Hach AS950 Basic Installation And Maintenance

Table 2 General troubleshooting (continued)
Problem Possible cause Solution
Sampler does not have
sufficient lift.
Strainer is not fully
submerged.
Install the shallow depth strainer.
Intake tube has a leak. Replace the intake tube.
Pump tube is worn. Replace the pump tubing on page 21.
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 sampler
program.
Make sure that the correct tube length
is in the sampler program.
Intake tube does not fully
purge.
Make sure that the intake tube is as
vertical and as short as possible.
Strainer is not fully
submerged.
Install the shallow depth strainer.
Worn pump tubing and/or
roller assembly.
Replace the pump tube and/or roller
assembly.
The liquid detector is
disabled.
Set the liquid detector to on and
complete a volume calibration.
Liquid detector does not
operate properly.
Calibrate the liquid detector with the
same liquid that is sampled.
26 English

Hach AS950 Specifications

General

Sample Frequency	Programmable
Type	Portable
Sampling Method	Vacuum Pump
Temperature Control	Refrigerated
Bottle Configuration	24 x 1L bottles
Power Supply	12V DC
Communication	RS-232
Sampler Type	Portable or Stationary
Vertical Lift	8.2 m
Enclosure Rating	IP67
Number of Samples	Up to 999
Storage Capacity	24 samples
Bottle Options	1L