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Code
Fault message
Diagnosis
M03
Span Stability
Four attempts at a span calibration are made before this error is reported.
There are several reasons why this can occur.
The standard solution is varying in purity, is not of
constant supply, or has not been introduced for
sufficiently long time.
The persulfate has carbon impurities or it is not being
delivered constantly.
TIC extraction/acid mix is not constant. This can be
because no TIC extraction or purely irregular supply of
acid. If there isn't any TIC in the standard, the acid is a
small diluent to the sample actually getting into the
reactor.
Leaking fluid or gas system.
Poor IR cell heater control.
M04
Span level
In order to pass an autocalibration, it is necessary to
achieve 65% of the theoretical CO
standard. For example, if the analyzer is calibrated with
10000 ppm CO
and the analyzer is a 1000 mg/L
2
analyzer, and if the single point standard is 1000 mg/L,
it is expected that the gas produced will be at least
6500 ppm CO
.
2
0.65 FSD gas
Expected CO
=
-----------------------------------------------------------------------
2
•
•
0.65 10,000 1,000
------------------------------------------------------- -
=
1,000
= 6,500 ppm CO
2
Most likely problems:
1.
Insufficient oxidation, due to either insufficient
persulfate (supply or strength) or weak or dead UV
lamps.
3.
Bad standard.
5.
Fluid leak.
M05
Maintenance %
The current calibration deviates from the primary
calibration by greater than the Maint % v Pri entry in the
Setup/Tolerance/Maint % screen. See
page
84.
UVTOCTroubleshooting and Service.fm
for the applied
2
•
•
CAL STD
Analyzer FSD
(See above)
section 5.2.8.3 on
Corrective action
Ensure a constant flow of standard. Verify the calibration
valves are fully open. Increase the Pre span delay to
ensure that the analyzer has achieved a stable IR CO
reading before performing a span.
Check the condition of the persulfate delivery system.
Verify acid delivery system constant and that there aren't
any impurities in the acid. Use fresh TIC free calibration
standard.
Fix leak.
Verify cell temperature is constant 49 °C ±1 °C.
Increase span size.
2.
Check the condition of the persulfate delivery
system. Check concentration of persulfate.
Investigate a dead lamp.
4.
Remix a standard verifying that it matches the value
entered in the Single cal std menu.
6.
Fix leak.
Increase the Maintenance % in the
Setup\Tolerance\Maintenance % Screen.
Replace peristaltic pump tubing and perform a primary
calibration.
Maintenance Code Diagnostics
Section 8
2
Page 133
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