Section 7 troubleshooting, 1 general troubleshooting – Hach-Lange Sigma SD900 Portable User Manual
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Section 7
Troubleshooting
7.1 General troubleshooting
Refer to the information in
sampler occurs.
Table 6 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 for the main
power.
Problem with electrical outlet.
Check to see if the outlet is receiving
power.
Defective power supply.
Replace power supply or use a battery.
Defective controller.
Contact the service center.
Instrument will not power on with DC
power.
Battery is not charged.
Replace with a fully charged battery.
Battery does not hold charge.
Replace battery or use an AC power
supply.
Defective controller.
Contact the service center.
Battery life is short.
Insufficient voltage.
The lead-acid battery should hold
12.6 V to 13.4 V when fully charged.
Battery power drains quickly.
Fully charge the battery and allow to
stand for one hour. If the voltage drops
below 12.5 V, replace the battery.
Incorrect sampler base configuration.
Set sampler base to portable option
(
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.
Stainer 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.