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083730400A DCN8130
Teledyne API – Model T400 O
3
Analyzer
153
Table 6-1. Relay Board Status LEDs
LED COLOR
FUNCTION
STATUS WHEN LIT
STATUS WHEN UNLIT
D1
RED
Watch Dog Circuit
Cycles On/Off every 3 seconds under direct control of the analyzer’s
CPU.
D2
YELLOW Metal Wool Scrubber Heater
HEATING
NOT HEATING
D3-D6
SPARE
D7
GREEN
Zero/Span Gas Valve
1
Valve Open to SPAN GAS FLOW Valve Open to ZERO GAS FLOW
D8
GREEN
Measure/Ref Valve
Valve Open to REFERENCE path
Valve Open to MEASURE path
D9
GREEN
Sample/Cal Gas Valve
2
Valve Open to CAL Gas Flow
Valve Open to SAMPLE Gas Flow
D10-D14
SPARE
D15
GREEN Photometer UV Lamp Heater
HEATING
NOT HEATING
D16
GREEN
IZS O
3
Generator UV Lamp
Heater
HEATING
NOT HEATING
1
Only present when the Z/S valve option is installed.
2
Only present when either the Z/S valve option or the IZS valve option is present.
Figure 6-10. Relay Board Status LED Locations
6.3.3.2
I
2
C WATCH DOG CIRCUITRY
Special circuitry on the relay board monitors the activity on the I
2
C bus and drives LED
D1. Should this LED ever stay ON or OFF for 30 seconds, the watch dog circuit will
automatically shut off all valves as well as turn off the UV sources and all heaters. The
Sample Pump will still be running as it is not controlled by the relay board.
6.3.3.3
HEATER CONTROL
In the base version of the Model T400 photometric analyzer, there is only one DC heater
operated by the relay PCA. It is attached to the Photometer UV Lamp housing and
maintains the temperature of the UV Lamp at a constant 58ºC.
Additional DC heaters also controlled by the relay PCA, are included in the following
optional components:
Содержание T400
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