 kPa (0.4; 0.63; 1.0; 1.6; 2.5; 4.0;
    6.3 kgf/cm2).
    The lower limit of measurement is zero.
    Converters with upper rated
    measurement limits 1.6; 2.5; 4.0 kPa (160; 250;
    400 kgf/m2) are intended only for maximum
    permissible operating overpressure 16
    MPa (160 kgf/cm2)
    Converters with upper limits
    measurements 1.6 and 2.5 kPa (160 and 250 kgf/m2)
    are intended only for conversion to

    Bellows differential pressure gauge
    showing DSP-160M1
    To measure pressure drop on gas meters,
    gas filters, as well as other gas equipment.
    Industries: gas supply, heat power,
    chemical industry.
    Wednesday: natural gas, nitrogen, argon, air, and others
    non-aggressive gases.
    Operating principle: Differential manometer design
    consists of two parts - a bellows block and
    showing part.
    The operating principle is based on the use
    deformation of the elastic system (bellows,
    coil springs,
    torque tube) when exposed to
    measured pressure difference. Mechanism
    showing part assembled
    in a round case with a diameter of 160 mm and represents
    is a tribco-sector mechanism, on the axis of which
    installed
    indicating arrow. Differential pressure gauge scale
    uniform with a value of one division of 1 mbar (10 mm.
    water Art.).
    The differential pressure gauge can withstand an overload exceeding the maximum limit for 1 hour on the positive input side
    nominal pressure drop by 50%. The differential pressure gauge holds for 1 minute on the positive side or
    minus
    input exposure to pressure equal to the maximum permissible operating excess pressure. Easy to install
    differential pressure gauge. Insensitive to working environment pollution. In terms of resistance to temperature and
    ambient humidity differential pressure gauge
    It has Climatic performance U2 according to GOST 15150-69. According to the degree of protection from environmental influences
    The differential pressure gauge meets the requirements for IP55 performance (protected from dust and water) according to
    GOST 14254-96.
    The design provides for installation on a round post with a diameter of 40mm or on a bracket with bolt fastening
    M14x1.5. Full average service life of at least 12 years.

    Self-recording pressure gauges

    Intended for
    measurement and continuous
    records in time on
    disk diagram
    excessive and
    vacuum,
    differential
    liquid pressure and
    gaseous non-aggressive
    environments, incl. gaseous
    oxygen.
    Chart disk drive
    from an electric motor or from
    clock mechanism. Time
    one revolution of the diagram
    disk 24 hours. Execution according to
    Pressure records: single and
    two-note. Class
    accuracy: 1; 1.5. Working
    ambient temperature
    Wednesday: -10 to +600С.

    DM-2001 self-recording pressure gauge

    Recording pressure gauge DM-2001
    used to measure
    excess pressure of gaseous
    and liquid non-aggressive media in
    various industries
    industry and continuous
    records in time on disk
    diagram (diagram discs,
    registration number 2109). Sign up for
    chart disc is produced with
    using a writing unit brand UPS23/D1. The letter "D" means that
    The disk has been modified. Action
    pressure gauge DM2001 is based on
    balancing the measured
    pressure elastic deformation
    single-turn tubular spring,
    moving the free end
    which multiplying
    mechanism is converted into an angular
    moving the writing pen
    readings on the chart disc.
    The disk rotates with
    with help mechanical drive.

    Recording differential pressure gauge DSS-711-M1 (flow meter)

    Differential pressure gauges
    (differential pressure gauges) - flow meters
    bellows are intended for
    measuring the flow of liquids and
    gaseous media according to the method
    variable pressure drop in
    standard constriction devices.
    DSS-711-M1 - differential pressure gauge
    recorder with drive
    chart disk from
    electric motor. Diagrammatic
    discs of differential pressure gauges-flow meters with
    quadratic dependence uneven.

    Pressure gauges for precise measurements

    Pressure gauges for precise measurements
    (pressure and vacuum gauges, vacuum gauges) –
    MTIF, MVTIf, VTIf. Accuracy class -
    0.4; 0.6; 1.0. Intended for
    non-aggressive pressure measurements

    steam and gas, including oxygen and
    freon.
    Belong to deformation
    pressure gauges - their base is tubular
    Bourdon spring. Peculiarity
    production of standard pressure gauges
    (working standards) from conventional
    technical pressure gauges, consists in
    compliance with higher requirements,
    requirements for materials, technology
    manufacturing, pressure gauge design,
    providing more accurate
    adjustment. At the exemplary - reference
    pressure gauge is used tubular
    the spring is usually larger
    there are additional options
    adjusting the scale range and its
    uniformity. For the manufacture of
    exemplary sensitive elements
    pressure gauges use alloys with more
    high elasticity characteristics
    (for example, beryllium bronze).

