Model: WPCK81
Detection principle: Piezoresistive
Output signal: 4-20mA; RS485
Resolution and accuracy: ±0.5%FS(Range>1m); ±1%FS(Range=1m)
Response time: ≤1ms
Pressure Range: 0~1m…5m…200mH₂O
Working Temperature: -20℃~85℃
Diaphragm material: SS 316L

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The WPCK81 liquid level transmitter consists of a high-performance diffusion silicon piezoresistive pressure sensor as the measuring element, which accurately measures the static pressure of the liquid proportional to the depth of the liquid level. The internal dedicated integrated circuit converts the sensor millivolt signal into a standard (current or voltage) signal output, establishing a linear correspondence between the output signal and the depth of the liquid, and achieving measurement of the depth of the liquid. The product has high accuracy and small size. It can be directly put into the liquid to measure the liquid height from the end of the transmitter to the liquid level, making it convenient to use. Suitable for liquid level measurement and control in the fields of petroleum, chemical engineering, power plants, urban water supply, and hydrological exploration.


  • Static liquid level
  • Liquid tank
  • Fire water pool
  • Water wells
  • Rivers
  • Seawater
  • Lakes


  • Stainless steel structure, multi thread structure
  • Wide temperature compensation-10~+70℃
  • Multi output methods
  • Excellent anti-interference ability
  • High reliability
  • Hi Accuracy
  • Low consumption


BasicParameter Index
Detection range 0~1m…5m…200mH₂O  
Output 4-20mA; RS485  
Accuracy ±0.5%FS(Range>1m); ±1%FS(Range=1m)  
Temperature Drift 35kPa:±2%FS(0℃~60℃) Others:±1.5%FS(-20℃~85)  
Working Temperature -20℃~85℃  
Environment Temperature -20℃~85℃  
Storage Temperature -40℃~125℃  
Response Time ≤1ms  
Lifespan ≥1×106Pressure Cycle  
Vibration 20g(20~5000HZ)  
Shock 100g(11ms)  
Insulation 200MΩ/250VDC  
Long term Stability ±0.2%FS/Year  
Media Compatibility Various media compatible with 304 stainless steel  
Protection Level IP68  
Cable Material Polyurethane 1m Cable in default

* The description and specifications might be changed without notice. Please contact us for the latest information before placing orders.

Technical Support:

Customized technical design and function, LOGO and package are available without extra charge (including molding fee) for mass volume.

The sensors don't have sleeping mode. It can be set in program if needed.

All Winsen products go through strict inspections and tests to make sure they are 100% qualified before shipping out.

The sensor has been fully tested (not calibrated) before leaving the factory. However, after transportation and storage, the environment conditions change, and the surface of the sensor absorbs moisture, mixed gas, pollution matters, etc. It is recommended that customers perform aging and calibration after sensors become stable according to the program and use occasions of the whole device.

15﹪-90﹪RH without condensation,greater or less than this range or long-term high temperature and high humidity will affect the life of the sensor.

Our sensors are certified with CE, 3C, ROHS, anti-explosion, fire prevention, and coal mining safety according to different applications. And we provide assistance for new certification.

Many factors can cause the sensor to fail such as broken wires in transportation, poisoning, falling off of the sensitive material, damage to the heating wire (device), etc. Please find specific cause in each category with Winsen’s aftersales.

Winsen provides professional consultation and service before and after sales. We will recommend the best fitting sensor for your demand. If you have any problem, don’t hesitate to email us to

Due to high volume of daily incoming emails and time zone difference, we may not be able to reply your emails immediately. But we will reply to your inquiry in 24 business hours.