Diffused Silicon Oilless Pressure Sensor with Ceramic Housing

Model NO.
Wiring Type
Measuring Medium
Liquid and Gas
IP Rating
Model No.
Pressure Range
Typical Output
Media Range
Non-Corrosive Gas and Liquid
Pressure Reference
Compensation Temperature
Place of Origin
Heifei, Anhui, China
ceramic housing
Hefei, Anhui Province, China
HS Code
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Hefei WNK Smart Technology Co., Ltd. Diamond / Audited Supplier
WA18 Diffused Silicon Oilless Pressure Sensor      

WA18 series is MEMS technology based piezoresistive silicon sensor. It uses ceramic housing without isolation diaphram and silicon oil. WA18 is different with tranditonal diffused silicon diaphram-free sensors: pressure media touches directly with the back of pressure chip (the side without circuit), ensuring durability and long-term stability of the sensor. It is a kind of low cost and high performance OEM pressure measuring sensor designed for clear and non-corrosive gas and liquid.
Every sensor was strictly temperature compensated for both zero and span before shipment to ensure measurement accuracy in complex environment.

FeaturesWA18 Diffused Silicon Oilless Pressure Sensor    

1. For measuring non-corrosive gas and liquid
2. Simple structure in low cost
3. Suitable for small and medium pressure (0-40Kpa2.5Mpa)
4. Compensation temperature 0-70ºC
5. Typical output: 0-100mV
6. Ventilating Gauge pressure (G)


Technical Parameters under Constant Voltage (excitation voltage 10VDC, preheat 10mins under 25ºC)

Parameters Min. Typical Max.
40Kpa   ±0.20 ±0.30
>40Kpa   ±0.10 ±0.20
Hysteresis   ±0.05 ±0.1
Repeatability   ±0.05 ±0.1
Zero -5 0 5
Span(FS) 95 100 105
Temp. characters      
 Operation Temp.(ºC)3 -40   125
 Compensation Temp(ºC) 0   70
Zero Temp.error(%FS)4 -0.75 ±0.5 0.75
Span Temp. error(%FS)4 -0.75 ±0.5 0.75
Thermal hysteresis(%FS)   0.1  
Long term Stability      
   Zero (±%FS annual)   0.1  
   Span (±%FS annual)   0.1  
Supply Voltage   10VDC 14VDC
Input Resistance 6kΩ 8kΩ 10kΩ
Output Resistance 2.5kΩ 3kΩ 3.7kΩ
Load Resistance5 5MΩ    
Insulation Resistance(50V)6 50MΩ    
Pressure Range 0-40Kpa2.5Mpa
Pressure Overload 2X Rated pressure or 3.5Mpa (take the smaller)
Pressure Breakdown 1.5X Rated pressure or 4Mpa (take the smaller)
Pressure Media Clear gas and clear non-corrosive liquid compatible with ceramic, silicon, glass, Silica( measuring range smaller than1Mpa)/ epoxy resin adhesive (measuring range higher than 1Mpa)


1. Best fit straight line.
2. Measured at vacuum for absolute (A), ambient for gage (G).
3. Maximum temperature range for product with standard cable is -20°C to +105°C.
4. Over the compensated temperature range with respect to 25°C.
5. Load resistance to reduce measurement errors due to output loading.
6. Between case and sensing element.

Dimensions - WA18 Diffused Silicon Oilless Pressure Sensor    

Why choose us?
1. We are professional manufacturer with own R&D and sales team, with more than 12 years producing experience in transmitters & sensors.
2. We have strict quality control system, each set product we do temperature compensation and aging test before shipment, so the quality is guaranteed.

7~15 days after order confirmed