ATI
Q46H/63 Combined Chlorine System
Part 10 – Troubleshooting
67
O&M Manual
Rev-K (11/18)
devices. This can be quickly resolved by moving wiring, or by adding very inexpensive
snubbers (such As Quencharcs) to the load.
7. Carefully examine any junction box connections for loose wiring or bad wire stripping. If
possible, connect the sensor directly to the analyzer for testing.
8. 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
for 5.1
Chlorine Sensor Preparation must be followed when replacing the membrane.
9. Check the sensor membrane to ensure that the “shiny” side of the membrane is facing
outward. See Critical Note on page 33.
10. Check to see that the chlorine in the water is combined 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. With a digital voltmeter (DVM), measure the voltage between
ORANGE (-) and WHITE (+) terminals. Verify that the millivolt value is actually -400mV.
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.
