3. Remove tubing from the flame cell exhaust and use a digital flow meter to
adjust the air control valve until you obtain a reading of 160 cc/min.
4. Turn off the air supply.
5. Set the auto relight switch (
S1
) on the electrometer printed circuit board (PCB)
to the
OVERRIDE
position.
6. Use the digital flow meter to adjust the hydrogen control valve until you obtain
a reading of 100 cc/min.
7. Turn on the air supply.
8. Set the auto relight switch (
S1
) on the electrometer PCB to the
RUN
position.
The auto relight sequence begins as follows:
a. The LED on the electrometer comes on after 10 seconds, and the glow
plug fitted to the side of the flame cell is supplied a voltage.
b. After another five seconds, the hydrogen shut-off valve operates.
c. The gas mixture ignites.
d. If the flame does not light in five seconds, the electrometer de-energizes
the hydrogen shut-off valve to stop the flow into the flame cell.
e. The flame cell is purged with air and nitrogen carrier gas.
f. The process starts again (up to ten times) until the flame stays lit.
g. If the flame does not stay lit, the LED flashes. If the alarm output is linked
to the 2350A controller discrete input, an alarm is present on the
controller.
h. Set the auto relight switch (
S1
) on the electrometer PCB to the
RESET
position and then back to the
RUN
position.
i. The relight sequence restarts.
Potential cause
The FPD is out.
Recommended actions
1. In Rosemount MON2020, click
Open H2 Valve
.
The H2 Valve Cur State field changes to
Open
.
2. Click
Ignite
.
The Flame Status field changes when the internal temperature exceeds the
value set in the Flame On Sense Temp field.
Note
If the Flame Ignition field is set to
Auto
, the GC will automatically restart the
flow if it goes out.
3. If the GC fails to light after resetting the electrometer, recheck the air and
hydrogen flow.
Reference Manual
Troubleshooting
2-3-9000-744
June 2022
Rosemount 700XA
187
Summary of Contents for Rosemount 700XA
Page 1: ...Reference Manual 2 3 9000 744 Rev L June 2022 Rosemount 700XA Gas Chromatograph ...
Page 6: ...TxD TD or Sout Transmit data or signal out 6 ...
Page 30: ...Overview Reference Manual June 2022 2 3 9000 744 30 Emerson com Rosemount ...
Page 100: ...Installation and start up Reference Manual June 2022 2 3 9000 744 100 Emerson com Rosemount ...
Page 182: ...Operation and maintenance Reference Manual June 2022 2 3 9000 744 182 Emerson com Rosemount ...
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