Hach 900 MAX User Manual

Page 134

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Page 132
Troubleshooting and Error Messages

8990apdx_tbl.fm

Appendix C

Sigma 900 MAX Refrigerated Sampler Troubleshooting Issues

Problem

Cause

Solution

Instrument Will Not
Power Up With ac
Power.

Blown Fuse.

Check the 5-amp fuse on the back of the controller.

Circuit breaker issue.

Check the circuit breaker for the main power.

Breaker is good, but still no power.

Check to see if the outlet is receiving power.

Breaker and outlet are good, still no power.

Try using a battery or another power supply

Sampler Will Not
Create Sufficient Lift.

If any holes on the anchor strainer are not
submerged the sampler will not create a lift.

Make sure the anchor strainer is
completely submerged.

Intake tubing is nicked or has a small hole.

Replace with new tubing.

Worn roller assembly and/or pump tubing.

Replace assembly and/or tubing.

Inaccurate Sample
Volumes

The volume was calibrated incorrectly the
first time.

Make sure the proper calibration method is used for
the site conditions (Auto or Timed calibrate).

Incorrect intake tube length is programmed in
the sampler.

Re-enter the tube length.

Intake tubing is not completely purging.

Place the tubing at a downward slope from the
sampler to the liquid source.

Anchor stainer is intermittently submerged.

Install the shallow depth anchor strainer,
(Cat. No. 2071 or 4652).

Worn roller assembly and/or pump tubing.

Replace assembly and/or pump tubing.

When using “Timed Calibrate” (liquid sensor
disabled) variable lifts will cause variable
sample volumes.

Enable sensor and calibrate volume if site
conditions allow.

Liquid sensor is not functioning properly.

Check the liquid diagnostics screen for valuable
information about sensor sensitivity.

RPM’s of the motor vary.

Replace motor if necessary.

Submerged
Pressure Sensor
level readings are
inaccurate or no
change in level
readings.

Improper calibration.

Make sure the unit has been calibrated.

Desiccant is pink.

Replace the desiccant.

The sensor was not acclimated to the air
temperature before calibrated.

Re-calibrate the sensor making sure the sensor is at
ambient temperature.

Water or debris in the atmospheric
reference tube.

Clean the area and re-calibrate. To reduce debris on
the cable and mounting band, route the cable along
the edge of the band and wrap the cable and
mounting band with plastic tape. The cable should exit
at or near the top of the pipe to keep it out of the flow
stream.

Level is trending downward because debris at
the diaphragm.

Remove the plate and carefully clean the transducer.
Re-calibrate the sensor.

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