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Instruction Manual
748297-E
June 2003
Rosemount Analytical Inc. A Division of Emerson Process Management Maintenance and Troubleshooting 4-11
Model NGA2000 HFID
Sample RTD
657061
Cartridge Heater
659643
Thermostat
657065
d. Thermal Block
The sample RTD can be replaced with the
thermal block attached to burner and
mounted in oven. The cartridge heater
and thermostat are also replaceable with
thermal block secured to burner, but must
be removed from the oven.
Sample RTD
1. Refer to Figure 4-4A on page 2-1.
Remove the four screws securing the
oven cover, remove cover.
2. Disconnect the sample RTD wiring
connector, note location.
3. Refer to Figure 4-9 below. Remove
the two screws securing the sample
RTD, pull sample RTD out.
4. Install replacement sample RTD, se-
cure with screws.
5. Attach sample RTD wiring connector.
6. Re-attach oven cover.
Figure 4-9. Thermal Block – Sample RTD, Cartridge Heater and Thermostat
Cartridge Heater
1. Remove oven from analyzer module
per Section 4-2a on page 4-3.
2. Remove burner/thermal block from
oven per Section 4-2b on page 4-4.
3. Refer to Figure 4-9 above. Loosen
retaining set screw, pull out cartridge
heater.
4. Install replacement cartridge heater,
snug down set screw.
5. Install burner/thermal block into oven.
6. Install oven into analyzer module.