What does 'U-Sonic Echo Loss' mean on Hach 900 MAX and how can I resolve it?
The 'U-Sonic Echo Loss' error means that the echo has been temporarily deflected by a change in site conditions, such as floating debris, foam in the channel, or wind. Check for excessive foam and remove any debris or build-up.
Why does Hach Laboratory Equipment display 'Tried to enable Storm Water with a single bottle'?
This message appears because Stormwater mode is not allowed when the sampler is configured with only one bottle. Use multiple bottles to enable Stormwater mode.
Why does Hach 900 MAX show 'U-Sonic Failure' and how to fix it?
A 'U-Sonic Failure' message indicates that the transducer is either not plugged in, the cable is damaged, or the transducer thermal sensor is damaged. Verify that the transducer is correctly plugged in and inspect the sensor for any signs of damage.
What does 'The signal did not stabilize in time—calibration failed' mean on Hach 900 MAX Laboratory Equipment and how to fix it?
This message appears when calibrating pH, process temperature, ORP, D.O., D.O. temperature, conductivity, or conductivity temperature, and the signal from the probe did not respond within the calibration time limits. Replace buffer solutions (if applicable) or try another probe.
What does 'The program setup needs rain to be logged at an interval < or = the rainfall time limit' mean on Hach Laboratory Equipment and how to resolve it?
This message indicates that an alarm, setpoint, or stormwater function uses rainfall as a trip point, and the logging interval is not adequate. Adjust the logging interval to meet the requirements.
Why does Hach 900 MAX Laboratory Equipment display 'Upset sampling is not allowed when the sampler is configured with one bottle'?
This message appears when you try to enable Upset Sampling with a single bottle. Use multiple bottles to enable Upset Sampling.
What causes 'Low Slate Memory' on Hach 900 MAX Laboratory Equipment and how to fix it?
When free slate memory is less than 20%, the 'Low Slate Memory' error appears, indicating that RAM memory is almost full and will stop recording soon. To resolve this, you can download data from the unit, halt and restart the program. Another option is to download the data, halt the program, and change the data to wrap mode.
What to do if Hach 900 MAX Laboratory Equipment shows 'Slate Memory Full'?
If your unit is in slate memory mode and can't log any more data because there is no more slate memory, download the data and restart the program. Alternatively, download the data and then change the memory mode.
How to fix 'Low Main Battery' on Hach 900 MAX?
If the power supply voltage is less than 11 V dc, the 'Low Main Battery' error appears. To solve this, change the batteries.
What does 'Calibration requires a minimum submersion of six inches' mean on Hach 900 MAX?
This message relates to level sensor calibration of the bubbler or submerged sensor. Ensure a minimum submersion of six inches during calibration.
General| Brand | Hach |
|---|---|
| Model | 900 MAX |
| Category | Laboratory Equipment |
| Language | English |
Explains hazard signal words (Danger, Caution, Note) for understanding warnings.
Advises reading and observing all labels attached to the instrument for safety.
States the instrument is not approved for hazardous locations as defined by the National Electrical Code.
Covers dimensions, cabinet, thermal system, power, and control panel.
Details sampling modes, intervals, communication, and data logging.
Lists specifications for optional probes (pH, DO, ORP, Conductivity) and sensors.
Guides on unpacking and choosing an optimal installation site.
Guides on initial power-up, main menu, and basic programming steps.
Details setup steps for bottles, intake tubing, program lock, and sample collection.
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