A hydrostatic pressure transmitter is a type of pressure transmitter that is specifically designed for applications involving the measurement and monitoring of liquid levels. These transmitters are commonly used in industries such as water and wastewater treatment, oil and gas, chemical processing, and food and beverage.
Hydrostatic pressure transmitters work based on the principle of hydrostatic pressure, which is the pressure exerted by a fluid at equilibrium due to the force of gravity. They typically comprise piezoresistive sensors that help compensate for static pressures. These transmitters can also be provided with protocols such as Foundation Fieldbus and HART®.
The static pressure liquid level transmitter has become a unique liquid level transmitter due to its independent characteristics of function, zero point, and range adjustment. The working principle is to use the static pressure of the water head to measure the liquid level, and convert this pressure into a (4-20) mA signal output. It is mainly composed of an air collector, a pressure pipe, a connecting body, and an internally packaged differential pressure transmitter.
Hydrostatic Pressure Transmitter types #
Static pressure level transmitters are divided into two types: side mounted PMD3051 series and input SLS300 series.
The side mounted type is actually a pressure transmitter with a smaller range, while others are generally installed on the outer side of the bottom of the tank.
Key points for installation of input type liquid level transmitter: #
- Pressure level sensors cannot be used in environments with ultra-high temperatures, over ranges, and strong magnetic fields, as these environments seriously affect the accuracy and service life of the level gauge.
- When measuring static water level with a pressure type liquid level sensor, the liquid level gauge should be placed at the bottom of the container but not in contact with the sediment or sludge at the bottom. It is recommended to install the liquid level gauge around 10cm~15cm away from the bottom when there is deposited liquid to avoid sensor blockage.
- Pressure and liquid level sensors usually use PVC pipes or steel pipes with a diameter greater than the diameter of the water level gauge. The pipes are fixed in the water and several small holes are drilled at different heights to facilitate the smooth entry of water into the pipes. Alternatively, a damping device can be installed at the bottom to filter sediment and eliminate the impact of dynamic pressure and waves on the measurement.
- The installation direction of the pressure and liquid level sensor should be vertical, and the installation position should be away from the inlet and outlet as well as vibration sources.
- Connect according to the wiring instructions provided by the manufacturer. Generally, a 2-wire 4-20mA signal output is used.
- It is strictly prohibited to touch the pressure sensor diaphragm with hard objects.
- Different liquid level transmitter structures should be used for measuring different media.
Ordering requirements for Hydrostatic Pressure Transmitter: #
Measurement medium, temperature, pressure, tank or pool position, liquid level gauge installation and fixation method, measurement position, measurement range, signal output requirements, cable length, etc.
