35
O&M Manual
Rev-B (7/15)
Part 8 – Troubleshooting
8.1
General
The information included in this section is intended to be used in an attempt to quickly resolve an
operational problem with the system. During any troubleshooting process, it will save the most
time if the operator can first determine if the problem is related to the analyzer, sensor, or some
external source. Therefore, this section is organized from the approach of excluding any likely
external sources, isolating the analyzer, and finally isolating the sensor. If these procedures still
do not resolve the operational problems, any results the operator may have noted here will be
very helpful when discussing the problem with the factory technical support group.
8.2
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 outputs with a DMM.
3.
Check cell drive circuit. With a digital voltmeter (DVM), measure the voltage between
terminals 1 and 3 on the back of the monitor to verify that the millivolt value is actually -200
mV.
4.
Check TC drive circuit. Place a wire-short between the GREEN and RED terminals. With a
digital voltmeter (DVM), measure the voltage between the BLACK and GREEN 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
GREEN terminals. The temperature reading should display approximately 0°C and the
ozone reading should display approximately 0 ppm.