    MPTI, VPTI, MVPTI class t.1, class t.0.6, class t.0.4

    Pressure gauges, vacuum gauges and
    pressure and vacuum gauges indicating
    for precise MPTI measurements,
    VPTI, MVPTI are intended for
    measurement of excess and
    vacuum pressure
    non-aggressive,
    non-crystallizing liquids,
    gas and steam, including
    oxygen and applications in the fields
    state
    metrological control and
    supervision (GMKiN) and
    state system
    industrial devices and
    automation equipment (GSP).

    MTPSd-100 ship pressure gauge

    Ship pressure gauges
    (ship) MTPSd-100OM2 are designed for
    measurement of excess
    fluid pressure
    (diesel fuel, oil,
    water, sea ​​water), gases and
    water vapor, temperature
    which at the sampling site
    there shouldn't be any pressure
    more than 60°C, in the ambient
    vapor-rich environment
    lubricating oil, diesel
    fuel and sea water.
    Devices can be manufactured
    for pressure measurement
    freons grades 12, 13. 22.
    142, 502 and oxygen.

    Digital pressure gauges Yokogawa MT210 / MT210F / MT220 Digital pressure gauges

    MT220 and MT210 Yokogawa are
    high-precision digital pressure gauges and
    used for checking instruments,
    measuring excess, absolute and
    pressure drop. Pressure gauge
    differential pressure allows
    measure both absolute, excess, and
    pressure drop. MT220 as opposed to MT210
    It has additional functions digital
    multimeter with an accuracy of 0.01% of the measured value
    values ​​and 24V DC output. current, which allows
    carry out verification and calibration
    pressure converters without involving
    other Yokogawa MT220 devices at the same time
    can immediately show deviations in readings
    calibrated sensor from the real value
    pressure. Digital pressure gauges have
    built-in memory for measured values,
    have a standard exchange interface with
    computer (RS232C or GP-IB) and can be
    additionally equipped with digital-analog
    output and output of the comparator. Thanks to
    it is possible to build
    automated documentation schemes and
    verification based on MT210 and MT220 devices.

    Electrical contact pressure gauges DM2005 signaling pressure gauge, explosion-proof.

    Designed to measure
    excess and vacuum
    pressures of various media in the range
    0-4 kgf/cm² and external control
    electrical circuits from
    direct signaling device
    actions.
    Medium being measured: liquid, steam, gas,
    including propane and butane. To order
    it is possible to design the device for
    measurements in liquid and
    oxygen gas.

    Micromanometers MMN 2400 micromanometer

    Multi-range micromanometer with
    inclined tube MMn-2400
    designed to measure
    excess vacuum
    pressure and pressure difference
    non-aggressive to steel, brass and
    polyethylene gases up to
    240 kgf/cm2 at static
    pressure no more than 1000 kgf/m2
    Operating principle: measurable
    pressure balances
    working column pressure
    liquid that forms in
    measuring tube.
    As a working fluid in
    MMn-2400 uses ethyl
    technical alcohol. Scale
    applied to the bottle
    measuring tube L=300 mm.
    Scope of application: control
    industrial ventilation
    premises, environmental
    emission control of various
    production, technological
    control of gas and dust flows,
    aerodynamic research.

    Pressure meters, draft pressure meters, draft meters Multi-limit pressure meters ADN/ADR

    ADN meter (ADR) –
    small-sized product
    which combines functions
    primary sensor and secondary
    device. The meter is built on
    modern element base with
    using technology
    laser calibration
    and microprocessing
    measurement results.
    Applications: as pressure meters
    and thrust gauges in automation
    protection of gas boilers and burners,
    as converters
    pressure in the circuits
    power regulation and
    vacuum, for indication
    water level in the boiler drum and
    for position control
    flaps Acceptable limit
    main error,
    expressed as a percentage of
    range of instrument readings, not
    exceeds 2.5%.

    Pressure converters KRT5
    Application area:
    Heating points, heat metering units,
    CHP, distribution networks (water, steam, gas and
    etc.), pumping stations with adjustable
    electric drive, control systems and
    regulation technological processes,
    oil and gas pumping stations, enterprises
    food, chemical and gas industries.
    Purpose: for measurement and continuous
    overpressure conversion
    (pressure) neutral to titanium and
    stainless steel environments
    (gas, steam, liquid) into a unified
    output signal direct current or
    voltage.
    Used as an input device
    in secondary equipment of systems
    automatic control, regulation and
    technology management
    processes, testing equipment
    (hydrotesters, etc.), dispatching,
    telemechanical information-measuring complexes,
    adjustable asynchronous thyristor
    electric drives, etc.

