ATI Q46H/85 PAA System Part 10 – Troubleshooting
60
O&M Manual
Rev F (8/17)
loads when they are switched on an off, the relay wiring placement can result in electrical
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 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 PAA Sensor Preparation, must be followed when replacing the membrane.
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 (-) terminal and WHITE (+) 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 PAA reading
should display approximately 0 ppm.
10.4 Display Messages
The Q46 Series instruments provide a number of diagnostic messages which indicate problems
during normal operation and calibration. These messages appear as prompts on the secondary
line of the display or as items on the Fault List.
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