Gas Flow Problems - Teledyne T101 Operation Manual

Troubleshooting & Service
Table 9-3. Relay Board Status LEDs
LED COLOR
Watchdog Circuit; I2C bus
D1 red
Relay 0 - sample chamber
D2 yellow
Relay 1 – H
D3 yellow
1
D4 yellow Spare
D5 yellow Relay 3 - IZS heater
D6 yellow Relay 4 - Spare
2 Valve 0 - zero/span valve
D7 green
Valve 1 - sample/cal valve
2
D8 green
Valve 2 - auto-zero valve
D9 green
Valve 3 - SO/SOx valve
D10 green
D11 green Valve 4 - Spare
D12 green Valve 5 - Spare
D13 green Valve 6 - Spare
D14 green Valve 7 - Spare
D15 green Mosfet1-Unused
D16 Green Mosfet2-Unused
1
Special configurations only
2
Only active for instruments with Z/S valve or IZS options installed

9.2. GAS FLOW PROBLEMS

220
FUNCTION
operation.
heater
S converter
2
heater
status
status
status
status
The standard T101 has one main flow path. With the IZS option installed, there is a
second flow path flow path through the IZS oven that runs whenever the IZS is on
standby to purge H S from the oven chamber. The IZS flow is not measured and is not
2
available from the front panel. The full flow diagrams of the standard configuration
(Figure 3-10) and with options installed (Figure 3-2 and 5-3) help in trouble-shooting
flow problems. In general, flow problems can be divided into three categories:
Flow is too high
•
Flow is greater than zero, but is too low, and/or unstable
•
Flow is zero (no flow)
•
When troubleshooting flow problems, it is essential to confirm the actual flow rate
without relying on the analyzer's flow display. The use of an independent, external flow
meter to perform a flow check as described in Section 9.5.2 is essential.
Teledyne ML - T101 Operation Manual
FAULT
STATUS
Continuously Failed or halted CPU; faulty
ON or OFF motherboard, keyboard, relay board;
wiring between motherboard, keyboard
or relay board; +5 V power supply.
Continuously
Heater broken, thermistor broken
ON or OFF
Continuously
Heater broken, thermocouple broken
ON or OFF
N/A N/A
Continuously
Heater broken, thermistor broken
ON or OFF
N/A N/A
Continuously Valve broken or stuck, valve driver chip
ON or OFF broken
Continuously Valve broken or stuck, valve driver chip
ON or OFF broken
Continuously Valve broken or stuck, valve driver chip
ON or OFF broken
Continuously Valve broken or stuck, valve driver chip
ON or OFF broken
N/A N/A
N/A N/A
N/A N/A
N/A N/A
N/A N/A
N/A N/A
INDICATED FAILURE(S)