    Pressure switches

    Purpose: for control and
    on/off control
    pressure of liquid and gaseous
    media in refrigeration units,
    used on ships,
    railway and road
    transport, as well as in
    stationary installations and others
    systems and devices.
    Controlled Environments:
    freons, air, oils and others
    non-aggressive environments. For
    devices DEM102-1-01A, DEM1022-05A controlled environment
    It could be ammonia.



    Contents Electric pressure gauge Differential pressure gauge of the “ring balance” type Corrosion-resistant pressure sensors Pressure sensors 3051S Pressure sensors 1151 Pressure sensor METRAN -55- DMP 331 Pressure sensor METRAN -55- LMK 351 Multifunctional pressure sensor Metran -55- DS




    Units of pressure The unit of force is Newton, and the unit of area is square meter. To measure pressure, Pascal is taken, which has the following relationship with units of force and area - Pa = 1 N / m 2. Pascal derivatives - kiloPascal (1 kPa), megaPascal (1 MPa)


    Pressure units According to technical system MGSS units force is measured in kilograms force. The relationship with Newtons for this unit is 1 kgf = 9.8 N. The unit of pressure measurement in the MGSS system is designated as kgf / m 2 or kgf / cm 2 and is called the metric or technical atmosphere. It is designated “at”, and if it measures excess pressure, the designation “ati” is used. 1 MPa = 10.1972 kgf/cm2.


    Units of pressure measurement According to the physical system of units GHS, 1 dyne is taken as a unit of force. The relationship with Newtons is 1 dyne = N. The unit of pressure in this system, or 1 dyne / cm 2, is called bar. 1 bar = 106 dynes/cm2 1 MPa = 10 bar.


    Units of measurement of pressure: physical or normal atmosphere - the amount of atmospheric pressure on the surface of the Earth at the level of the World Ocean. It is also a value equivalent to a balancing column of 760 mmHg. Art. Ratio between normal atmosphere and megaPascal: 1 MPa = 9.8692 atm.




    Types of atmospheric pressure - atmospheric (barometric), i.e. pressure of the air column of the earth's atmosphere; excess - excess (gauge), i.e. excess pressure above atmospheric; - absolute - absolute (total), i.e. the sum of atmospheric and excess pressure.






    Classification of instruments according to the type of pressure being measured. Pressure and vacuum gauges - for measuring excess pressure and vacuum (vacuum). Pressure meters (devices for measuring small excess pressures (up to 40 kPa). Draft meters (micromanometers) – devices for measuring small vacuums (with an upper measurement limit of no more than 40 kPa).


    Classification of instruments according to the type of pressure being measured. Thrust pressure gauges (micromanometers) are instruments for measuring low pressures and vacuums (with a measurement range from –20 to +20 kP). Differential pressure gauges are instruments for measuring the difference between two pressures, neither of which is ambient pressure.


    Classification of devices according to the principle of operation: liquid liquid (based on balancing pressure with a column of liquid); piston piston (the measured pressure is balanced by the external force acting on the piston); spring spring (pressure is measured by the amount of deformation of the elastic element); electrical electrical (based on the conversion of pressure into some electrical quantity).
















    P 2 the liquid on the left side will go down, and on the right it will rise" title=" Differential pressure gauge of the “ring scales” type. When p 1 = p 2 the liquid level in both parts of the ring is the same, and the center of gravity of the load is at vertical axis passing through the center of the ring. When p 1 > p 2 the liquid on the left side will fall, and on the right it will rise" class="link_thumb"> 23 Differential pressure gauge of the “ring scales” type When p 1 = p 2 the liquid level in both parts of the ring is the same, and the center of gravity of the load is on a vertical axis passing through the center of the ring. When p 1 > p 2 the liquid on the left side will fall, and on the right it will rise. The force created by the pressure difference on the partition causes a moment tending to rotate the ring clockwise. p 2 the liquid on the left side will fall, and on the right will rise."> p 2 the liquid on the left side will fall, and on the right will rise. The force created by the action of the pressure difference on the partition causes a moment tending to rotate the ring clockwise."> p 2 the liquid in the left part will fall, and in the right it will rise" title=" Differential pressure gauge of the “ring scales” type. When p 1 = p 2, the liquid level in both parts of the ring is the same, and the center of gravity of the load is on the vertical axis passing through the center rings. When p 1 > p 2, the liquid on the left side will fall, and on the right it will rise"> title="Differential pressure gauge of the “ring scales” type When p 1 = p 2 the liquid level in both parts of the ring is the same, and the center of gravity of the load is on a vertical axis passing through the center of the ring. When p 1 > p 2 the liquid on the left side will fall, and on the right it will rise"> !}




    Corrosion-resistant pressure sensors Measured media – aggressive media with high content hydrogen sulfide, petroleum products, crude oil and others, in relation to which the sensor materials in contact with the measured medium are corrosion resistant. Basic measurement error up to ±0.15% of range.


