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NR
Min-Max Control – 2 Switch Points (e.g. Pump Up, Filling)
With the power supplied and no probe electrodes are immersed in the media, the relay is activated. By that, the terminals 1 and 3 are shortened. As soon as the media level rises to reach the upper electrode (5) tip, the media is conducting it with the REF-Probe (6). The relay will be de-energised and the switch-over-contacts of the relay will connect the terminals 1 and 2. After that the level has dropped down below the bottom point, all electrodes are free, the relay is activated again.
RN
Max-Min Control – 2 Switch Points (e.g. Pump Down, Draining)
With the power supplied and no probe electrodes are immersed in the media, the relay is released. By that, the terminals 1 and 2 are shortened. As soon as that the media level rises to reach the upper electrode (5) tip, the media is conducting it with the REF-Probe (6). The relay will be energised and the switch-over-contacts of the relay will connect the terminals 1 and 3. After that the level has dropped down below the bottom point, all electrodes are free, the relay is de-energised and drops the contact.
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Function diagram
For both operation modes
For the use as single point steering, only one switch level is monitored, then the terminal 4 (Min. electrode) will remain unused.
For the dual level controllers, the terminals 1-8 of the 2nd device are numbered as 11-18 in the lower part of the controller.
Note!
The desired switching level threshold is acquired through the difference in the length of the Min. and the Max. electrode.
The electrode connected to the REF terminal, must be as long as the longest other probe rod.
In connection with the use of conductive vessels, the REF-Probe can be substituted by a connection between terminal 6 and the container.
Terminals 1 (11) to 3 (13):
Unrelated to the kind of power supply for the system, the terminal 1 can be wired up to any type of current / voltage withup to 250 Volt (AC or DC) above any other connection of the system.
This voltage is feed out through the Terminal 2 (12) or 3 (13) and may be loaded with up to 6 ampere
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