Instruction manual

NGA 2000 MLT Hardware
TROUBLESHOOTING
10 - 3
Emerson Process Management GmbH & Co. OHG
Instruction Manual
90002929
07/2006
10.3 Display Messages
Several operating conditions of the analyzer / module are controlled and signalized via correspond-
ing messages of the display.
Failures can be shown at the menu “Status” → “Status details” → “Failures” (Item “4.1.1 Status
details” of software manual).
10.3.1 Chopper Fail
Possible Causes Check / Correct
a) Chopper fail: Check connection to PCB “PIC” Fig. 1-32) or
PCB “DSP” Fig. 1-33) resp.;
see section 11.1.3
10.3.2 Raw Signal Too High / Low
Possible Causes Check / Correct
a) Concentration of sample gas is to high. Reduce gas concentration.
Use another analyzer suitable for the
concentration range involved.
b) Incorrect physical zero point Check and adjust physical zero point alignment
(see Section 17.5 / 11.1.6)
.
c) Contamination of the gas paths Check if photometric components are dirty,
clean or replace the components if necessary
(cf. Section 17.).
Check and adjust physical zero point alignment
(see Section 17.5 / 11.1.6)
DISPLAY MESSAGES