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@IST01530EEJ 019175A0 190411
Low-level alarms are triggered when the reading drops below the defined threshold, whereas high-level alarms
are triggered when the reading rises above the defined threshold. When an alarm threshold is crossed, the
instrument emits an intermittent audible alarm besides activating a visible alarm wherein the background of the
name of the relative reading will start flashing in the analysis screen. When the CO and NO concentration
thresholds are crossed, besides activating the audible and visible alarms, the CO and NO solenoid valves may
also be set to intervene and thereby interrupt sample flow. If the instrument is not fitted with a solenoid valve,
the sample pump will in any case be stopped.
Buzzer
This sub-menu allows the operator to activate or deactivate the instrument buzzer.
NOx/NO Factor
NOx/NO: all the nitrogen oxides which are present in the flue emissions (Nitrogen oxide = NO, Nitrogen dioxide
= NO
2
); total nitrogen oxides = NOx (NO + NO
2
).
In the combustion processe s, it is found out that the NO
2
percentage contained in the flue gas are typically not
far from very low values (3%); hence it is possible to obtain the NOx value by a simple calculation without using
a direct measurement with a further NO
2
sensor.
The NO
2
percentage value contained in the fumes can be however set at a value other than 3% (default value).
Operator:
The name of the operator conducting the analysis may be set or modified through this submenu. A maximum of
three names may be stored. The name of the selected operator will be printed on the analysis report.
Report header setup:
This allows the Company or Owner’s name to be entered in four lines with 24 characters each, together with
other details (e.g. address, tel. no.). This data will be printed on the heading of the analysis report.
Micromanometer
Allows to configure the micromanometer input (optional) as P+ or P– port. In case P– is selected, the sign of
pressure is inverted.
Language
This sub-menu permits to select the desired language for the visualization of the various menus and the report
printing.
Calibration
It is possible to make a recalibration of the instrument’s gas sensors with suitable known concentration gas
cylinders. Recalibration of Oxygen (O2) sensor is not availbale since it is already recalibrated during every
autozero sequence. See 'MAINTENANCE' section.
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