LumaSense Technologies 3434i SF6 Leak Detector - Manual (Page 167)

Chapter 12
______________________________________________________________________
_____________________________________________________________________________
BE6028-14 3434i SF6 Leak Detector LumaSense Technologies A/S
Page 167 of 191
A : µ : 123.8 μV σ : 617 nV 6 40.4 °C
PRESS ENTER WHEN RESULTS ARE STABLE
These results have been shown on the data-log print-out. If they
have stabilised continue to the next Step.
4. Press ¿ .
The text CALCULATING CALIBRATION FACTORS – PLEASE
WAIT appears on the screen.
The Monitor only uses the last six measurement results when
calculating any calibration factor. The conversion factor (in mg/m3
per volt), which is calculated during a span calibration, is the factor
which allows the Monitor to relate the signal produced by the gas to
the concentration of gas in the cell.
If any calibration data is doubtful or unacceptable an error message
(marked by an asterisk) will appear on the screen after the
calibration factors have been calculated. Whenever an asterisk is
shown on the screen further information about the condition of the
Monitor can be obtained by pressing the INFO button.
Chapter 13 lists all the error messages connected with doubtful
calibration results and gives an explanation of their significance so
that the user can ascertain what action to take if such messages are
displayed after calibration.
12.9 Calibration of the Water-vapour Filter – Stand-
alone Use
The water-vapour filter has two different functions. Its most
important function is to enable any measured signal to be
compensated for water-vapour interference. Its other function is to
measure the absolute concentration of water-vapour in air samples.
If you only wish to use the water-vapour filter to compensate for
water-vapour interference, then it only has to be zero-point
calibrated. If you wish to use it to measure the absolute
concentration of water vapour in air samples then it has to be zero-
point calibrated and span calibrated.
It is vitally important to accurately zero-point calibrate the water-
vapour filter as this influences the Monitor’s ability to compensate for
interference from water vapour. This demands that the zero-gas you
use during the zero-point calibration of the filter must be perfectly
dry.