LumaSense Technologies INNOVA 1412i - Manual (Page 104)

Chapter 9
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BE6025-15 1412i Photoacoustic Gas Monitor LumaSense Technologies A/S
Page 104 of 202
factors which are calculated during the calibration procedure. This is
done by selecting a FILTER BANK NO. – in the active set-up for
Filter A each time the filter is calibrated. For example, Filter Bank
No.”1” for storage of the calibration factors for sulphur hexafluoride,
Filter Bank No.”2” for acetic acid and Filter Bank No.”3” for vinyl
chloride.
After calibration of the filter UA 0976 the Monitor is able to
accurately monitor any of the three gases mentioned – but only one
of these gases during any particular monitoring task. By selecting the
correct FILTER BANK NO. in the set-up of the Monitor before a
monitoring task is started, the user determines which calibration
factors will be used during the task and therefore the kind of gas
monitored by filter A. For example, when Filter Bank No.”3” is
entered in the active set-up for filter UA 0976 in position ”A”, the
Monitor reads the calibration factors from file “A3” into its Working
Memory so that the concentration of vinyl chloride can be calculated
during the monitoring task.
Block 2 – Optical Filter Set-up Parameters:
This block contains 3 of the 6 parameters, which describe the optical
filter installed in each position of the filter carousel:
UA number of the filter;
Filter bank number;
S.I.T. information;
If any of the above-listed parameters are changed in the active set-
up they are also automatically changed in the Source Memory.
Block 3 – Other Set-Up Parameters:
This block of data contains all set-up parameters except the optical
filter parameters. Before leaving the factory the parameters in this
block are given factory-set values. These are the values obtained for
a parameter when the Default button is pressed.
9.1.3 Working Memory (RAM)
The Working Memory is a “volatile” memory, that is, data will be
lost from it if electric power is removed from the Monitor. When the
Monitor is not connected to a mains power supply a lithium battery in
the Monitor provides a back-up power supply to protect the data in
this memory. When this battery is no longer providing enough power
a warning BACK-UP BATTERY TOO LOW will appear on the
Monitor’s display to indicate that the battery needs to be replaced by
a new one.