Appendix C

Downlook Ultrasonic Sensor Troubleshooting

Problems

Causes

Solutions

 

 

 

 

 

Wait a few minutes and see if the condition

RS485 Time Out—Did not get a

CPU is having trouble communicating

goes away. If it continues there amy be a

reading with the specified time

with the Ultrasonic board.

problem in the Ultrasonic, Velocity, or

allotted.

 

CPU board.

 

Difficulty receiving a velocity reading.

Indicates an internal problem.

 

 

 

 

 

Replace fuse. The fuse is located in position

Loss of Ultrasonic as Level

Blown fuse on CPU board.

F1 under the gray ribbon cable that connects

Measuring Device.

 

at position J1.

 

Problem with the ultrasonic board.

Replace if necessary.

 

 

 

 

Excessive foam on the water surface

 

 

causes sound waves to be absorbed

Check for excessive foam.

 

rather than reflected.

 

 

 

 

 

Sensor is knicked or cut or improperly

Check for knicks, cuts, and the

 

installed.

sensor installation.

 

 

 

U-Sonic Echo Loss—Flow Meter

Sensor must be level for proper return

Make sure the ultrasonic transducer is level.

of signals.

Not Receiving a Return Echo

 

 

 

 

Try shielding the transducer from convection

from the Ultrasonic Transducer.

Convection currents are present which

 

currents. Echo loss should not exceed more

 

varies the speed of sound.

 

than two hours.

 

 

 

 

 

 

Temperature calibration set up incorrectly.

Go through the temperature calibration

 

Extreme high or low temperature

procedure and determine what the

 

indicates a bad temperature transducer in

temperature the unit is sensing. Replace

 

the temperature sensor.

transducer if necessary.

 

 

 

 

Transducer is not connected.

Check the ultrasonic sensor connection on the

 

flow meter.

U-Sonic Failure—No Signal from

 

 

 

Cut or broken cable.

Check for any knick or cuts in the cable.

the Ultrasonic Transducer.

 

 

Unusual temperature or inability to read

Re-calibrate the unit.

 

 

new calibrated level.

 

 

 

 

 

 

Liquid is too close to the transducer.

Try moving the transducer farther from the

 

liquid.

 

 

 

 

 

 

Obstructions under the transducer.

Check for obstructions on the front and sides

 

of the transducer.

 

 

XDucer Ringing—False Return

 

 

 

Clean the transducer face. If this is a constant

Echo mask Real Echoes.

Coating on the face of the transducer.

problem, try coating the face of the transducer

 

with a very thin film of silicone grease to keep

 

 

 

 

the debris from collecting.

 

 

 

 

The transducer resonates against steel

Use the proper rubber isolation washers.

 

mounting rails.

 

 

 

 

 

 

 

Check the logged data to see when this

No Change in Level Readings or

—

started to occur. Go to the event log to see if

 

anything happened during the same time.

Inaccurate Level Readings.

 

 

Calibration

Re-calibrate the unit.

 

 

 

 

 

Bad transducer.

Try a different transducer.

 

 

 

Page 130

 

Troubleshooting and Error Messages

8990apdx_tbl.fm

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Hach 900 MAX manual Appendix C Downlook Ultrasonic Sensor Troubleshooting, Problems Causes Solutions
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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.

Another notable characteristic of the Hach 900 MAX is its user-friendly interface. The instrument features a large, touchscreen display that allows for intuitive navigation through various settings and parameters. Users can quickly access real-time data, generate reports, and analyze trends using the built-in software. The ability to customize dashboards and create visual representations of data enhances user experience and simplifies the decision-making process.

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.

Durability is another hallmark of the Hach 900 MAX. The device is designed for use in demanding environments, with robust construction and protection against dust and moisture. This reliability ensures that the analyzer remains operational even in challenging conditions, making it suitable for field applications.

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.
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