Borehole Water Level Sensor | Borehole Level Transmitter | LMP305

Fully Submersible, Very Compact Ø19mm and Surge Protected

LMP 305 19mm submersible level sensor
Lead Time
3 - 4 weeks
Prices From
Accelerated delivery available
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At a Glance

  • 19mm Diameter
  • Ranges: 0-1mWG up to 0-250mWG
  • Outputs: 4-20mA
  • Environmental Protection: IP68 Fully Submersible
  • Accuracy: <±0.25 / <±0.35% / <±0.50% FSO
  • Very Compact Only 19mm Diameter 
  • Ideal for Borehole & Stilling Tube Level Measurements
  • Protected Against Power Surges from Lightning Strikes
  • Can be Submersed with the Borehole Pump or Installed at a Later Time
  • Fully Submersible & Long-Term Immersion Protected to 250m 
  • Excellent Long-Term Stability
  • Excellent Linearity


The Pi9941 borehole water level sensor is only 19mm in diameter, making it perfect for borehole and stilling tube level measurements.  It is equally at home in rivers, reservoirs, tanks and channels. The Pi9941 is also suitable for the measurement of pressure within submerged pipes and vessels thanks to their submersion protection to 250 metres.

The borehole water level sensor’s piezoresistive sensing element offers excellent resolution through its low noise characteristics coupled with very good accuracy and long-term stability.

The borehole water level transmitter’s standard output is a 2-wire 4-20mA signal which has a surge protection circuit to mitigate the effects of electrical transients caused by nearby lightning strikes and power supply fluctuations.

An all-stainless steel body gives the borehole water level transmitter excellent media compatibility characteristics across a wide range of potable water and harsh media applications.

For a higher accuracy level sensor with a slightly larger diameter, try our water tank level sensor LMP307.

Product Dimensions

Pi9941 borehole water level sensor outline


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