Hach-Lange 9187 sc - Manual (Page 31)

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Section 6 Troubleshooting
6.1 Error Messages
Note: When an error occurs, the measurement values are replaced by dashes, (- - -).
6.2 Warning Messages
Message Type Error Message Solution
Measurement-related
Error Messages
CONC TOO HIGH
Check the current value, along with the calibration parameters. Check
electrode.
CONC TOO LOW
Check the current value, along with the calibration parameters. Check
electrode.
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 12V
power supply.
(At Connection time:) SENSOR
MISSING
FFFFFFFFFFFFF displays
No communication. Verify the sensor is properly connected to the
transmitter. Verify that the cable is not damaged. Test the 12V power
supply. Open the sensor and change the board.
COMMUNICATION ERROR Open the sensor and verify that there is no humidity.
TEMP TOO LOW
Temperature measurement is below –2°C. Verify that the actual
temperature is not below –2°C. Verify the internal resistance of the
NTC/K, which must be around 10 K. Connect the sensor simulator and
verify the RAW value.
TEMP TOO HIGH
Verify the actual temperature is not higher than 45 °C. Connect the
sensor 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-related
Error Messages
ΔT OUT OF LIMITS
The temperature difference between calibration and the theoretical
sensor response is greater than the allowed limit. Limits: ±20 °C. Check
temperature calibration (see
4.6.1 Temperature Sensor Calibration ),
OUT OF 4/20 mA
The measured value is out of the programmed scale range for analog
outputs 1 and 2.
Warning Display Problem Resolution
CAL FAIL SLOPE
LOW
Slope is outside the limits.
Adjust so that it is within the limits by checking zero cal, ensuring the
proper flow rate, and validating that it’s clean. Be sure to put in the
actual value and not the offset value when adjusting.
CAL FAIL SLOPE
HIGH
Adjust so that it is within the limits by checking zero cal, ensuring the
proper flow rate, and validating that it’s clean. Be sure to put in the
actual value and not the offset value when adjusting.
CAL TOO OLD
The last calibration was more
than x days ago. (Setting from
the sensor setup)
Calibrate the sensor.
Set the calibration interval in the sensor setup.