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Principles Of Operation
Teledyne ML - T101 Operation Manual
270
10.4.9.
STATUS LEDS & WATCH DOG CIRCUITRY
Zero/Span and IZS Options
Sample/Cal Valve
IZS Option
Permeation Tube Heater
Dark Shutter
Sample Chamber
Heater
I
2
C
Watchdog LED
Zero/Span and IZS Options
Zero/Span Valve
H
2
S
SO
2
converter heater
SO
2
/H
2
S valve
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
LED
COLOR
FUNCTION
STATUS WHEN LIT
STATUS WHEN UNLIT
D1
RED
Watchdog circuit
Cycles On/Off every 3 seconds under control of the CPU.
D2
YELLOW Sample chamber
heater
HEATING
NOT HEATING
D3
YELLOW
H
2
S
SO
2
converter
heater
HEATING
NOT HEATING
D4
YELLOW Unused
N/A
N/A
D5
YELLOW IZS heater Perm.
Tube (option)
HEATING
NOT HEATING
D6
YELLOW Unused
N/A
N/A
D7
GREEN
Sample/Cal Valve
(option)
Valve open to zero/span
valve.
Valve open to sample inlet
D8
GREEN
Zero/Span Valve
(option)
Valve open to zero gas inlet
Valve open to span gas inlet
D9
GREEN
SO
2
/H
2
S valve
Gas stream bypasses H
2
S
SO
2
converter. Analyzer
measuring SO
2
Valve open to H
2
S
SO
2
converter. Analyzer
measuring H
2
S.
D10
GREEN
Unused
N/A
N/A
D11
GREEN
UV Lamp Shutter
Shutter open
Shutter closed
D12-14 GREEN
Unused
N/A
N/A
Содержание T101
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