LumaSense Technologies 3434i SF6 Leak Detector - Manual (Page 144)

Chapter 12
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BE6028-14 3434i SF6 Leak Detector LumaSense Technologies A/S
Page 144 of 191
17. Press ¿ and use p and q to display the desired Sample
Integration Time.
18. Repeat step 13 and 14 to enter the desired alarm levels.
19. Press ¿ , this returns you to the top of the Configuration Set-up
Tree.
12.3.4 Setting-up the Monitor to Print a Data Log
This is only necessary for those of you who do not use the Calibration
Software BZ7002 to calibrate the Monitor.
During calibration, the calibration gas is drawn into the cell and the
microphones measure the signal produced by the gas’s absorption of
light from the infra-red light source. As soon as a measurement is
made it is displayed on the Monitor’s screen. Measurement results
are constantly updated on the display, but only one set of meas-
urement results are displayed at a time, and no scrolling facility is
available to look at previously-displayed results. Therefore, your
Monitor should be set-up to print a “Data log” This is described fully
in section 10.5 .
12.3.5 Warming Up the Monitor
The infra-red light source is very hot and the temperature in the
analysis cell thus increases as calibration measurements proceed.
Conditions within the cell tend to stabilise more quickly once the
temperature inside the analysis cell is 15°C above the ambient room
temperature. We therefore suggest that you set-up the Monitor to
sample continuously, for a period of 30 – 40 min. to warm up the
analysis cell before a calibration task is started. This will reduce the
time required for calibration.
To warm-up the Monitor you need to set-up a monitoring task and
make the Monitor perform the task for a period of time. If you are
unsure about setting up and starting a monitoring task, full
instructions are provided together with an example in section 4.3 for
stand-alone use.
The Continuous warm function can also be used hence the warm up
starts on power on. (see section 5.6) .
12.4 The Basic Calibration Set-up
The general equipment required to perform the calibration is shown
in Fig.12.4 . Three different lengths of Teflon tubing are connected to
a “Y”-piece. The tube attached to point 1 is connected to the air-inlet
of the Monitor; the tube attached to point 2 is attached to a gas flow