REMINDER FOR ADJUSTING THE SET-POINT
LAB STORAGE TANKS
19
98-0123 Rev E
The resistivity controller has an on-board single pole, double throw relay that is rated at 1 amp @ 28VDC
and 0.5 amp at 120VAC. This has both normally open and normally closed contacts, allowing for control
both above and below the set-points.
The relay acts simply as a switch. When the water quality is above the set-point (Green LED), the relay is
in a de-energized state and there is a completed circuit between the COM and NC terminals of the relay.
If the water quality is below the set-point (Red LED), the relay is energized completing the circuit
between the COM and NO terminals, while simultaneously disconnecting the COM / NC circuit. Figure 4
shows the connection location for the relay in the resistivity controller.
Figure 4
Summary of Contents for 00HC-4090
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Page 7: ...COMPONENT IDENTIFICATION LAB STORAGE TANKS 5 98 0123 Rev E 2 COMPONENT IDENTIFICATION...
Page 8: ...COMPONENT IDENTIFICATION LAB STORAGE TANKS 6 98 0123 Rev E...
Page 9: ...COMPONENT IDENTIFICATION LAB STORAGE TANKS 7 98 0123 Rev E 2 1 Flow Schematic...
Page 15: ...OPERATION LAB STORAGE TANKS 13 98 0123 Rev E Figure 3 Grundfos Eye Indicators...
Page 16: ...OPERATION LAB STORAGE TANKS 14 98 0123 Rev E 5 2 Default Pump Program...
Page 28: ...REPLACEMENT PARTS LAB STORAGE TANKS 26 98 0123 Rev E 11 REPLACEMENT PARTS...
