As a new series product specially used for vacuum measurement and control, AP28 Vacuum/Absolute Pressure Transducer has completely solved the problem of difficult vacuum measurement. This series product has three specifications, i.e. AP28G negative pressure transducer, AP28A absolute pressure transducer and AP28CA capacitor thin-film absolute pressure transducer, which have widely been used in such fields as pharmaceutical, medical equipment, airspace and aerospace, scientific research, leakage detection and completed automation equipment fields.

By use of a mono-crystalline silicon thick–film sensor, AP28G negative pressure transducer is equipped with a high-accuracy signal processing circuit, with stable and reliable performance, which has solved such disadvantages of domestic diffused silicon-type negative pressure vacuum products as unstable signal and short service life. Normal ranges include 0 ~ 100KPa and 0 ~ 50KPa, etc..

AP28A absolute pressure transducer adopts such advanced foreign new high technologies as absolute pressure chips, temperature automatic compensation, and normalized circuit debugging etc., to expand the absolute pressure range to 5KPa at the minimum, and to greatly enhance the overall accuracy of the product. Characterized by advanced technology, superior performance, reliable quality and small volume, this product has quite obvious advantages in high cost performance by comparison with domestic similar absolute pressure products.


* Fully provided with foreign high- accuracy sensing elements, with the maximum accuracy of up to 0.1% FS
* Continuously operable for a long time, with good long- term stability
* Applicable for measuring corrosive medium according to special requirements
* Strong overloading resistibility.Fast response. Stable and reliable performance
* Applicable for hazardous areas, with intrinsically safe explosion-proof type Ex ia II CT5
* With structural diversification, the product can be designed in an individualized manner as per customers’ special requirements


AP28CA capacitor thin-membrane absolute pressure transducer is a vacuum pressure gauge made in China through the introduction of foreign capacitor thin-film gauge technology and internationally advanced calibration equipment. This product works by the capacitance changing principle. Its minimum range may be up to 0.02MPa ~ 200MPa absolute pressure, and its detection won’t be influenced by the type and component of the medium to be detected. Its output of standard electric signals can be remotely transmitted, to facilitate intelligent control of microprocessors. Therefore, it is ideal for the measurement of low vacuum pressure.

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Measuring media The gas or liquid compatible with Ceramic or 316 stainless steel
Pressure type Negative gauge pressure (G), Silicon- type absolute pressure (A), Capacitor thin-film absolute pressure (CA)
Overload capacity 2 times at negative gauge pressure; 10 times to one hundred times at micro-range absolute pressure
Measuring range Negative gauge pressure: 0~-5KPa ..-50KPa…-100KPa
Silicon-type absolute pressure: 0~5KPa…..10KPa …20KPa…100KPa…200KPa…1MPa
Capacitor thin-film absolute pressure: 0.02Pa~200Pa、1Pa~1KPa customized
Overall accuracy

(nonlinearity + repeatability+ hysteresis)

±0.1%FS ±0.25%FS ±0.5%FS
Long-term stability Typical:±0.1%FS/ year Maximum:±0.15%FS/year
Zero temperature drift Typical:±0.01%FS/℃ Maximum:±0.15%FS/℃
Sensitivity temperature drift Typical:±0.01%FS/℃ Maximum:±0.15%FS/℃
Range of operating temperature -20~ 80℃
Range of compensation temperature  -10 ~ 60℃
Ambient temperature -20 ~ 80℃ –
Range of power supply 12~36VDC(generally 24VDC)
Signal output 4~20mA/1~5VDC/0~5VDC
Load resistance ≤(U-12)/0.02  Ω
Resolution Infinitely small (theoretical),,1/100000(normal)
Enclosure protection class Plug type(IP65); cable type (IP67)
Safety and explosion protection Ex iaⅡ CT5
Vibration error ≤±0.01%FS(Axes X, Y and Z, 200Hz/g)
Response time ≤2 ms
AP28 Vacuum/absolute pressure transducers
Pressure type Negative gauge pressure (G)
Silicon- type absolute pressure (A)
Capacitor thin-film absolute pressure (CA)
Measuring range 0~X KPa or 0~X Mpa
Code Overall accuracy (linearity + repeatability+ hysteresis)
1 ±0.5%FS
2 ±0.25%FS
3 ±0.1%FS
Code Signal Output
A1 4~20mA
V1 1~5V DC
V2 0~5V DC
V3 0~10V DC (24V DC)
Code Additional functions
F1 M20x1.5 external thread
F2 G1/4 external thread
F3 Clamped type
F0 Special
W1 Cable type (IP67,2m)
W2 Socket type (IP65,DIN43650)
W3 Aviation plug
P Flush-diaphragm type
E Intrinsically safe explosion-proof type Ex iaIICT6
AP28A(0~10KPa)—1 —A1 —F1 —W2                 Vacuum/Absolute Pressure Transducer

Tips for Type Selection:

1. The medium to be measured shall be compatible with the material contacting with the product.
2. As an additional function code for type selection, the code “E” for intrinsically safe explosion-proof type Ex iaIICT6 denotes that power source must be supplied via safety barrier.
3. For other special requirements, please discuss with us and clearly indicate them in the order.




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