Hach-Lange SIGMA SD900 Refrigerated Sampler and All Weather Refrigerated Sampler User Manual - Manual (Page 89)

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Section 7 Troubleshooting
7.1 General troubleshooting
Refer to the information in Table 7 when a problem with the
sampler occurs.
Table 7 SD 900 general troubleshooting information
Problem Cause Solution
Instrument will not power on with AC
power.
Problem may be with the controller,
power supply or main power source. Isolate components to determine which
component has the problem.
Problem with circuit breaker.
Check the circuit breaker in the AWRS
and for the main power.
Problem with electrical outlet.
Check to see if the outlet is receiving
power.
Defective power supply (refrigerated
sampler only).
Replace power supply or use a battery.
Defective controller. Contact the service center.
Sampler will not create sufficient lift.
Strainer is not completely submerged.
Make sure the strainer is completely
submerged.
Intake tube has a leak. Replace intake tube.
Pump tube is worn. Replace pump tube.
Pump roller assembly is worn. Contact the service center.
Inaccurate sample volumes.
Incorrect volume calibration.
Repeat the volume calibration and take
a grab sample to verify accuracy.
Incorrect intake tube length is
programmed in the sampler. Measure the intake tube length and
enter in the program setup menu.
Intake tube is not completely purging.
Make sure the intake tube is on a
downward slope as vertical as possible,
with no low points where liquid can
accumulate.
Strainer is intermittently submerged.
Install the shallow depth strainer
(Cat. No. 2071 or 4652).
Worn pump tubing and/or roller
assembly. Replace pump tubing; contact service
center for roller assembly.
When the liquid sensor is disabled,
variable suction heads will cause
variable sample volumes.
Enable the liquid sensor and complete a
volume calibration.
Liquid sensor is not operating properly.
Calibrate the liquid sensor using the
same liquid that is being sampled.