Calibrate to the exact measurement you want
Submersible Pressure Transducers
for liquid level measurement
Submersible pressure transducers, also known as hydrostatic level sensors, measure level by converting the pressure of a liquid based on its height above the sensor and its density into a linear output signal. These sensors can be a cost-effective solution for monitoring water level in outdoor applications as well as for measurement inside tanks that are vented to atmosphere such as diesel fuel tanks. Submersible pressure transducers are available with intrinsically safe ratings for applications that are considered hazardous locations. For applications with foaming, solids, or reflectivity issues, submersible pressure transducers will outperform competing technologies.
Core Sensors can manufacture most standard configurations quickly with expedites available. Our submersible portfolio is assembled at our New Jersey facility, with many sub-assemblies prepared for quick shipment of your exact calibrated pressure, output and cable length.
CS12 Submersible Pressure Transducer
Commonly designed for water level measurement applications that do not require a hazardous area rating.
CS82 Intrinsically Safe Submersible Pressure Transducer
Used for hydrostatic level measurement of liquids including fuels requiring an intrinsically safe rating.
CS15 Non-Clogging Submersible Pressure Transducer
Flush diaphragm design for viscous media level measurement such as wastewater level
Submersible Level Sensor Application Notes
Measure liquid level in vented and sealed tanks using submersible pressure transducers, gauge pressure transducers, and differential pressure transducers.
Core Sensors offers a wide variety of pressure transducer designs that cater to the wastewater and water treatment industry.
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What is the difference between a submersible level sensor, submersible pressure transducer, and submersible level transmitter?
While these terms are often used interchangeably, there are subtle differences:
A submersible level sensor is designed to measure liquid level when submerged with a low level output signal such as millivolt.
A submersible pressure transducer converts hydrostatic pressure into an electrical signal such as 1-5V or 0.5-2.5V.
A submersible level transmitter transmits the level measurement in an amplified output signal such as 4-20mA, suitable for longer length transmissions. Since submersible level sensors can have longer lengths of to measure the hydrostatic pressure, 4-20mA is a popular output signal amongst submersible level devices.
In practice, these devices often perform the same function of measuring liquid level in tanks, wells, or open bodies of water.
What is the difference between a nose cone and cage?
A nose cone is a protective component at the tip of a submersible level sensor or pressure transducer. It serves several important functions:
- Protects the sensing element from damage
- Allows liquid to reach the sensing diaphragm while keeping debris away
- Can be designed to reduce turbulence for more stable readings
The design of the nose cone can significantly impact the sensor’s longevity in challenging environments.
Cage designs are utilized in flush diaphragm submersible transmitters, such as the CS15 series. The diaphragm of the transmitter sits flush with the inside of the cage to prevent clogging inside a port in liquids that are viscous including wastewater.
How does liquid level equal output signal in a submersible pressure transducer?
Submersible pressure transducers use the principle of hydrostatic pressure to sense liquid level:
- The pressure at the bottom of a liquid column is directly proportional to its height and density.
- The transducer measures this pressure and converts it to an electrical signal.
- The output signal (e.g., 4-20mA) is calibrated to correspond to specific liquid levels.
For example, 4mA might represent an empty tank, while 20mA represents a full tank. The relationship between level and output is typically linear, allowing for easy conversion between the electrical signal and the actual liquid level.
Can submersible pressure transducers operate from a battery power supply?
Yes, submersibles can be designed to operate from battery power. Key considerations include:
- Low power consumption designs to extend battery life
- Use of energy-efficient output signals (e.g., low-power 0.5-2.5V available from Core Sensors)
- Intermittent measurement modes to conserve energy
- Integration with solar panels for remote, long-term deployments
Battery-operated sensors are particularly useful in remote locations or where wired power is not available.
What are the advantages of a 4-20mA output signal in submersible applications?
The 4-20mA output is a popular choice for submersible pressure transmitters due to several advantages:
- Long-distance transmission: Can transmit signals over long cable runs with minimal signal degradation
- Noise immunity: Less susceptible to electrical noise compared to voltage outputs
- Loop-powered operation: Can be powered and transmit data over the same two wires
- Fault detection: Any current below 4mA indicates a fault in the system
- Industry standard: Widely compatible with existing control and monitoring systems
These features make 4-20mA suitable for many industrial and water management applications.
What are common applications for submersible level sensors?
Submersible level sensors are widely used in various industries and applications, including:
- Water and wastewater treatment plants
- Groundwater monitoring wells including landfills
- River and stream level monitoring
- Tank level measurement in industrial processes and remote installations
- Flood warning systems
- Underground utility systems
- Oceanographic research
- Hydraulic reservoir level monitoring
Their versatility and reliability make them essential in many liquid level measurement scenarios.
How do I protect my submersible from fouling?
To protect your sensor from fouling:
- Install the sensor away from areas prone to sediment accumulation
- Consider using a protective cage or shroud
- Implement regular cleaning and maintenance schedules
Proper protection can significantly extend the sensor’s life and maintain measurement accuracy.
How do I choose between a vented and non-vented submersible?
The choice between vented and non-vented sensors depends on your application:
Vented submersible sensors: A vent tube extends from the inside of the housing of the submersible sensor through the cable along the conductors to the point of termination. Core Sensor submersible sensors are offered standard with a vented cable.
- Compensates for atmospheric pressure changes
- Provide higher accuracy, especially in shallow water applications
- May require added protection and termination in a dry panel or desiccant filter
Non-vented submersible sensors
- Simpler installation with standard cables
- May require a separate barometric pressure sensor for compensation
- Generally more suitable for deep water applications
Consider factors like required accuracy, installation depth, and maintenance capabilities when making your selection.
Are submersible pressure transducers used in non-submersible applications?
Yes, submersible pressure transducers can be used in non-submersible applications, such as:
- Tank level measurement from the bottom without submersion (externally mounted)
- Pressure measurement in pipes or closed systems
- Applications requiring excellent moisture and corrosion resistance including flood-prone areas such as underground utility stations
Their robust design and ability to withstand harsh environments make them versatile for various industrial applications beyond submersible use. Under each nose cone features a threaded NPT process connection.
Connect With Our Sales Team
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Fill out the form and a member of our sales team will contact you to discuss your requirements. You can also give us a call at (862) 245-2673.
