Data Sheet

72 Series -
Monitoring relays
MI function example
This shows the 72.42 Priority change relay working in conjunction
with a single 72.01 level controller. Under normal conditions the
liquid level is expected to remain within the range shown as Min
to Max. In this case the function of the 72.42 will be to alternate
the duty between both pumps, to even wear across both pumps.
There is no provision to run both pumps simultaneously.
Outline drawings
72.42
Screw terminal
72.01/11
Screw terminal
ME function example
This shows the 72.42 Priority change relay working in conjunction
with two 72.01 level controllers. Under normal conditions the
liquid level is expected to remain within the range shown as Min
to Max. In this case the function of the 72.42 will be to alternate
the duty between both pumps, to even wear across both pumps.
Should the liquid level rise above the Alarm level then the function
of the 72.42 will call for the simultaneous operation of both
pumps, by virtue of the signal to terminal B3 from the Alarm/Low
level controller.
Note: due to the low level of 72.42 control signals, it is suggested
to use level controller 72.01.8.240.5002 because of its superior
low load switching capability.
8
IX-2012, www.findernet.com