ATI
Q46/84 Hydrogen Peroxide Monitor
Part 10 - Troubleshooting
50
O&M Manual
Rev-H (6/17)
lower level. Also, due to the large amount of energy present in circuits driving these types of
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 H
2
O
2
Sensor Assembly, on page 36, 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 analog outputs and relays with a DVM.
3.
Check cell drive circuit. Place a wire short between terminals 3 and 4. With a digital
voltmeter (DVM), measure the voltage between terminals 1 and 4 on the back of the monitor
to 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 DVM, measure the voltage between terminals BLACK and RED to verify the TC drive
voltage of 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 H
2
O
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 200
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!
Transmitter security setting is locked.
Enter security code to allow modifications to
settings.
