Introduction
Basically, submersible pressure transmitters or level probes are used in varying immersion depths and filling heights up to several hundred metres. They are used in the widest range of different media, and therefore must offer IP 68 ingress protection with unlimited time of immersion in the given measuring depth. The physical design of a submersible pressure transmitter is specifically optimised for the requirements of hydrostatic pressure measurement in immersion applications, and offers an unmatched watertight sealing and media resistance.
Working principle
The measuring cell or the sensor of a submersible pressure transmitter is used for measuring the hydrostatic pressure at the measuring point. There is a diaphragm in the transmitter that works as a pressure sensor . Even under the most severe conditions, in the measurement of media which is dirty, containing particulates or fibres, with abrasive contents or sludge, the measuring cell of a level probe must ensure accurate and reliable measurement.We will put this transmitter in to the bottom of a tank and we have a cable that goes up to the surface .The submersible pressure transmitter will sends 4-20 mA signal corresponding to the pressure.To get the information about the pressure we need to know the depth of the tank and the length of the cable
In principle a submersible pressure transmitter can be divided into five different design elements: the sensor or measuring cell, the electronics, the housing, the cable entry and the cable itself.
The figure shown below is a submersible pressure transmitter with a cage specially designed for waste water applications.The cage will protect the diaphragm from dirt.
Special features
■ Slimline design
■ Scalable measuring range (option)
■ Resistant against the harshest environmental conditions
■ Reliable and secure by double-sealed design
■ Titanium case for especially high resistance (option)
Applications
■ Deep well and borehole measurements
■ Groundwater monitoring
■ Level measurement in open bodies of water
■ Sewage lift and pumping stations
■ Settling ponds and rainwater basins
