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Jose GarciaAug 18, 2025
What to do if my Hach Accessories say 'CAL OVERDUE'?
- BBarbara UnderwoodAug 18, 2025
If your Hach Accessories display a 'CAL OVERDUE' message, you should calibrate the sensor.
What to do if my Hach Accessories say 'CAL OVERDUE'?
If your Hach Accessories display a 'CAL OVERDUE' message, you should calibrate the sensor.
What to do if my Hach Accessories say 'NOT CALIBRATED'?
If the Hach Accessories show 'NOT CALIBRATED', you should calibrate the sensor.
What does 'REPLACE SENSOR' mean on my Hach Accessories, and what should I do?
If the Hach Accessories display 'REPLACE SENSOR' because the sensor has been in operation for more than 365 days, calibrate the sensor with a reference solution and reset the sensor days. If the calibration fails, call technical support.
What to do if my Hach Accessories displays 'ADC FAILURE'?
If the Hach Accessories show 'ADC FAILURE' because the analog to digital conversion failed, ensure that the sensor module is fully inserted into the controller connector. If the issue persists, replace the sensor module.
Why is my Hach Accessories showing 'SENS OUT RANGE'?
The Hach Accessories display 'SENS OUT RANGE' because the sensor signal is outside of the accepted limits for the cell constant that is used. To resolve this, make sure that the sensor is configured for the correct cell constant.
What to do if my Hach Accessories show 'MEAS TOO HIGH'?
If the Hach Accessories show 'MEAS TOO HIGH' because the measured value is > 2,000,000 µS/cm, 1,000,000 ppm or 20,000 ppt, make sure that the sensor is configured for the correct cell constant.
What to do if my Hach Accessories show 'MEAS TOO LOW'?
If the Hach Accessories display 'MEAS TOO LOW' because the measured value is < 0 µS/cm, 0 ppm or 0 ppt, make sure that the sensor is configured for the correct cell constant.
What does it mean when my Hach Accessories say 'OUTPUTS ON HOLD'?
If the Hach Accessories display 'OUTPUTS ON HOLD', the outputs will become active after the selected time period.
What does 'ZERO TOO HIGH' mean on my Hach Accessories?
If the Hach Accessories display 'ZERO TOO HIGH' because the zero calibration value is > 500,000 counts, make sure that the sensor is held in air during zero calibration and is not located near radio frequency or electromagnetic interference. Also, ensure that the cable is shielded by metal conduit.
Why is my Hach Accessories showing 'TEMP TOO HIGH'?
The Hach Accessories display 'TEMP TOO HIGH' because the measured temperature is > 130 °C. To resolve this, make sure that the sensor is configured for the correct temperature element.
Important safety notices and precautions for using the equipment.
Explanation of hazard symbols (DANGER, WARNING, CAUTION) and their meanings.
Detailed instructions and warnings for mounting the sensor in various configurations.
Table detailing sensor wire connections to the controller module pins.
Detailed list of sensor settings and parameters to configure for optimal performance.
Steps for zero calibration and calibration with reference or process samples.
Detailed steps for cleaning the sensor to ensure optimal performance and lifespan.
General| Parameter | Silica (SiO₂) |
|---|---|
| Sample Temperature | 5-40°C |
| Power Supply | 100 – 240 VAC, 50/60 Hz |
| pH Range | Not applicable |
| pH Accuracy | Not applicable |
| Conductivity Range | Not applicable |
| Conductivity Accuracy | Not applicable |
| Temperature Range | 5-40°C |
| Display | Graphical display with backlight |
| Outputs | Two 0/4 – 20 mA isolated current outputs Two alarm relays Modbus RTU/TCP |
| Operating Temperature | 5 – 45 °C (41 – 113 °F) |
