HYDROSTATIC LEVEL MEASUREMENT

Submersible Level Transmitters

Hydrostatic submersible level sensors for water wells, tanks, reservoirs, and wastewater treatment. IP68 probe with 4-20mA output, ranges from 0~1 m to 0~200 m water column. Lightning protection and anti-corrosion options available.
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Our Submersible Level Transmitter Range

Select the right probe for your liquid type and installation environment — standard, lightning-protected, or anti-corrosion models available.

HM21 Submersible Level Transmitter

HM21

Standard submersible probe for water wells, tanks, and reservoirs. IP68 rated with long cable.

Range: 0~1 m to 0~200 m

Accuracy: ±0.5% FS

Output: 4-20mA

Protection: IP68

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HM21F Lightning Protected Level Transmitter

HM21F

Built-in lightning protection for outdoor installations near open water and exposed environments.

Range: 0~1 m to 0~200 m

Lightning: Built-in SPD

Output: 4-20mA

Protection: IP68

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HM21R Anti-Corrosive Level Transmitter

HM21R

PTFE/PFA coated probe for corrosive liquids including acids, alkalis, and chlorine-containing water.

Range: 0~1 m to 0~100 m

Material: PTFE/PFA coating

Output: 4-20mA

Protection: IP68

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How to Choose the Right Level Transmitter

Step 1 — Check your liquid type: Clean water and mild chemicals → HM21 (standard 316L SS). Outdoor installations with lightning risk → HM21F (built-in surge protection). Strong acids, alkalis, or chlorine-containing water → HM21R (PTFE/PFA coating).

Step 2 — Determine measurement range: Match probe cable length to tank or well depth. Standard ranges from 1 m to 200 m water column. For very deep wells, consult our engineers for custom cable lengths.

Step 3 — Consider installation environment: Underground wells need longer cables and vented reference tubes. Open tanks may need mounting brackets. Corrosive environments need PTFE protection on both the probe diaphragm and cable.

Frequently Asked Questions

Our HM21 series supports depths from 1 meter to 200 meters water column. The cable length should exceed the maximum expected level by at least 1 meter. For very deep wells, consult our engineers for custom cable lengths and reference tube venting.

The standard HM21 uses 316L stainless steel, suitable for clean water and mild chemicals. For strong acids, alkalis, or chlorine-containing water, use the HM21R with PTFE/PFA coating that protects both the diaphragm and cable from chemical attack.

The HM21F has a built-in surge protection device (SPD) in the cable junction that absorbs voltage spikes from nearby lightning strikes. This is essential for outdoor installations like reservoirs, open channels, and water treatment plants where the long metal cable acts as a lightning antenna.

Need Help with Level Measurement?

Tell us about your application — tank dimensions, liquid type, depth range, and installation environment. Our engineers will recommend the right probe model, cable length, and mounting solution.

Our engineers typically respond within 12 business hours with detailed technical specifications and pricing.

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