Teledyne API T802 Paramagnetic O2 Analyzer Operation Manual Principles of Operation
231

AC Relay Retainer

Plate

Retainer

Mounting

Screws

Figure 12-11: Relay PCA with AC Relay Retainer in Place
12.5.4.1. STATUS LEDS LEDs located on the Analyzer’s relay PCA, show the current status of various control functions performed by the relay PCA The three that are used in the T802 are described in Table 12-1, and their locations are illustrated in Figure 12-12.
Table 12-1: Relay PCA Status LEDs
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.
07275B DCN6418