Turbidity Sensor Troubleshooting Methods

If the water quality detector is not calibrated, it will often have problems, but if it is not calibrated according to the regulations, it is also prone to problems, such as negative values ​​when calibrating turbidity, and other error messages. Therefore, if you want to calibrate the water quality instrument with good turbidity, you must understand the corresponding treatment methods in case of failure. For this reason, we have summarized the troubleshooting methods for the turbidity sensor of the water quality testing instrument. Troubleshooting Tips for Turbidity Water Quality Sensors: Turbidity water quality detector sensors are generally durable. Using proper storage and maintenance practices on a daily basis can help prolong the life of the sensor. But if there is an error message during the calibration of the turbidity sensor, please check the following: 1. Make sure that the turbidity calibration solution has not expired and ensure its quality. 2. The calibration environment (such as calibration cup, sensor shield and sensor) should be kept in good condition. If you have problems with negative turbidity readings, refer to the instruction manual. 3. There should not be any reflective material on the sensor shield and calibration cup. The bottom of the metal sensor shield (inside; facing the sensor) should be free of any scratches. 4. If you suspect port contamination, remove the sensor and follow the instructions in the Cleaning the sensor port section. How to prevent negative readings from turbidity water quality sensors: Generally, when calibrating, a negative reading from a turbidity sensor is always associated with a calibration value of '0'. Although everyone follows the calibration procedure exactly, it is sometimes impossible to clean the sensor, calibration cup, and sensor shield to a '0' calibration value. Even in a laboratory environment, brand new instruments can exhibit 0-0.1 FNU contamination. Whereas a used turbidity sensor may be close to 1.0 FNU after cleaning. Therefore, when we encounter this situation, we can use the method of setting the calibration value to avoid it. For example, generally everyone enters the calibration value as 0, but the actual reading is mostly 0.6FNU. If the turbidity of the calibration environment is 0.3 FNU , the reading of the water quality detector is likely to show a measured value of -0.3FNU. Therefore, when you calibrate the sensor of the turbidity water quality detection instrument, in addition to avoiding the pollution of the sensor itself and the calibration tool, you must also specify the calibration value. Generally, we recommend that you set the calibration value from 0 to 1FNU. Also the following tips can help eliminate negative turbidity readings: 1. Use a calibration cup and sensor shield designed for calibration. Calibration cups and sensor guards can easily become contaminated over time, especially if the instrument is measuring poor water quality samples or in the field. 2. Zero turbidity standards have very little contamination provided the instrument is properly cleaned and maintained. Generally, the average pollutant level ranged from 0.2 to 0.8 NTU. Knowing this, you can pick a number (0.5) between these points and enter that as the first calibration point. 3. Calibration for turbidity is best done in a laboratory setting; field calibration may result in erroneous readings. Generally a negative reading of a turbidity sensor during calibration is always associated with a calibration value of '0'. Although everyone follows the calibration procedure exactly, it is sometimes impossible to clean the sensor, calibration cup, and sensor shield to a '0' calibration value. Even in a laboratory environment, brand new instruments can be contaminated with 0-0.1 FNU. Whereas a used turbidity sensor may be close to 1.0 FNU after cleaning. Therefore, when encountering this situation, we can use the method of setting the calibration value to avoid it. For example, generally everyone enters the calibration value as 0, but the actual reading is mostly 0.6FNU. If the turbidity of the calibration environment is 0.3FNU, The reading of the water quality meter is likely to show a measurement of -0.3FNU. Therefore, when you calibrate the sensor of the turbidity water quality detection instrument, in addition to avoiding the pollution of the sensor itself and the calibration tool, you must also specify the calibration value. Generally, we recommend that you set the calibration value from 0 to 1FNU.
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