Status Leds & Watch Dog Circuitry - Teledyne T101 Operation Manual

Principles Of Operation
10.4.9. STATUS LEDS & WATCH DOG CIRCUITRY
Watchdog LED
Sample Chamber
LED COLOR
D1 RED
D2 YELLOW
D3 YELLOW
D4 YELLOW
D5 YELLOW
D6 YELLOW
D7 GREEN
D8 GREEN
D9 GREEN
D10 GREEN
D11 GREEN
D12-14 GREEN
270
2
I C
Heater
Figure 10-17. Relay Board Status LED Locations
Thirteen LEDs are located on the analyzer's relay board to indicate the status of the
analyzer's heating zones and valves as well as a general operating watchdog indicator.
Table 10-2 shows the states of these LEDs and their respective functionality.
Table 10-2. Relay Board Status LEDs
FUNCTION
Watchdog circuit
Sample chamber
heater
H S  SO converter
2 2
heater
Unused
IZS heater Perm.
Tube (option)
Unused
Sample/Cal Valve
(option)
Zero/Span Valve
(option)
SO /H S valve
2 2
Unused
UV Lamp Shutter
Unused
Teledyne ML - T101 Operation Manual
IZS Option
Permeation Tube Heater
Dark Shutter
SO /H S valve
2 2
Zero/Span and IZS Options
Zero/Span Valve
Zero/Span and IZS Options
Sample/Cal Valve
S  SO
H converter heater
2 2
STATUS WHEN LIT
Cycles On/Off every 3 seconds under control of the CPU.
HEATING
HEATING
N/A
HEATING
N/A
Valve open to zero/span
valve.
Valve open to zero gas inlet
Gas stream bypasses H
SO converter. Analyzer
2
measuring SO
2
N/A
Shutter open
N/A
STATUS WHEN UNLIT
NOT HEATING
NOT HEATING
N/A
NOT HEATING
N/A
Valve open to sample inlet
Valve open to span gas inlet
S  Valve open to H
2
converter. Analyzer
measuring H S.
2
N/A
Shutter closed
N/A
S  SO
2 2