Hach 900 MAX manual Appendix C, Problem, Cause, Solution, Page, Troubleshooting and Error Messages

Appendix C

Sigma 900 MAX Refrigerated Sampler Troubleshooting Issues

Problem	Cause	Solution
	Blown Fuse.	Check the 5-amp fuse on the back of the controller.
Instrument Will Not
	Circuit breaker issue.	Check the circuit breaker for the main power.
Power Up With ac
	Breaker is good, but still no power.	Check to see if the outlet is receiving power.
Power.
	Breaker and outlet are good, still no power.	Try using a battery or another power supply
	If any holes on the anchor strainer are not	Make sure the anchor strainer is
Sampler Will Not	submerged the sampler will not create a lift.	completely submerged.
Create Sufficient Lift.	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.
	The volume was calibrated incorrectly the	Make sure the proper calibration method is used for
	first time.	the site conditions (Auto or Timed calibrate).
	Incorrect intake tube length is programmed in	Re-enter the tube length.
	the sampler.
	Intake tubing is not completely purging.	Place the tubing at a downward slope from the
		sampler to the liquid source.
Inaccurate Sample	Anchor stainer is intermittently submerged.	Install the shallow depth anchor strainer,
		(Cat. No. 2071 or 4652).
Volumes
	Worn roller assembly and/or pump tubing.	Replace assembly and/or pump tubing.
	When using “Timed Calibrate” (liquid sensor	Enable sensor and calibrate volume if site
	disabled) variable lifts will cause variable
		conditions allow.
	sample volumes.
	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.
	Improper calibration.	Make sure the unit has been calibrated.
	Desiccant is pink.	Replace the desiccant.
	The sensor was not acclimated to the air	Re-calibrate the sensor making sure the sensor is at
Submerged	temperature before calibrated.	ambient temperature.
Pressure Sensor
		Clean the area and re-calibrate. To reduce debris on
level readings are
		the cable and mounting band, route the cable along
inaccurate or no
	Water or debris in the atmospheric	the edge of the band and wrap the cable and
change in level
	reference tube.	mounting band with plastic tape. The cable should exit
readings.
		at or near the top of the pipe to keep it out of the flow
		stream.
	Level is trending downward because debris at	Remove the plate and carefully clean the transducer.
	the diaphragm.	Re-calibrate the sensor.

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Troubleshooting and Error Messages	8990apdx_tbl.fm