A submersible level transmitter sits inside a well casing or holding tank and reads liquid level through hydrostatic pressure. The sensor stays in constant contact with water, corrosive minerals, and debris. A design built for occasional contact fails under these conditions within months.
Level monitoring failures in water and wastewater systems cause real damage. A dry running well pump burns out early. An overlooked storm water tank overflows during heavy rain. The right submersible level transmitter, installed correctly, prevents both outcomes.
This article covers how a submersible level transmitter works in two applications, municipal well monitoring and storm water level sensing. It covers the specifications to check when you select one, and how the same technology applies across other industries.
Using a Submersible Level Transmitter in Municipal Wells
Small municipal water systems pull water directly from underground wells. When the well level drops below the pump intake without warning, the pump runs dry. Dry running damages the pump and interrupts water service to the community it supports.
A submersible level transmitter installed inside the well casing reads water level continuously through hydrostatic pressure. The transmitter sends a steady signal to the pump controller. The controller shuts the pump down before damage occurs.
Two design factors matter most in this application. The housing material has to withstand years of constant submersion without corroding. Standard sensor materials break down under this exposure. The cable venting has to keep the reading referenced to atmospheric pressure when submersion depth changes.
Using a Submersible Level Transmitter in Storm Water Holding Tanks
Stormwater systems move at a different pace than a well. Holding tanks fill fast during heavy rain. Pump control equipment needs real-time level data to prevent overflow.
A submersible level transmitter feeds a 4-20mA signal directly to the pump control system. The response happens without delay. Debris causes the main failure in this application. Sediment and runoff clog standard sensors fast. The nose cone design must resist buildup on its own.
What to Look for in a Submersible Level Transmitter
Your specification should account for the conditions above. Look for these features:
- Housing material rated for corrosion resistance under constant submersion, typically 316 stainless steel
- IP68 rating with a submersion depth that covers your well or tank depth
- A vented cable design that keeps the reading accurate regardless of depth changes
- A self-flushing nose cone or debris-resistant design for stormwater and sediment heavy applications
- HART or Modbus output for integration with your pump controller
A process submerging a sensor in fluid for long periods creates the same risk regardless of industry. Corrosion, debris, and signal drift build up over time. A transmitter built to handle water and wastewater conditions holds up in chemical processing, nuclear power, oil and gas, and power generation applications too.
Site conditions vary from well to well and region to region. A one-size configuration rarely fits every site. A slow custom order process costs a utility time it lacks during storm season or a pump failure. Look for a manufacturer adjusting seal material, cable length, or output configuration without adding a separate custom order timeline.
The SOR 815LT Submersible Smart Level Transmitter
The SOR Measurement and Control 815LT Submersible Smart Level Transmitter meets these requirements. Core specifications:
- IP68 rated, submersible to depths up to 1200 feet
- 316 stainless steel housing for corrosion resistance
- Range from 0 to 35 feet w.c. up to 0 to 575 feet w.c.
- HART 7 and Modbus RTU configuration
- Standard PVC self-flushing nose cone
- Optional 2.5-inch stainless diaphragm seal with protective cage for sludge and slurry conditions
- 3-year warranty
Read the Application Notes for real-life use cases:
Sensing Water Levels in Municipal Wells (PDF)(PDF)
Sensing Storm Water Levels (PDF)(PDF)
SOR Controls Group Engineers-to-Order each unit and delivers with Off-The Shelf Speed. Our products are supported by more than 100 manufacturer reps covering over 70 countries. Each rep works directly in their region, with knowledge of local regulations and site conditions specific to the area. A utility engineer working with a rep gets a specification review from someone who understands their regional water authority requirements, not a generic call center response.
Frequently Asked Questions
Q. What is a submersible level transmitter used for?
A. It measures liquid level through hydrostatic pressure in applications with continuous or frequent submersion. Common uses include municipal wells, storm water holding tanks, sumps, reservoirs, and slurry tanks.
Q. How deep does a submersible level transmitter reach?
A. The SOR 815LT carries an IP68 rating and reaches submersion depths up to 1200 feet.
Q. How does a submersible level transmitter resist corrosion in a well or stormwater environment?
A. The 815LT housing is built with 316 stainless steel. It withstands years of constant submersion and exposure to minerals, sediment, and runoff. Standard sensor materials corrode under these conditions over time.
Q. How does a submersible level transmitter handle debris in stormwater applications?
A. The 815LT standard configuration includes a PVC self-flushing nose cone, which resists clogging. An optional 2.5-inch stainless diaphragm seal with a protective cage handles heavier sludge or slurry conditions.
Q. What output and communication options does a submersible level transmitter support?
A. The 815LT supports HART 7 communication and Modbus RTU serial communication. A vented cable design keeps the reading always referenced to atmospheric pressure.
Q. What range of options are available?
A. The 815LT covers a pressure range from 0 to 35 feet w.c. up to 0 to 575 feet w.c., depending on the model.
Q. Does a submersible level transmitter get customized for a specific well or stormwater site?
A. Yes. SOR engineer’s configuration changes such as seal material, cable length, and output type without a separate custom order timeline. Utilities get a site-specific build on a standard delivery schedule.
Q. What industries use submersible level transmitters?
A. The 815LT serves chemical processing, nuclear power, oil and gas, original equipment manufacturers, power generation, and water and wastewater industries.
Q. What applications fit a submersible level transmitter beyond wells and stormwater?
A. Tanks, sumps, reservoirs, slurry service, and wastewater holding tanks.
Q. Where do I find a SOR rep for my region?
A. SOR Controls Group supports more than 100 reps across over 70 countries, each with knowledge of regional regulations and site conditions. Find your local rep with our Find a Rep Tool.
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