ATI
Q46H/65 Residual Chlorine Dioxide System
Part 10
– Troubleshooting
63
O&M Manual
Rev-J (11/18)
interference. 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
for 5.1 must be followed when replacing the membrane.
10.3 Analyzer Tests
1. Disconnect power and disconnect all output wiring from the analyzer. Remove sensor wiring,
relay wiring, and output wiring. Turn on power.
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 -200mV.
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 ClO
2
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.
MESSAGE
DESCRIPTION
POSSIBLE CORRECTION
Max is 200
Entry failed, maximum user value allowed is 200. Reduce value to
≤ 200
Min is 20
Entry failed, minimum value allowed is 20.
Increase value to
≥ 20
Cal Unstable
Calibration problem, data too unstable to
calibrate. Icons will not stop flashing if data is too
unstable. User can bypass by pressing ENTER.
Clean sensor, get fresh cal solutions, allow
temperature and conductivity readings to fully
stabilize, do not handle sensor or cable during
calibration.
Out of Range
Input value is outside selected range of the
specific list item being configured.
Check manual for limits of the function to be
configured.
Locked!
Analyzer security setting is locked.
Enter security code to allow modifications to
settings.
Unlocked!
Analyzer security has just been unlocked.
Displayed just after security code has been
entered.
