Hach-Lange 5740 sc - Manual (Page 25)

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Section 6 Troubleshooting
6.1 Error Codes
When a sensor is experiencing an error condition, the sensor reading on
the measurement screen will flash and all relays and analog outputs associated with this
sensor will be held. The following conditions will cause the sensor reading to flash:
• Sensor calibration
• Relay timer washing cycle
• Loss of communication
Select the SENSOR STATUS menu and confirm. Select ERRORS and confirm to
determine the cause of the error. Errors are defined in Table
3 .
6.2 Warnings
A sensor warning will leave all menus, relays, and outputs functioning normally, but will
cause a warning icon to flash on the right side of the display. Select WARNINGS and
confirm to determine the cause of the warning.
A warning may be used to trigger a relay and users can set warning levels to define the
severity of the warning.Warnings are defined in Table
4 .
Table 3 Error Codes
Displayed Error Definition Resolution
ADC FAILURE A/D conversion fails. Call the Service Department.
SENSOR PUNC Sensor punctured. Replace sensor cartridge. 1
1 Replacement of the cartridge will reset the read out.
Table 4 Warning Codes
Displayed Warning Definition Resolution
PROBE OUT RANGE
No probe connected or measurement reading is out of
range. Check the DO range and ensure that it is
within 0–40 ppm.
TEMP OUT RANGE
No temperature element connected or temperature
reading is out of range. Check the temperature range and ensure
that it is within –20 °C to 200 °C.
FLASH FAILURE Cannot write flash memory. Call the Service Department.
CAL REQUIRED Past the calibration days since last calibration date. Calibrate the sensor.
REPLACE SENSOR Past the total days of current sensor in use. Install new sensor.