ATI
Q46H/79PR Chlorine Manual
Part
10 – Troubleshooting
64
O&M Manual
Rev-E (5/17)
interference for other devices. This can be quickly resolved by moving wiring, or by adding
very inexpensive snubbers (such As Quencharcs) to the load.
8. Carefully examine any junction box connections for loose wiring or bad wire stripping. If
possible, connect the sensor directly to the analyzer for testing.
9. Check the sensor membrane to be sure that the “shiny” side of the membrane is facing out.
See Critical Note on page 38.
10. Check sensor membrane for fouling. Look closely for signs of grease or oil which may be
present. Replace membrane and electrolyte, allow to stabilize, and re-check. The procedure
in section 5.1
Chlorine Sensor Preparation, on page 38, must be followed when replacing
the membrane.
11. Check to see that the chlorine in the water is total chlorine and not free chlorine.
10.3 Analyzer Tests
1.
Disconnect power and completely disconnect all output wiring coming from the analyzer.
Remove sensor wiring, relay wiring, and analog output wiring. Re-apply power to the
analyzer.
2.
Using the Simulate feature, check operation of analog outputs and relays with a DMM.
3.
Check cell drive circuit. Place a wire-short between WHITE and BLUE. With a digital
voltmeter (DVM), measure the voltage between ORANGE (-) and BLUE (+) Terminals. Verify
that the millivolt value is actually -400 mV.
4.
Check TC drive circuit. Place a wire-short between the GREEN and BLACK terminals. With
a digital voltmeter (DVM), measure the voltage between the BLACK and RED terminals on
the back of the monitor to verify that the TC drive circuit is producing about 4.8-5.1 VDC open
circuit. Remove DVM completely and connect a 100 Ohm resistor from the BLACK to RED
terminals. The temperature reading should display approximately 0°C and the chlorine
reading should display approximately 0 ppm.
