Controlling & monitoring - ENR - GALVATEK - #1

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Rod-type level probes in conjunction with electronic control units ensure that important process parameters are controlled and monitored sa­fely. Appropriate types of electronic control unit are mandatory because the probes have to be powered with a low probe voltage (pure sinusoidal AC voltage).

The response sensitivity can be set to different levels according to the conductivity of the process fluid.

The ENR200 is equipped with a relay output (MIN/MAX contact) that can be configured as a break or make contact, according to the

application. The switching delay for compensating for rapid level fluctu­ations can be switched between 2 s and 14 s. As well as the MIN/MAX, the ENR300 has an independent switching contact. This switching contact is used for monitoring a MIN/MAX fluid level.

The ETS100 electronic level monito­ring system is used for monitoring a fluid level as a MIN or MAX swit­ching contact. The contact switches if the required maximum level is exceeded or the level drops below the defined minimum. The contact is reactivated automatically when

the level of the process fluid returns to the „permitted" range. Run-dry protection for heaters and pumps is a very common type of application for this type of system. The heater or the pump is switched off if the level drops below minimum, and reactiva-

ted only when the level rises back above the minimum.

The ETS200 is capable of monitoring two fluid levels independently of one another.

The electrical connection is made using removable, non-interchan­geable plug-in terminals. A test function enables the output side to be checked. The LEDs indicate when the electronic control units are ready to operate, as well as the switching status of the outputs.

The electronic control units are in­stalled in the control cabinet, where the relatively small dimensions of their housings permit space-saving installation.