Model NGA2000 HFID

Instruction Manual

748297-E June 2003

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.

Sample RTD 657061

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.

Cartridge Heater 659643

Thermostat 657065

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.

Rosemount Analytical Inc. A Division of Emerson Process Management

Maintenance and Troubleshooting 4-11