Home > Blog > Submersible Pressure Transducers for Liquid Pressure and Level Measurement

Submersible Pressure Transducers for Liquid Pressure and Level Measurement

Submersible Pressure Transducers are a special type of pressure transmitter. Equipped with a sturdy, durable and airtight stainless steel casing with a protection level of up to IP68. The probe measures static pressure. This allows conclusions to be drawn about the current liquid level, i.e. the height of the liquid column above. Commonly used for underwater pressure and level measurement in water tanks, wells, shafts and boreholes.

Sino-Inst manufactures and supplies various types of Submersible Pressure Transducers. Supports customization of material, installation method, measuring range, output signal and other parameters to meet your specific needs.

RFQ

Featured Submersible Pressure Transducers

**SI-1180 General Purpose Silicon Piezoresistive Pressure Sensor**

SI-1188-Explosion-Proof-Pressure-Sensor — **SI-1188 Explosion-Proof Pressure Sensor**

SI-1801-Waterproof-Pressure-Sensor — **SI-1801 Waterproof Pressure Sensor**

**Submersible Level Transmitter 0-10m-50m-200m**

**Stainless Steel Submersible Level Sensor | High Temperature – Corrosive Liquid**

**Deep Well Water Level Sensor | Up to 200~2000mH2O**

**Chemical Level Sensor with PTFE Probe-Submersible**

Model	Range	Medium	Material/Protection	Output	Application
SI-1801 Waterproof Pressure Sensor	0-200 m H₂O（See datasheet）	Clean water, well water	316SS · IP68	4-20mA	Water well and tank water levels
Submersible Level Transmitter	0-10 m ~ 200 m（See datasheet）	Water, general liquids	316SS · IP68	4-20mA / RS485	Remote liquid level monitoring
Deep Well Water Level Sensor	200 ~ 2000 mH₂O	Deep well, high lift	316SS · IP68	4-20mA	Deep well dynamic/static water levels
Chemical Level Sensor, PTFE Probe	0-20m	Acid, alkali, corrosive liquid	PTFE	4-20mA	Chemical storage tanks
Integrated Temperature and Pressure Submersible Sensor	0-2000m	Need to measure temperature at the same time	316SS · IP68	4-20mA / RS485	Hydrological and environmental monitoring

Principle of liquid level measurement by Submersible pressure transducer

The pressure level transmitter is made of advanced isolated diffused silicon sensitive components. Simply put it into a container or body of water to accurately measure the height from the end of the water level gauge to the water surface. And the water level value is output through 4-20mA current or RS485 signal.

Using static pressure measurement principle:
When the liquid level transmitter is put into a certain depth of the liquid to be measured, the pressure formula on the liquid surface of the sensor is: Ρ = ρ .g.H + Po

In the formula:
P: Pressure on the liquid surface of the transmitter
ρ: Density of measured liquid
g: local gravity acceleration
Po: Atmospheric pressure on the liquid surface
H: Depth of the transmitter into the liquid

At the same time, the pressure of the liquid is introduced into the positive pressure chamber of the sensor through the gas-guiding stainless steel. Then connect the atmospheric pressure Po on the liquid surface to the negative pressure chamber of the sensor. to offset Po on the back of the sensor. Let the pressure measured by the sensor be: ρ.g.H. Obviously, by measuring the pressure P, the liquid level depth can be obtained.

Submersible pressure transducer measures water level

Submersible pressure transducers are commonly used in the water and wastewater industries. This is the simplest, most effective, and low-cost way to measure water level. With IP68 protection grade and stainless steel material, the submersible pressure transmitter is used in the widest range of different media.

Applications:

Wastewater treatment and biogas production;
Alkaline water and fuel tank level measurement for shipbuilding;
oil and fuel storage tanks;
Mining and Gas Extraction;
Water level measurement in rivers and lakes;
deep well and groundwater monitoring;
Level measurement in containers and storage systems;
Sewage lift pump and pumping station control;
sewage, sediment and flood drainage system monitoring;

Submersible pressure transmitter for corrosive liquids

Submersible anti-corrosion pressure transmitter is a fully sealed submersible structure. An anti-corrosion ceramic capacitive pressure sensor is used.

The probe put into the measured medium is made of corrosion-resistant materials such as PVC, PP or PVDF. The gas cable uses special anti-corrosion liquid level wire made of PTFE. Mainly used in liquid level measurement of corrosive media such as acids and alkalis.

This product has multiple designs for reliable sealing in the connections of the shell, wires and other links. The interior adopts a full potting process. This ensures that the product has a long service life. It is widely used in chemical industry, environmental protection, medicine, industrial process control and many other occasions.

Temperature and pressure integrated Submersible sensor

The Submersible pressure + temperature integrated transmitter is composed of an isolated liquid level sensor, a temperature sensor and a dedicated circuit for the instrument. It converts the liquid level (pressure) and temperature of the measured medium into 4~20A standard electrical signals respectively.

The product adopts an integrated design and can detect the liquid level and temperature at a certain point at the same time. It is suitable for places where liquid level and medium temperature are measured at the same time.

Temperature and pressure integrated Submersible sensor

Features:

Liquid level (pressure) + temperature multi-function measurement
Dual 4~20mA signal output
High precision, all stainless steel structure
Strong anti-interference and good long-term stability
Gas cable transmission
Anti-condensation and anti-lightning strike design
Intrinsically safe explosion-proof

FAQ

A submersible pressure transducer is a stainless-steel sensor designed to measure liquid pressure. Rated up to IP68, it is submerged to the bottom of the liquid and converts the measured pressure into a liquid level reading. These transducers are commonly used for pressure and level measurement in tanks, wells, and boreholes.

The working principle is based on the fact that the static pressure at a specific point in a liquid is directly proportional to the distance from that point to the liquid surface (P=ρgh). Here, P represents the pressure at the measured point, ρ is the medium density, g is the acceleration due to gravity, and h is the height from the measured point to the liquid surface. For a given medium (where ρ and g are constants), changes in the position relative to the surface correlate directly with the measured pressure (P).

A liquid level sensor is a device used to detect the height and position of a liquid; it converts changes in liquid level into electrical signals for use in automated control systems. In water pump systems, the sensor’s primary role is to monitor the water level in a tank or reservoir in real-time and feed this data back to a controller or PLC system. When the water level drops below a preset lower limit, the controller activates the pump to replenish the water; when the level reaches the upper limit, the pump stops, thereby preventing dry running or overflow.

The cost of a submersible pressure transducer is determined by several configuration factors, including measurement range, cable length, medium corrosiveness, and the inclusion of a local display. Market prices generally range from USD 200 to USD 1,000. Below are the specifications for a submersible pressure transducer we recently supplied to a customer:

Submersible Pressure Transducer
Measured Medium: Chilled Water
With local display
4-20mA output
2m range (2m cable)
Power supply: 24 VDC
Accuracy: 0.5% FS
Temperature: 35°C
FOB Price: USD 210.00/set