Hach-Lange 3400 sc - Manual (Page 29)

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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 7: "Error Codes" .
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 8: "Warning Codes" .
Table 7: Error Codes
Displayed Error Definition Resolution
ADC FAIL ADC reading bad Contact Customer Service
SENSOR FAIL Sensor ADC reading bad Contact Customer Service
FLASH FAIL Failed operation on Flash Memory Contact Customer Service
Table 8: Warning Codes
Displayed Warning Definition Resolution
TEMP < –20 °C
The sensed temperature is below –20 °C
(–4 °F).
Temperature out of Range: Increase process temperature
or discontinue use until the process temperature is above
–20 °C (–4 °F).
Bad Temperature Sensor: Check temperature of the
sample stream with an independent temperature
measuring device. If the temperature is within range,
contact the Technical Consulting Services Department.
TEMP > 200 °C
The sensed temperature is above 200 °C
(392 °F).
Temperature out of Range: Decrease process temperature
or discontinue use until the process temperature is below
200 °C (392 °F).
Bad Temperature Sensor: Check temperature of the
sample stream with an independent temperature
measuring device. If the temperature is within range,
contact the Technical Consulting Services Department.