Swan Analytical Instruments AMI Hydrazine, Руководство оператора, Страница: 53 / 86

AMI Hydrazine
Troubleshooting
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7. Troubleshooting
This chapter provides some hints to make troubleshooting easier.
For any detailed information how to handle or clean parts please see
Maintenance, p. 35 . For any detailed information how to program the
instrument please see Program List and Explanations, p. 61 .
Process
calibration
Possible error message

Current value too low or no sample flow.
 Offset Error
 Slope Error
Current value too low or no sample flow:
Offset Error:
Possible cause Corrective action
The ppb value of the sample is
too low, thereby, the current dif-
ference to zero is too small.  Process value used for
calibration should be higher.
 Check the diagnostic value of
the zero point.
Low sample flow resulting in no
signal difference to zero. Check sample inlet pressure, if
necessary readjust sample flow
to min. 170 rpm.
Hydrazine sensor contaminated
Sensor does not provide enough
current for the value measured
with the manual analysis. Clean sensor, see Cleaning of
Hydrazine sensor, p. 38 .
In case of repeated sensor con-
tamination, check for water treat-
ment chemicals such as
phosphates.
Possible cause Corrective action
Run-in time of sensor to short.
Let the sensor run-in at least 30
min
Zero point calibration was too
short. Repeat the zero point calibration