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WP311B Immersion Type 4-20mA Water Level Transmitter

Short Description:

WP311 Series Immersion Type 4-20mA Water Level Transmitter (also called submersible/Throw-in pressure transmitter) use the hydrostatic pressure principle to convert measured liquid pressure to level. WP311B is the split type, who is mainly consisted of a non-wetted junction box, throw-in cable and sensing probe. The probe adopts sensor chip of excellent quality and is perfectly sealed achieving IP68 ingress protection. The immersion part can be made of anti-corrosion material, or be reinforced to resist lightning strike.

Product Detail

Product Tags


WP311B Immersion type Water Level Sensor can be used to measure & control liquid level in:

  • ✦ Reservoir Surveillance
  • ✦ Sewage Treatment Factory
  • ✦ Petrochemical Storage
  • ✦ Pharmaceutical and Medical
  • ✦ Building Automation
  • ✦ LNG Fueling Station
  • ✦ Environmental Protection
  • ✦ Offshore and Maritime



Advanced imported hydrostatic sensing component and superb diaphragm sealing technology are applied on WP311 series level transducers. The sensor chip is placed inside a stainless steel (or other materials for corrosion protection) enclosure. A steel cap on the top of probe protects the sensor and make medium contact the diaphragm more smoothly. This Submersible level transmitter has precise measurement, outstanding long-term stability and remarkable sealing and anti-corrosion performance.


Range/cable length chosen from 0~200m

Top-tier waterproof IP68 protection

Outdoor lightning protection type available

Selectable analog outputs and smart comms.

Great corrosion-proof and tightness

Exceptional accuracy for level measurement

Explosion-proof type: Ex iaIICT4 Ga; Ex dbIICT6 Gb

Local display : LCD, LED, Smart LCD


Item name Immersion type 4-20mA Water Level Transmitter
Model WP311B
Measuring range 0-0.5~200mH2O
Accuracy 0.1%FS; 0.25%FS; 0.5 %FS
Power supply 24VDC
Probe/diaphragm material SS304/316L, PTFE, Ceramic, Customized
Cable sheath material PVC, PTFE, Rigid stem, Capillary, Customized
Output signal 4-20mA(1-5V); Modbus RS-485; HART; 0-10mA(0-5V); 0-20mA(0-10V)
Operating temperature -40~85℃ (The medium cannot be solidified)
Ingress protection IP68
Overload 150%FS
Stability 0.2%FS/year
Electrical connection Terminal box cable gland, Customized
Process connection M36*2 Male, Flange DN50 PN1.0, No fixture device, Customized
Probe connection M20*1.5
Integrated display LCD, LED, Intelligent LCD
Medium Water, oil, fuel, diesel and other liquid chemicals.
Ex-proof type Intrinsically safe Ex iaIICT4 Ga; Flameproof Ex dbIICT6 Gb; Lightning protection
For more information about WP311B Submersible Liquid Level Transmitter, please feel free to contact us.

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