Teledyne MODEL T703 Manual Do Utilizador
Teledyne API T703 Calibrator Operation Manual
Theory of Operation
157
9.2.3.2. Heater Control
The relay PCA controls the DC heaters for the O
3
generator and photometer lamp housing.
Figure 9-5:
Heater Control Loop Block Diagram.
9.2.3.3. Relay PCA Status LEDs and Watch Dog Circuitry
Thirteen LEDs are located on the calibrator’s relay board to indicate the status of the calibrator’s heating zones
and some of its valves as well as a general operating watchdog indicator. Table 11-2 shows the states of these
LEDs and their respective functionality.
and some of its valves as well as a general operating watchdog indicator. Table 11-2 shows the states of these
LEDs and their respective functionality.
D15 (Yellow) - Photometer Lamp Heater
D16 (Yellow) – O
3
Generator Lamp Heater
D7 (Green) – Photometer Meas/Ref Valve
D6 (Green ) – Ext. Zero Air Valve
D9 (Green) – Photometer Pump Status
D1 (RED)
Watchdog
Indicator
Figure 9-6:
Status LED Locations – Relay PCA
07223B DCN6378