HACH LANGE 9185sc User Manual

HACH LANGE 9185sc User Manual Manual pdf 31 page image

29Section 6 Troubleshooting6.1 Error MessagesNote: When an error occurs, the measurement values are replaced by dashes, (- - -).6.2 Warning MessagesMessage Type Error Message SolutionMeasurement-relatedError MessagesCONC TOO HIGH Check the current value, along with the calibration parameters. Checkelectrode.CONC TOO LOW Check the current value, along with the calibration parameters. Checkelectrode.TEMPERATURE ERROR Check for short-circuit or open circuit.INT. TOO LOW Negative current. Check the electrode (electrolyte and membrane).INT. TOO HIGH Ensure that there are no short-circuits on the measurement chain.Check the polarizing voltage.***** on the main display No communication. Verify the connection and the cable. Test the 12Vpower supply.(At Connection time:) SENSORMISSINGFFFFFFFFFFFFF displaysNo communication. Verify the sensor is properly connected to thetransmitter. Verify that the cable is not damaged. Test the 12V powersupply. Open the sensor and change the board.COMMUNICATION ERROR Open the sensor and verify that there is no humidity.TEMP TOO LOWTemperature measurement is below –2°C. Verify that the actualtemperature is not below –2°C. Verify the internal resistance of theNTC/K, which must be around 10 K. Connect the sensor simulator andverify the RAW value.TEMP TOO HIGH Verify the actual temperature is not higher than 45 °C. Connect thesensor simulator and verify the RAW value.RAW MEASURMENT Change the preamplifier.PH TOO LOW (9184sc only) PH electrode is clogged, broken or too old. Calibrate the pH electrode.Clean the electrode. Replace the electrode.PH TOO HIGH (9184sc only) PH electrode is clogged, broken or too old. Calibrate the pH electrode.Clean the electrode. Replace the electrode.Calibration-relatedError MessagesΔT OUT OF LIMITSThe temperature difference between calibration and the theoreticalsensor response is greater than the allowed limit. Limits: ±20 °C. Checktemperature calibration (see 4.6.1 Temperature Sensor Calibration),OUT OF 4/20 mA The measured value is out of the programmed scale range for analogoutputs 1 and 2.Warning Display Problem ResolutionCAL FAIL SLOPELOWSlope is outside the limits.Adjust so that it is within the limits by checking zero cal, ensuring theproper flow rate, and validating that it’s clean. Be sure to put in theactual value and not the offset value when adjusting.CAL FAIL SLOPEHIGHAdjust so that it is within the limits by checking zero cal, ensuring theproper flow rate, and validating that it’s clean. Be sure to put in theactual value and not the offset value when adjusting.CAL TOO OLDThe last calibration was morethan x days ago. (Setting fromthe sensor setup)Calibrate the sensor.Set the calibration interval in the sensor setup.