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3654 Portable H2/N2 Analyzer - Maintenance and Troubleshooting 53 of 66
Operator Manual
ORBISPHERE
6.6 Troubleshooting - Operation
6.6.1 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 Ultra 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.
6.6.2 Diagnostics Messages
The following are warning messages that may appear on the instrument LCD in place of
the gas concentration.
6.6.3 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.
Table 6-1: 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 19). If the problem per-
sists, contact your local Hach Ultra 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 36.