Display Messages; Chopper Fail; Raw Signal Too High / Low - Emerson ROSEMOUNT Analytical NGA 2000 Instruction Manual

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"
details" of software manual).
10.3.1

Chopper Fail

Possible Causes
a) Chopper fail:
10.3.2

Raw Signal Too High / Low

Possible Causes
a) Concentration of sample gas is to high.
b) Incorrect physical zero point
.
c) Contamination of the gas paths
Emerson Process Management GmbH & Co. OHG
"Status details" "Failures" (Item "4.1.1 Status
Check / Correct
Check connection to PCB "PIC" Fig. 1-32) or
PCB "DSP" Fig. 1-33) resp.;
see section 11.1.3
Check / Correct
Reduce gas concentration.
Use another analyzer suitable for the
concentration range involved.
Check and adjust physical zero point alignment
(see Section 17.5 / 11.1.6)
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)
NGA 2000 MLT Hardware
TROUBLESHOOTING
DISPLAY MESSAGES
10 - 3