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Instruction Manual
748297-E
June 2003
Rosemount Analytical Inc. A Division of Emerson Process Management Maintenance and Troubleshooting 4-29
Model NGA2000 HFID
4-3 TROUBLESHOOTING CHECKLIST
a. Safety System
1. Verify purge supply pressure at
bulkhead is between 10 and 20
psig.
2. Check case for leaks.
3. Check burner for leaks.
4. Verify purge pressure sensor tube
connection.
5. Verify purge out port is vented to
atmospheric pressure.
6. Verify Safety PCB connector J2 is
attached.
7. Check for a +24V power glitch.
8. Verify that there is no large vibra-
tion shock.
9. Check for external leak in purge
line.
10. Verify case pressure is greater than
0.5” of water.
11. Check case for over-pressurization.
12. Verify the purge flow/pressure
switch harness is routed away from
the solenoid valves.
13. Verify the purge timer is counting.
14. Verify purge timer jumper is cor-
rectly installed.
15. Verify Internal purge pressure is
greater than 5.5 psig.
16. Verify the purge gas switch has
been activated.
b. Ignition
1. Verify that the fuel pressure/flow is
correct.
2. Verify that the burner air pres-
sure/flow is correct.
3. Verify that the ignitor is generating
enough heat.
4. Verify the burner exhaust is vented
to atmosphere.
5. Verify safety system has been acti-
vated.
6. Verify the manual switch is operat-
ing correctly.
7. Verify auto-ignite parameters are
properly set.
8. Verify burner is properly sealed.
9. Verify quality of air supply is good.
10. Verify quality of fuel supply is good.
11. Check burner tip for damage.
12. Check air and fuel restrictor for cor-
rect flow.
13. Check burner tip alignment.
14. Verify burner cone is tight.
15. Check burner air and fuel lines for
leaks.
16. Verify oven temperature is greater
than 85°C.
17. Verify the reference thermistor is
100K ohm ±15% at 25°C.
18. Verify that there is +10VDC to the
reference thermistor.