TOCII CA72TOC Troubleshooting
Endress+Hauser 127
Faulty
adjustment
(adjustment
fault 3)
The calibration line
slope is negative or
zero.
CO
2
concentration
measured for
standard 1 is higher
than that for
standard 2
Standard solutions,
container empty
• Have the standard solutions been prepared properly?
• Do the two standard solutions have the same concentration?
• Have the standard solutions been swapped?
• Are the standard canisters empty?
Faulty
adjustment
(adjustment
fault 4)
KP value is smaller
than 30 or greater
than 150
Standard solutions
• Have the standard solutions been prepared properly?
Replace the standard solutions.
• Biological growth in the standard canisters.
Replace the canisters.
• Dilution option - feed rate of pump P4 deviates from the values
determined. Use the program module SERVICE/PUMPS/P1/P4
Replace pump hose to determine the feed rate for pump P4.
Faulty
adjustment
(adjustment
fault 5)
CO
2
concentration <
min. permitted CO
2
value.
(~ -9.4 % gas card
measuring range)
• Is the IR detector OK?
Convey pure supply gas through the IR detector.
Go to the programming module PRG/TEST/INPUTS/ANALOG
INPUTS and check whether the IR detector displays a negative
offset.
Replace the IR detector if the frequency displayed has dropped
below 10000 Hz.
Message Cause Tests or remedial action
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