Hach 1720E, User Manual

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Section 7 Troubleshooting
7.1 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 the
sensor will be held.
Highlight the Probe Diag menu and press
ENTER
. Highlight Errors and press
ENTER
to
determine the case of the error. Errors are defined in Table 3 .
7.2 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. Highlight the Probe Diag
menu and press
ENTER
to determine the cause of the error. Warnings are defined in
Table 4 .
A warning may be used to trigger a relay and users with the sc100 controller can set
warning levels to define the severity of the warning (see the sc100 controller user manual
for more information about warning levels). Errors are defined in
Table 4 .
Table 3 Error Codes
Displayed Error Definition
A/D Fail Failed A/D converter. Call the Service Department.
Lamp Fail
The light source has failed. See section 6.4.3 on page 25 for instructions for
replacing it.
Flash Fail Datalog and event log will not work.
Table 4 Warning Codes
Warning
Number
Displayed Warning Definition/Resolution
1 Dark Reading Warning Dark reading detects too much light. (> 0.05 NTU)
2 Temp Warning
Sensor head internal temperature is higher than specified. Contact the Service
Department. (> 70 °C)
3 Data Log Full
Sensor data log is full. No additional data will be logged until sensor log is
downloaded into controller memory.
4 Event Log Full
Sensor data log is full. No additional data will be logged until sensor log is
downloaded into controller memory.
5 5 Volt Warn Monitored voltage is outside the range of 4.5–5.5 V.
6 Inp V Warn Monitored voltage is outside the range of 9.08–14.13 V.
7 Lamp Volt Warn Monitored voltage is outside the range of 3.96–4.48 V.
8 Lamp Curr Warn Monitored current is outside the range of 1.67–2.75 Amps.
9 Output Mode Warn
Activated when the sensor is not in normal measurement mode (such as when
in calibration or verification mode).