General Troubleshooting - Hach As950 Installation Et Entretien

Chemical exposure hazard. Dispose of chemicals and wastes in accordance with local, regional and
national regulations.
Fire and explosion hazard. This product contains a flammable refrigerant. Dispose of chemicals and
wastes in accordance with local, regional and national regulations.
Section 6 Troubleshooting

6.1 General troubleshooting

Table 2 shows causes and corrective actions for several common problems.
Problem
No instrument power
Sampler does not have
sufficient lift.
Sample volume is not correct.
C A U T I O N
C A U T I O N
Table 2 Troubleshooting table
Possible cause
Problem with the main power
source.
Defective power supply
(refrigerated sampler only)
Defective controller
Strainer is not completely
submerged.
Intake tube has a leak.
Pump tube is worn.
Pump roller assembly is worn.
Incorrect volume calibration
Incorrect tube length is specified in
the sampling program.
Intake tube does not purge
completely.
Strainer is not completely
submerged.
Worn pump tubing and/or roller
assembly.
The liquid detector is disabled.
Liquid detector does not operate
properly.
Solution
Make sure that AC power gets to the
electrical outlet.
Replace the power supply.
Contact technical support.
Install the shallow depth strainer (2071 or
4652).
Replace the intake tube.
Replace the pump tubing
Contact technical support.
Repeat the volume calibration.
Make sure that the correct tube length is
in the sampling program.
Make sure that the intake tube is as
vertical and as short as possible.
Install the shallow depth strainer (2071 or
4652).
Replace the pump tube and/or roller
assembly.
Turn the liquid detector on and complete
a volume calibration.
Calibrate the liquid detector with the
same liquid that is sampled.
on page 18.
English 23