Hydrostatic level transmitters are designed for depth/level measurements in deep wells, groundwater, rivers, water towers, sewage treatment plants and other similar applications. They are a form of two-wire level transmitter that consists of a probe (made from stainless steel) and a special breathing cable (containing a capillary pipe) and a stress resistant inlet.
Hydrostatic level transmitters can be used in both indoor and outdoor applications, however, if it is being used in an outdoor application it is recommended that application of an over voltage protector be used.
Hydrostatic level transmitters can be used in clean liquids in bore holes and are especially recommended for monitoring and controlling submersible pumps.
How they work
As the hydraulic pressure increases with the height of the water column a displaced electrical charge accumulates on the opposing surface of the cell. This generates an output signal, which is converted to a signal that is directly proportional to the pressure applied. The level metering is based on a measurement of the pressure difference between the hydrostatic pressure of the liquid head above the probe and the actual atmospheric pressure.
Semrad
Semrad Pty Ltd is a leading Australian distributor of level switches and transmitters, designed specifically for harsh industrial applications, including caustic and chemical solutions. They produce NivoPress NP Hydrostatic level transmitters for commercial and industrial use.
For more information click here to view the Semrad Pty Ltd website.
MWS-ST/SR-2WG Micro-Gunn
MWS-ST/SR-2WG Micro-Gunn producded by Semrad Pty Ltd was developed as a substitution for infrared hot metal detectors (HMD), laser/optical barriers and gamma ray sensors for product tracking in steel mills.
MWS-ST/SR-2WG Micro-Gunn consists of a pair of transmitting and receiving antennas, connected to separate controllers by circular wave guide tubing. The detection signal outputs when the microwave beam is reflected by the slab/strip into the receiving antenna.
Advantages
MWS-ST/SR-2WG Micro-Gunn required no maintenance. It operates flawlessly in high vapor areas (compared to optical and infrared based sensors which do not). It has a high degree of precision and is economical, reliable and a great hazard free solution for product tracking in continuous casting and rolling mills.
Submersible Level Transmitter
Semrad Pty Ltd distributes the NivoPress submersible hydrostatic level transmitter in Australia, along with various level switches such as the Nivofloat and NivoMag, level transmitters including EchoTrek and LabkoMax, foam controllers, safety systems, displays and process controllers.
The NivoPress is a two-wire level transmitter consisting of a probe and a special breathing cable containing a capillary pipe and a stress resistant inlet. The probe consists of a stainless steel cartridge with a membrane at the end. It works by measuring the pressure difference between the hydrostatic pressure of the liquid head above the probe and the actual atmospheric pressure. This is then converted into a 4 to 20mA output signal. The cable material is polyurethane.
The device can operate between temperatures of -10° to +60°C, with a linearity of <0.2%. It features a range of up to 200 metres, reverse polarity protection, accuracy of 0.5% and optional lightning protection.
Applications
This submersible hydrostatic level transmitter can be applied to clean or faintly chemically contaminated liquids in boreholes, open reservoirs and tanks. It is easy to install in existing facilities and is especially recommended for monitoring and controlling submersible pumps.