17mm Level Transmitter

A hydrostatic level transmitter, also known as a hydrostatic pressure transmitter, is a type of level sensor that utilizes the principle of hydrostatic pressure to measure the level of a liquid in a container or vessel. It is widely used in industries such as oil and gas, chemical processing, water treatment, and wastewater management.

The basic operating principle of a hydrostatic level transmitter involves the measurement of the pressure exerted by the liquid column above the sensor. The transmitter consists of a pressure sensing element, typically a diaphragm or a piezoresistive sensor, which is in contact with the liquid being measured.

When the liquid level changes, the hydrostatic pressure exerted on the sensing element also varies. The pressure sensing element converts this pressure into an electrical signal, which is proportional to the liquid level. The electrical signal is then transmitted to a control system or a display unit for further processing or monitoring.

To ensure accurate measurements, hydrostatic level transmitters often include a reference leg. The reference leg is an additional pipe or tube filled with a reference fluid, such as air or nitrogen, which compensates for changes in atmospheric pressure. By comparing the pressure in the reference leg with the pressure at the sensing element, the transmitter can accurately determine the liquid level.

Submersible Level Transmitters: These transmitters are designed to be directly immersed in the liquid being measured. They are typically sealed to prevent liquid ingress and feature a rugged construction to withstand harsh environments. Submersible transmitters are commonly used in applications such as tanks, reservoirs, and sumps.

Hydrostatic level transmitters provide reliable and accurate level measurements over a wide range of liquid types and operating conditions. They are known for their robustness, long-term stability, and compatibility with various process fluids. The output signal of hydrostatic level transmitters is often in the form of a standardized analog signal, such as 4-20mA, which can be easily integrated into control systems for monitoring, control, and automation purposes.

Uses of Level Transmitters

• 17mm Level Sensors should be used in every bore hole pump installation to provide protection for the pump against operation at low water levels. Traditionally, this protection has been achieved by the use of “floatless probes” attached to the riser column from the pump, but these installations are typically very sensitive to the electrical noise generated by VFD pump controls and commonly do not work in installations with VFDs.
  • A level sensor gives an output that indicates the level of water above the pump and so the thresholds can be infinitely variable and the reaction to reducing water level can be programmable.
  • The output of a level sensor in a bore hole, can be used in a closed loop control system to regulate the rate of discharge from the well so that the well operates at a constant of maximum draw down, rather than a trip. The water can continue to flow at a reduced rate, rather than zero flow.  see pump control
    The minimum operating level (maximum draw down) should be set above the NPSH (Net Positive Suction Head) of the pump to prevent cavitation from occuring.
• The Level Transducer can be used to indicate the level of fluid in a sump. This level can be displayed on a SCADA, and can also be used in a closed loop system to determine the required rate of drainage from that sump, and if necessary, to provide fault and trip stimulae.
• Level Sensors are used to provide information on water levels in Dams, Ponds, Tanks and resevoirs. Such information is important in water supply systems.