LumaSense Technologies INNOVA 1314i - Manual (Page 99)

Chapter 9
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BE6030-13 1314i Photoacoustic Gas Monitor LumaSense Technologies A/S
Page 99 of 199
In order to fully understand the functioning of the Monitor it is
necessary to know something about the different types of memory
the Monitor uses, the kind of data stored in each type of memory,
and how this data is affected by the various operations performed by
the Monitor.
Offline users may find the information in this chapter of interest as
their measurement data is stored in the Monitor’s memory before
being uploaded to the PC.
9.1 Types of Memory in the Monitor
The Monitor has three types of memory:
1. A Read Only Memory (ROM);
2. An Electrically Erasable Programmable Read Only Memory
(EEPROM), which we have named the Source Memory;
3. A Random Access Memory (RAM) which we have named the
Working Memory.
9.1.1 Read Only Memory (ROM)
Data stored in this memory cannot be changed by the user. The
Optical Filter Factors, which describe each of the optical filters,
which are available for installation in the Monitor, are stored in this
memory. These factors are listed in a print-out of the “Calibration
Data Block” (see section 10.7 ).
When optical filters are installed in the carousel wheel, the Monitor
must be informed about:
· Which filters have been installed in its carousel (UA numbers of
the filters);
and
· Where they have been installed (position “A” – “E” of the
carousel – see section 12.3.3 ).
This information allows the Monitor to read the correct optical filter
factors from its ROM memory when the filter is installed. As these
factors are used in the calculation of calibration factors, it is vitally
important that this information is correctly entered before
calibration is performed.