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ESL040 Universal Liquid Level Sensor


ESL040 Universal Liquid Level Sensor | Level Transmitter

ESL040 line is for the measurement of liquid levels. Featuring high accuracy and stability, and high-strength cables that are wear-proof, acid/alkali resistant and oil resistant, this product can meet various demands for field measurement of liquid levels.  The ESL040 line is designed with special construction and for particularly challenging applications.  It is widely used for the treatment of wastewater and river water, and for hydrologic monitoring in ditches, reservoirs, rivers, coast and etc. non-polarized two-wire output and DC-AC three-wire output.


  • Pressure type: Gauge Pressure
  • Range: From0~1…500mH2O
  • Accuracy: ±25%F.S, ±0.5%F.S, ±1.0%F.S
  • Stability: 1%F.S/Year(typical), 0.2%F.S/Year(maximum)
  • Customized working temperature: -40℃~125℃
  • Signal Output:4~20mA, 0/1~5V, 0~10V
  • Power supply: 8/10/11~30V
  • Diffused silicon-oil fill system
  • Lightening protection
  • Degrees of Protection: IP68
RangeOverloadPrecisionStabilityWorking TemperatureInsulationElectric Strength
0~1...500mH2O1.5 times±0.25~±1.0%F.S0.1/0.2%F.S/Y-40~85℃>100MΩ@50V500V@60second
Two wireThree wireThree wireThree wire
Output Signal4~20mA0~5Vdc1~5Vdc0~10Vdc
Power Supply10~30Vdc8~30Vdc/ac8~30Vdc/ac11~30Vdc/ac
Load Resistance(U-10)/0.02(Ω)>100kΩ>100kΩ>100kΩ


Deep water level monitoring | River hydrologic monitoring | Wastewater treatment | Turbidity level measurement | Liquid level of storage tank | Water-saving irrigation | Diversion Project | Circulating fluid consumption monitoring


The probe measures liquid levels, basing on a simple relationship between the height of the liquid column and the resulting hydrostatic pressure. The pressure measurement is carried out on the level of separating diaphragm of the immersed probe and is related to atmospheric pressure through a capillary in the cable.

The active sensing element is a piezoresistant silicon sensor separated from the medium by an isolating diaphragm. The electronic amplifier, which words in combination with the sensor, and is meat to standardize the signal, is additionally equipped with an overvoltage protection circuit, which protects the probe from damage caused by induced interference from atmospheric discharges or from associated heavy current engineering appliance.

ESL040 Universal Liquid Level Sensor drawing

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  • General Instruction and Datasheet-ESL040 GID-3-EV02
  • Product Enquiry