Hach AS950 Basic Installation And Maintenance page 26

Problem
Sampler does not have
sufficient lift.
Sample volume is not correct.
26 English
Table 2 Troubleshooting table (continued)
Possible cause
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
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 20.