By Anthony Seal
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Extra info for Practical Process Control
Example text
The environment and the process details will do more to identify the level transmitter type to choose. Generally if the medium is of a slurry, small Which transmitter? 31 Fig. 15 Selection of styles and types of level transmitters from VEGA (courtesy of VEGA Controls Ltd). granules or fibre a diaphragmor ultrasonic type is the better option. If the vessel is closed a differential pressure type is required, and for effluent sumps, etc. a probe type is possibly more suited. If you are not familiar with 'what to put where', send your enquiry to several leading general transmitter suppliers.
Without a very repeatable, reasonably accurate, measurement device, generating the signal for the controller to work on, good quality control will never be achieved. Selection of the measurement device is hence where considerable effort made in the selection process will be well rewarded. g. an orifice plate will generate a differential pressure from the flow of a fluid passing through it, this differential being measured at points upstream and downstream of the orifice plate. A transmitter is then required to convert this differential pressure into a signal suitable for the controller, recorder, etc.
Another type which has been about for many years is the hydrostatic style level indicators and transmitters. The hydrostatic indicator types are often found on oil tanks and remote locations, since they require no power and are intrinsically safe. There are also several level transmitters made for special applications such as borehole levels, wood chip and grain silo level, etc. which work on operating principles similar to some of those detailed above. Some level measuring devices for difficult media use radioactive source and sensor.