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WA18 Diezoresistive Silicon Oilless Pressure Sensor
  • WA18 Diezoresistive Silicon Oilless Pressure Sensor

WA18 Diezoresistive Silicon Oilless Pressure Sensor

Details

Introduction

    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.

 

Applications

Automation control  

Pressure instruments

Level measurement

Pressure transmitters

 

Features:

For measuring non-corrosive gas and liquid

Simple structure in low cost

Suitable for small and medium pressure (0-40Kpa…2.5Mpa)

Compensation temperature 0-70℃

Typical output: 0-100mV

Ventilating Gauge pressure (G)

 

 Technical Parameters    Excitation voltage 10VDC, preheat for 10 minutes under 25

Parameters

Min.

Typical

Max.

Accuracy(%FS)




Non-
Linearity
1

40Kpa


±0.20

±0.30

>40Kpa


±0.10

±0.20

Hysteresis


±0.05

±0.1

Repeatability


±0.05

±0.1

Output(mV)




Zero

-5

0

5

Span(FS)

95

100

105

Temp. characters




 Operation Temp.(℃)3

-40


125

Compensation Temp(℃)

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

0-40Kpa…2.5Mpa

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)

※Notes:      

1. Least square method fits straight line.      

2. Pressures to senor circulate from min. to max. span (positive stroke) and max. span to min. (negative stroke) under working pressure range, testing output discrepancy between positive and negative strokes within working pressure range.

3. Same as the second testing method, sensors are circularly tested under positive and negative stroke pressure for three times;

4. Comparing the outputs within compensation temperature range with that in 25°C    

5. Checking discrepancy in temperature circulation of -40 to +125℃ under zero output

6. Increase load resistance to reduce measurement errors;      

7. Between case and sensing element.


  • Company Name:Hefei WNK Smart Technology Co., Ltd
  • Add:4/F,Bldg #6, No.168, Xiangzhang Road, High-tech District, 230088, Hefei, Anhui province, China
  • Contacts:Ms. Echo Chen
  • Mob:+86-15956503046
  • Tel:
    +86-551-6536 9569
  • Email:echo@wnksensor.com