HACH LANGE ORBISPHERE 3654, User Manual, Page: 51 / 58

49
Maintenance and Troubleshooting
8.5.6 Measurements view
8.6 Troubleshooting - operation
8.6.1 Program identification
In case of problems, it may be necessary to check the current version of your software as this
may be required by Hach Lange if you need to contact them for assistance in problem solving.
To identify the version of the software in your instrument, switch off the instrument. Then hold
down the
MEAS
button while switching the instrument back on. The instrument will then briefly
display the software version number before going through it’s start-up procedures.
8.6.2 Diagnostic messages
The following are warning messages that may appear on the instrument LCD in place of the gas
concentration.
8.6.3 Continuous purge
It may be useful, particularly when seeing a
[
Pur
]
error message on your display, to view the
purge voltage of the TC sensor in a continuous purge mode. In this mode, there is no
purge/measurement cycle, as the purge gas is flowing through the sensor continuously.
To start continuous purge mode, put the instrument into standby, then hold down the
Down
Arrow
button while switching the instrument back on again. The instrument displays
[
Pur
]
,
followed by the purge gas voltage.
At 20-25°C, this voltage should be about 3.00V (± 200 mVolt) for H
2
/N
2
measurements.
To exit from continuous purge mode, put the instrument in standby, then switch back on again
without holding any keys.
The
Troubleshooting
,
Measurements View
confirms, on your PC monitor, what your analyzer
should be displaying on the LCD for gas
concentration and sample temperature.
Choose
Cancel
to exit from this display.
Table 5 Diagnostic messages
Message Meaning
Pur
This message appears on the LCD if the purge gas supply fails. To detect this condition,
the voltage signal from the TC sensor is measured. This is normally between 1-3 volts,
depending which gas is being measured.
If the flow of purge gas stops, the sensor voltage wanders outside the permitted range of
100mV to 4 V. See also
Continuous purge below.
Out
This message appears if the sensor is unplugged from its correct position, or if the
temperature is outside the range -5°C to 100°C.
Err
During start-up, this message indicates the instrument cannot complete the start-up tests
successfully (see
Taking measurements on page 18 ). If the problem persists, contact your
local Hach Lange service representative for assistance.
During calibration, this message indicates that the partial pressure of gas is below the
acceptable range (<5 mbar), or that you have pressed a wrong key, as explained in
Sensor
calibration on page 33 .