Hach 900 MAX ユーザーズマニュアル

8990apdx_tbl.fm

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.