E Instruments 4400, Руководство пользователя

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4.9 Configure Menu
This menu is used to configure the instrument’s reference parameters described below:
Fuel:
Lets the user select the type of fuel to be used during analysis. This datum can be changed either from this
menu or during the analysis itself.
Measurement units:
Through this submenu the user can modify the units of measurement for all the analysis parameters, depending
on how they are used.
O
2
Reference:
In this mode the user can set the oxygen percentage level that pollutant emission values are corrected to for
that given O2 reference level.
Display contrast:
The display contrast may be increased or decreased by acting on cursor keys . This operation may be
performed even when the introductory screen is active.
Autozero/Pump:
This submenu is used to set the duration of the analyzer auto-calibration cycle. It may also be used to switch off
or switch on the sample pump temporarily. The sample pump cannot be switched off if the auto-calibration cycle
is under way.
CO Auto-Dilution:
The CO sensor is protected by a pump which, in case of need, can inject clean air in the gas path in order to
dilute the gas concentration measured by the sensor. This function can be either triggered by the overcoming of
a CO concentration threshold which can be set by the user or, in case it is known that the flue gases contain
high CO concentration, kept enabled any time, independently of CO concentration.
WARNING: CO Auto-Dilution feature must only be considered as a means of protection for CO sensor,
as its activ ation heavily deteriorates both accuracy and resolution of the CO measurement.
Automatic analysis:
The user can set analysis mode to either manual or automatic.
In manual mode the user performs the three necessary analysis operations manually. In automatic mode the
cycle duration for each reading must also be set - in this case the instrument will conduct each analysis in the
specified time.
Printing may also be manual or automatic. If “auto” printing is selected, the instrument will automatically print the
analysis report in a predetermined format at the end of the automatic analysis.
If ' auto ' printing is selected also at the end of a tightness te st a report will be printed automatically.
Condensation
The burner efficiency figure when condensation takes place is influenced by atmospheric pressure and humidity
of the combustion air. As the atmospheric pressure is hardly precisely known, the operator is asked to enter a
related parameter, i.e. the altitude of the place above the sea level, from which the pressure is then derived
once the dependency from atmospheric conditions is neglected. In calculations the value of 101325 Pa is
assumed as atmospheric pressure at sea level. Further the air relative humidity input is allowed, being this
calculated at the combustion air temperature as measured from the instrument; in case this value is unknow the
operator is recommended to enter 50% for this value.
Time/Date:
This allows the current time and date to be set. The user can select the date and hour format either in EU
(European) or USA (American) mode.
Alarms:
This submenu allows the user to set and memorise 5 alarms, defining the monitored parameter for each, the
alarm threshold and relative unit of measurement and whether it is a low or high-level alarm.
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