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HM27 Vacuum / Absolute Pressure Transducer


HM27 series of vacuum / absolute pressure transducer is a new series of product specially used for vacuum measuring control released in China by German HELM, which fully has solved the problem of difficult vacuum measurement. This series of product has three variants i.e. HM27G negative pressure transducer, HM27A absolute pressure transducer, HM27CA capacitor thin – membrane absolute pressure transducer, which has widely been used for such fields as pharmaceutical, medical equipment, airspace and aerospace, scientific research, leakage detection, accessories of automation equipment.
HM27G negative pressure transducer adopts HELM mono – crystalline silicon thick – membrane sensor, provided with high – accuracy signal processing circuit, with performance stability and reliability, which has solved such disadvantages of domestic diffused silicon – type negative vacuum product as unstable signal and short service life. The normal ranges are 0 ~ 100KPa and 0 ~ 50KPa etc.



HM27A negative pressure transducer adopts such new high technologies of German HELM as advanced absolute pressure chip, temperature automatic compensation, and normalized circuit commissioning etc. to expand the absolute pressure range to 5KPa, as a minimal, and to greatly enhance the overall accuracy of the product. This variant features advanced technology, superior performance, reliable quality, small dimensions. It features more advantages and high ratio of performance to cost comparing with the same type of domestic absolute pressure product.
HM27CA capacitor thin – membrane absolute pressure transducer is a vacuum pressure gauge made in China through introduction of capacitor thin – membrane from German HELM and internationally advanced calibration and production equipment. This product adopts the capacitor capacity changing principle to work, of which minimum scale may be up to 0.02MPa ~ 200MPa of absolute pressure, without influenced by the category and composite of the medium to be detected when detecting, with output of standard electrical signal, may be remote transferring, easily intellectual control by micro – processor. It is ideal for measurement of low vacuum pressure.

Technical Data

Medium to be measured

The gas or liquid, and compatible with 316 stainless steel

Type of pressure

Negative gauge pressure (G),  silicon – type absolute pressure (A), capacitor thin – membrane absolute pressure (CA)

Overloading capacity

Two times for negative gauge pressure, several dozens to several hundred times for micro - scale absolute pressure

Measuring range

Negative gauge pressure: 0 ~ 5KPa…-_50KPa…-100Kpa
Silicon – type absolute pressure: 0 ~ 5KPa…10KPa…20KPa0 ~ 100KPa…200KPa…1Mpa
Capacitor thin – membrane absolute pressure: 0.02Pa ~ 200Pa. 1Pa ~ 1KPa

Overall accuracy
Non - linear, repeatability, lagging

 ± 0.1% FS

 ± 0.25% FS

 ± 0.5% FS

Long – term stability

Typical:  ± 0.1% FS / year

Maximum:  ± 0.1% FS / year

Range of operating temperature


Range of Compensating temperature



Ambient temperature



Zero point temperature drifting

Typical:  ± 0.01% FS / ℃

Typical:  ± 0.15% FS / ℃

Sensitivity temperature drifting

Typical:  ± 0.01% FS / ℃

Typical:  ± 0.15% FS / ℃

Range of power supplying

12 ~ 36V DC ( generally 24V DC)

Signal output

4~20mA / 1-5V DC / 0~5V DC

Load resistance

≤(U - 12) / 0.02Ω

Enclosure protection degree

Plug type (IP65); cable type (IP67)

Safe explosion – proof

Ex ia II CT5

Tolerance of vibration

≤ ± 0.01% FS(Axles X, Y, and Z, 200Hz / g)


Infinite small (theoretical), 1 / 100000 (general)

Response time (10% ~ 90%)



• • • Features of Product • • •
☆ Fully provided with German HELL made high – accuracy sensing elements, with maximum accuracy up to 0.1% FS
☆ Stable and reliable performance, may be continuously operated for a long time, with good long – term stability
☆ May apply to measure corrosive medium under special requirements
☆ Strong overloading immunity
☆ Fast response
☆ May be used for hazardous site, with intrinsically safe type Ex ia II CT5
☆ Structural diversification, design may be customized at the customer’s special requirements.


Vacuum / Absolute Pressure Transducer


Guideline of Selection

Vacuum / Absolute Pressure Transducer


Type of pressure

Gauge pressure (G, may not be indicated); absolute pressure (A), capacitor thin – membrane absolute pressure (CA)




Measuring Range



0 ~ X KPa or 0 ~ X MPa







Overall accuracy (linear + repeatability + lagging)







 ± 0.5% FS







 ± 0.25% FS







 ± 0.1% FS









Signal Output (Standard power supply of energization









4 ~ 20mA (12 ~ 36V DC)









1 ~ 5V DC (12 ~ 36V DC)









0 ~ 5V DC (12 ~ 36V DC)









0.5 ~ 4.5V DC (12 ~ 36V DC)











Additional functions











M20 x 1.5 external thread











G 1 / 4 external thread











Clamped type






















Cable type (IP67, 2m)











Socket type (IP65, DIN 43650)











Airspace and aerospace plug











Flushed membrane type











Intrinsically safe explosion - proof type Ex ia II CT5













HM27   A( 0 ~ 10KPa)


— 1

— A1

— F1

— W2 Vacuum / Absolute Pressure Transducer

Tips of Selection

  1. The medium to be measured shall be compatible with the material contacting with the product.
  2. The code E, an additional functional code for selection, and intrinsically safe explosion-proof Ex ia II CT5 must be power supplied via safety barrier.
  3. Please contact us in case of the other special requirements and clearly indicate them when placing an order.


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