Appendix C

Trouble Alarm Conditions, Causes, and Solutions

Trouble Condition

Cause

Solution

 

 

 

Low Main Battery

Power supply voltage is less than 11 V dc.

Change batteries.

 

 

 

Memory Battery

Internal memory battery voltage is too low.

Change memory batteries.

 

 

 

 

Free slate memory is less than 20%. RAM

Download data from unit, halt and restart the

Low Slate Memory

memory is almost full and will stop

program or download data, halt, and change

 

recording soon.

data to wrap mode.

 

 

 

 

No more slate memory. Unit is in slate memory

Download data and restart the program or

Slate Memory Full

download data then change the

mode and cannot log any more data.

 

memory mode.

 

 

 

 

 

 

 

If the modem is enabled, the problem may be

Modem Failure

Unable to initialize modem PCB.

found on the modem board and the board

 

 

may need to be replaced.

 

 

 

Missed Sample

Sample cycle did not result in getting a sample.

 

 

 

Purge Failure

Sensor(s) still detecting liquid after a line purge.

 

 

 

Jammed Distributor

Distributor arm has jammed on an obstruction.

Remove obstruction

 

 

 

 

Refrigeration system is unable to reduce

 

Unable to Cool

temperature in refrigeration compartment to

 

user defined setpoint.

 

 

 

 

 

Heater is unable to increase temperature in

 

Unable to Heat

refrigeration compartment to user defined

 

setpoint.

 

 

 

 

 

The echo has been temporarily deflected by a

Check for excessive foam. Remove any debris

U-Sonic Echo Loss

change in site conditions such as floating debris

or build-up.

 

or foam in the channel, wind, etc.

 

 

 

 

 

Xducer Ringing

Transducer is operating within the deadband

 

 

 

U-Sonic Failure

Transducer not plugged in. Cable damaged.

Check that the transducer is plugged in and

Transducer thermal sensor damaged.

that there is no damage to the sensor.

 

 

 

 

 

Communication error between CPU and remote

 

ultrasonic module.

 

 

 

 

 

 

CPU is not communicating with the

Wait a few minutes to see if it goes away, if it

 

continues it is an indication that there is a

 

Velocity board.

 

problem with the CPU board.

RS485 Timed Out

 

 

 

 

If the logging interval is 1 or 2 minutes and

 

 

 

 

conditions are poor with the problem

 

Not receiving a good velocity reading.

continuing indefinitely, try increasing the

 

 

logging interval to allow more time to capture

 

 

the signal.

 

 

 

 

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Troubleshooting and Error Messages

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Hach 900 MAX manual Appendix C Trouble Alarm Conditions, Causes, and Solutions, Trouble Condition Cause Solution

900 MAX specifications

The Hach 900 MAX is an advanced analytical instrument designed to perform water quality analysis with precision and efficiency. This multiparameter water quality analyzer is tailored for a wide range of applications, including environmental monitoring, wastewater treatment, and industrial processes. Its unique design and technology make it a valuable tool for professionals in the field.

One of the standout features of the Hach 900 MAX is its ability to measure multiple parameters simultaneously. Equipped with advanced sensors, the device can analyze key water quality indicators such as pH, turbidity, dissolved oxygen, conductivity, and various chemical parameters. This comprehensive measurement capability allows users to gain a complete understanding of water quality in a single run, saving both time and resources.

The Hach 900 MAX utilizes cutting-edge technologies to provide accurate and reliable results. Its integrated optical sensors employ advanced photometry, which enhances the detection of chemicals in water samples with high sensitivity. Additionally, the device includes advanced calibration management tools that ensure consistent accuracy over time. Users can easily perform routine calibrations with minimal effort, facilitating reliable data collection.

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In addition to its analytical capabilities, the Hach 900 MAX emphasizes connectivity and data management. The instrument can be connected to laboratory information management systems (LIMS) and other data networks, enabling smooth data transfer and integration into existing workflows. This connectivity enhances collaboration among team members and facilitates compliance with regulatory requirements.

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Overall, the Hach 900 MAX stands out as a powerful and versatile tool in the realm of water quality analysis. With its multiparameter measurement capabilities, advanced sensor technologies, user-friendly interface, and reliable performance, it enables professionals to obtain accurate insights into water quality efficiently. As environmental concerns continue to grow, instruments like the Hach 900 MAX play a crucial role in ensuring the safety and sustainability of water resources.