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Absolute pressure transmitters

time£º2019-07-26 16:39    source£ºoem pressure sensor

 Absolute pressure transducer

Absolute pressure transducer

Absolute pressure transmitter

Absolute Pressure Transmitter, also known as Absolute Pressure Transmitter, is a new series of products for vacuum measurement and control. It completely solves the problem of difficult vacuum measurement. It is widely used in pharmaceuticals, medical equipment, aerospace, scientific research, leak detection, automation equipment. Supporting areas.


High accuracy, good stability, two-wire input (special four-wire system);

Solid components, plug-in printed circuit board; small size, light weight, strong anti-vibration;

Range, zero external continuously adjustable; positive migration up to 500%, negative migration up to 600%

Damping can be adjusted too well; one-way overload protection is good;

No mechanical moving parts, less maintenance workload; complete series of uniform structures, strong interchangeability of parts and components;

The contact material of the diaphragm material can be selected; (316L, TAN, HAS-C, MONEL and other corrosion-resistant materials)

Explosion-proof structure, use around the clock; Smart HART fieldbus protocol

Technical Parameters

Use object: liquid, gas and steam

Measuring range: 0¡«0.1Kpa to 0¡«40Mpa

Output signal: 4¡«20mA DC

Power supply: 12 ~ 45VDC, usually 24V power supply

Live display: pointer type 0 to 100% scale display, LED digital display, LCD liquid crystal display optional

Explosion-proof grade: flameproof dIIBT4, intrinsically safe iaIICT6

Accuracy: ±0.2%, ±0.25%, ±0.5%

Stability: Absolute value of basic error that does not exceed the maximum range within six months

Isolation diaphragm: 316 stainless steel, Hastelloy C-276, Monel or Bile

Exhaust/Drain Valves: 316 Stainless Steel, Hastelloy C, Monel

Flanges and fittings: 316 stainless steel, Hastelloy C, Monel

Contact medium O-ring: nitrile rubber, fluororubber

Filling liquid: silicone oil or inert oil

Bolt: 316L stainless steel

Shell material: low copper aluminum alloy

Pressure connection: flange, NPT1/4, center distance 54mm; joint NPT1/2 or M20 x 1.5 male ball conical sealing, center distance 50.8,54,57.2mm with joint (NPT taper thread meets GB/ T12716-91)

Signal connection hole: G1/2

Technical performance and parameters

Output signal: 2-wire 4-20mA DC

Two-wire 4-20mA DC signal superimposed on digital signal (smart)

Power supply: 12 ~ 45VDC

Power Effect: <0.005%/V

Load effect: No load effect when the power supply is stable.

Measurement accuracy: ±0.2% of the calibration range, ±0.25%, ±0.5%

(The standard accuracy is ±0.5%. If you choose other accuracy, please specify when ordering.)

Migration characteristics: maximum positive migration 500%

Maximum negative migration 600%


The absolute value of negative migration is not greater than one engineering atmospheric pressure.

The upper or lower absolute value after migration should not exceed the upper limit of the maximum measurement range.

Absolute pressure transmitters cannot be negatively migrated.

Damping: Usually adjustable between 0.2 and 1.67 seconds. When filling with inert liquid or with a remote transmission device, the time constant will increase.

Start-up time: <2 seconds without warm-up

Working environment: Ambient temperature: -29 to 93°C (analog amplifier)

-29 to 65°C (with display meter)

Humidity: 0 to 95%

Protective features: IP65

Explosion-proof type: Flameproof ExdIIBT4

Intrinsically safe ExiaIICT4

Static pressure effect: Zero error: ±0.5% of the maximum range limit, corrected by zeroing at 32MPa for pipe pressure.

Electromagnetic radiation effects: 0.05% maximum range value, acceptance of radiation frequency 27 to 500 MHz, test field strength 3V/m.

Vibration effect: ±0.05%/g in 200Hz vibration in any direction.

Mounting position: The diaphragm is not mounted vertically and may produce a zero error of less than 0.24 kPa, but it can be eliminated by zeroing.


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