Overview

The submersible hydrostatic level meter (transmitter) is an instrument that operates on the principle that the static pressure of the liquid being measured is directly proportional to its height. It utilizes the piezoresistive effect of either diffusion silicon or ceramic sensitive elements to convert static pressure into an electrical signal. After temperature compensation and linear correction by the digital computing unit, it is converted into a standard 4-20mA DC current signal output. This instrument is widely used in systems and industries such as petrochemical, metallurgy, power generation, pharmaceuticals, water supply and drainage, and environmental protection.

Main Technical Parameters

Working Principle

When the level transmitter is submerged to a certain depth in the liquid being measured, the pressure on the sensor's exposed surface is given by the formula:
P=p·g·H+Po
Where:
P: Pressure on the transmitter's exposed surface
p: Density of the liquid being measured
g: Local gravitational acceleration
Po: Atmospheric pressure above the liquid surface
H: Depth of the transmitter submerged in the liquid
The pressure of the liquid is channeled into the sensor's positive pressure chamber via a stainless steel vent tube, while the atmospheric pressure Po is connected to the sensor's negative pressure chamber, negating the Po at the back of the sensor. Thus, the pressure measured by the sensor is p·g·H. Clearly, by measuring the pressure P, the depth of the liquid level can be determined.

Features

High precision and high stability
Easy to install and use, the submersible level transmitter can be directly submerged into the medium for measurement
Solid-state structure, no moving parts, high reliability, and long service life
Capable of high-precision measurements from water, oil to viscous paste-like substances
Unaffected by the foaming, sedimentation, or electrical properties of the medium being measured
Wide range of temperature compensation
The submersible level transmitter includes reverse polarity protection for the power supply and overload current limiting protection.