    Corrosion-resistant pressure sensors Corrosion-resistant intelligent pressure sensors Metran-49 are designed for operation in automatic control, regulation, process control systems and provide continuous conversion to a unified analog current output signal and / or digital signal in the HART protocol standard.




    3051S Super Module Pressure Transmitters – latest development XXI century, with minimal additional errors caused by the influence of changes in ambient temperature and static pressure. Used for high-precision technological processes and commercial accounting of expensive products.






    Medium being measured: gas, liquids (including aggressive ones), steam. Ranges of upper measurement limits, kPa: - absolute pressure 6.22–6895; - excess pressure 0.18–41369; - pressure drop 0.18–895; - hydrostatic pressure (level) 6.2–689.5. The limit of permissible basic reduced error is ±0.075%.


    Pressure sensors 1151 High-precision intelligent pressure sensors of the 1151 series of ordinary and explosion-proof versions are designed for accurate measurements of absolute, gauge pressure, pressure difference of gases, vapors (including saturated), liquids, level of liquids (including heated, chemically active ) and remote transmission of output signals to automatic monitoring, regulation and control systems of technological processes.






    Pressure sensor METRAN -55- DMP 331 Advantages: - durable and reliable design for harsh operating conditions; - the sensor body is made of stainless steel; - various options electrical and mechanical connections; - corrosion - resistant metal case for field conditions.


    40 kPa). additionally: from –20 to +50 0 C; from –40 to +70 0 C." title=" Pressure sensor METRAN -55- DMP 331 Temperature of the measured medium: from –40 to +125 0 C. Ambient temperature: from 0 to +50 0 C ( URL up to 40 kPa); from 0 to +70 0 C (URL > 40 kPa). additionally: from –20 to +50 0 C; from –40 to +70 0 C." class="link_thumb"> 36 !} Pressure sensor METRAN -55- DMP 331 Temperature of the measured medium: from –40 to C. Ambient temperature: from 0 to C (URV up to 40 kPa); from 0 to C (URL > 40 kPa). additionally: from –20 to C; from –40 to C. 40 kPa). additionally: from –20 to +50 0 C; from –40 to +70 0 C."> 40 kPa). additionally: from –20 to +50 0 C; from –40 to +70 0 C."> 40 kPa). additionally: from –20 to +50 0 C; from –40 to +70 0 C." title=" Pressure sensor METRAN -55- DMP 331 Temperature of the measured medium: from –40 to +125 0 C. Ambient temperature: from 0 to +50 0 C ( URL up to 40 kPa); from 0 to +70 0 C (URL > 40 kPa). additionally: from –20 to +50 0 C; from –40 to +70 0 C."> title="Pressure sensor METRAN -55- DMP 331 Temperature of the measured medium: from –40 to +125 0 C. Ambient temperature: from 0 to +50 0 C (URV up to 40 kPa); from 0 to +70 0 C (URL > 40 kPa). additionally: from –20 to +50 0 C; from –40 to +70 0 C."> !}






    Pressure sensor METRAN -55- LMK 351 Distinctive feature ceramic sensor is its resistance to aggressive environments. Temperature of the measured medium: from –25 to C. Ambient temperature: from –25 to C.


    Multifunctional pressure sensor Metran -55-DS Measured media: liquid, steam, gas. Range of measured pressures: minimum – 0–4 kPa (excess), 0–10 kPa (absolute), maximum – 0–60 MPa. Measurement error: ±0.35% URL (standard) (URL > 40 kPa). 40 kPa).">


    Multifunctional pressure sensor Metran -55- DS Output signals: 4–20 mA, 0–10 V. Temperature of the measured medium: from –25 to +125 º C. Ambient temperature: from 0 to 50 º C (URL up to 40 kPa) ; from 0 to 70 º C (URL > 40 kPa). 40 kPa)."> 40 kPa)."> 40 kPa)." title="Multifunctional pressure sensor Metran -55- DS Output signals: 4–20 mA, 0–10 V. Temperature of the measured medium: from –25 to +125 º C. Ambient temperature: from 0 to 50 º C (URL up to 40 kPa), from 0 to 70 º C (URL > 40 kPa)."> title="Multifunctional pressure sensor Metran -55- DS Output signals: 4–20 mA, 0–10 V. Temperature of the measured medium: from –25 to +125 º C. Ambient temperature: from 0 to 50 º C (URL up to 40 kPa) ; from 0 to 70 º C (URL > 40 kPa)."> !}


    Multifunctional pressure sensor Metran -55- DS Multifunctional pressure sensor Metran -55- DS 200 is designed to work in all types of environments that are non-aggressive to stainless steel, and is good combination several devices: - precision pressure sensor; - programmable pressure switch with relay output; - digital display.




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