Instruction manual

17 - 3

NGA 2000 MLT Hardware

REPLACEMENT AND CLEANING OF PHOTOMETRIC COMPONENTS

Emerson Process Management GmbH & Co. OHG

Instruction Manual

90002929

07/2006

LIGHT SOURCE REPLACEMENT

Fig. 17-2: Chopper Housing with IR light sources

1 Light source hexagonal mounting screw

2 Light source with mounting flange

3 Temperature sensor (older versions)

4 Chopper Housing

17.2 Light Source Replacement (IR)

❍ Open the housing (cf. Section 15).

❍ Remove the photometer assembly out of analyzer housing (see Section 17.1).

❍ Remove the two light source hexagonal mounting screws (shown in Fig. 17-2 as Item 1).

❍ Remove the light source together with its mounting flange.

❍ Remove the mounting flange from the light source and position it on the new light source.

❍ Insert the new light source and flange in the same position as the old one.

❍ Insert and tighten the two light source hexagonal mounting screws (Fig. 17-2).

Then:

❍ Replace the photometer assembly (see Section 17.4).

❍ Perform the physical zeroing procedure (see Section 17.5).