Emerson Process Management ROSEMOUNT NGA2000 HFID - Manual (Page 68)

Instruction Manual
748297-E
June 2003
4-30 Maintenance and Troubleshooting Rosemount Analytical Inc. A Division of Emerson Process Management
Model NGA2000 HFID
c. Drift
1. Verify that the sample, burner air,
and fuel supply pressures are
constant.
2. Check that the tubing, regulators,
pumps, fittings, and valves are
clean of hydrocarbons.
3. Verify that the oxygen level in the
burner air and sample are con-
stant.
4. Verify the THC level is correct for
the burner air and fuel supply.
5. Check that the ambient tempera-
ture is changing <10
°C per hour.
6. Verify the burner is clean.
7. Verify temperature of the sample
gas, case, burner, and oven has
stabilized.
8. Verify the Preamp PCB is clean.
9. Verify atmospheric pressure at
burner exhaust is constant.
10. Verify purge gas pressure is con-
stant.
11. Verify burner has been on and
stabilized.
12. Check for gas leaks.
d. Noise
1. Check that the burner exhaust is
free from water condensation.
2. Verify connection to the collector is
correct.
3. Verify connection to the polarizing
voltage is correct.
4. Check the ambient temperature is
changing <10
°C per hour.
5. Verify the +24VDC is clean and
grounded properly.
6. Verify there are no strong magnetic
fields near.
7. Check for excessive vibration.
8. Verify burner exhaust is vented to a
constant atmospheric pressure.
9. Verify bypass line is vented to a
constant atmospheric pressure.
10. Verify purge out port vented to a
constant atmospheric pressure.
11. Verify the collector wires are routed
away from the heater.
12. Verify the collector wires are clean
and not damaged.