Teledyne API T802 Paramagnetic O2 Analyzer Operation Manual Troubleshooting and Service

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11.2.2.2. RELAY PCA STATUS LED S

D6
(
Y
ellow
)
O
2
Sensor Heater
D5 (Yellow) – CO
2
Sensor Heater
(only with CO
2
option)
D1 (RED)
Watchdog Indicator

Figure 11-4: Relay PCA Status LEDS Used for Troubleshooting

Table 11-4: Relay PCA Status LED Failure Indications

LED Color Function Status When LED Lit

(Energized State)

Status When LED Unlit

(Default State)
D1 Red Watchdog Circuit Cycles ON/OFF every 3 Seconds
under direct control of the analyzer’s CPU.
D2-D4 SPARE
D51 Yellow CO2 Sensor Cell heater Heating Not Heating
D6 Yellow O2 Sensor heater Heating Not Heating
D72 Green
D82 Green
D92 Green
D102 Green
D11 - 16 SPARE
1 Only active when the optional CO2 sensor is installed
2 Not Used
11.3. GAS FLOW PROBLEMS

When troubleshooting flow problems, it is a good idea to first confirm that the

actual flow and not the analyzer’s flow sensor and software are in error, or the

flow meter is in error. Use an independent flow meter to perform a flow check as

described in Section 10.3.4. If this test shows the flow to be correct, check the

pressure sensors as described in Section 11.6.8.

07275B DCN6418