27
M720 pH/ORP Controller Owner’s Manual
2. Inadequate Flow: Check ow through ow cell and
controller.
3. Blown output fuse in the controller: Replace fuse.
G. Flow LED o
1. Verify that all appropriate valves are open.
2. Verify that there is sucient pressure in the line. Close right
side valve slightly if necessary.
3. Verify that the ow switch is securely connected to the
controller terminals.
4. Both the pH and ORP dose outputs are disabled if the green
Flow LED is not illuminated.
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