Hach AS950 AWRS, Basic Installation And Maintenance

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Table 2 Troubleshooting table (continued)
Problem Possible cause Solution
Sampler does not have
sufficient lift. Strainer is not completely
submerged. Install the shallow depth strainer (2071 or
4652).
Intake tube has a leak. Replace the intake tube.
Pump tube is worn. Replace the pump tubing on page 20.
Pump roller assembly is worn. Contact technical support.
Sample volume is not correct. Incorrect volume calibration Repeat the volume calibration.
Incorrect tube length is specified in
the sampling program. Make sure that the correct tube length is
in the sampling program.
Intake tube does not purge
completely. Make sure that the intake tube is as
vertical and as short as possible.
Strainer is not completely
submerged. Install the shallow depth strainer (2071 or
4652).
Worn pump tubing and/or roller
assembly. Replace the pump tube and/or roller
assembly.
The liquid detector is disabled. Turn the liquid detector on and complete
a volume calibration.
Liquid detector does not operate
properly. Calibrate the liquid detector with the
same liquid that is sampled.
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