3. SETTING UP
3.1 Preview
This section describes the settings available from the front panel. Factory settings have been
chosen to suit the general application of the instrument, or in accordance with the particular
instructions specified previously by the user.
3.2 On Power Up
IMPORTANT: Before operating the Instrument, ensure all the relevant installation
checks have been carried out [refer to Section 2.9], and that if a filter column is
fitted, it is properly charged with the chemical supplied.
Immediately after power is applied, the display presents a screen for 10 seconds. This page
contains the software version number.
If the logo does not appear on the screen within 20 seconds of applying power, try
adjusting the ‘LCD’ control, using a 2mm flat bladed screwdriver through the labelled
hole in the rear panel.
The next screen is the main display, which will show the measured value(s), units and the Gas
type, sample flow status and key functions.
The measured value is initially replaced with a symbol of a thermometer until the instrument
has warmed up.
Pressing the key labelled ‘Set Up’ displays a second screen showing the gas(s) measured
together with the range and units.
3.3 Zero & Span Operations.
Before precise gas readings can be obtained, the analyser must be adjusted so that it reads
zero when there is no trace of the measured gas present, then, when a known concentration of
the gas is applied, the reading is adjusted to agree with this concentration. These adjustments
are known as ‘zero’ and ‘span’ respectively.
The gases used for zero and span adjustment are supplied through the inlets at the back of the
instrument (see section 2.7), and electrically operated valves are used to route the appropriate
gas in place of the sample automatically when zero or span adjustment is selected using the
front panel controls.
'How often' to Zero or Span varies with each instrument. The interval required depends on how
much re-adjustment is being carried out: this can be established by noting the discrepancy of
the displayed value prior to resetting.
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