User's Manual

Chapter 4 - Calibration - 45
Set the reference values using the Portable Unit
To set reference values from the K4 b
2
Portable Unit go to the main menu, choose
Calibration and scroll tasks up to choose Set Cal. Predicted Values, type the values
using the arrow keys and press Enter to confirm changes.
Room air calibration
Room Air calibration is forced to be performed before each test. With this procedure the
system calibrates both gas analyzers according to the Room Air Concentrations
(20.95% O
2
and 0.03% for CO
2
). You can run this procedure either with the software or
directly with the Portable Unit.
Room air calibration using the PC software
1. Connect the Portable Unit to the PC by the serial port. Remove the sampling plug
from the flowmeter.
2. Run the calibration program and choose Room air from the Calibration menu.
3. The message "Room air calibration in progress..." will appear and a graph will
show in real time the O
2
and CO
2
calibration. At the end of the manoeuvre the
message "Calibration done" will be visualized.
4. The following dialogue box will appear showing the calibration results, press OK
to confirm the calibration.
Room air calibration using the Portable Unit
1. Remove the sampling plug from the flowmeter.
2. In the main menu choose Calibration menu, choose Room Air Calibration and
confirm by pressing Enter.
3. The procedure is automatically performed until the message "Calibration done"
appears, the O
2
and CO
2
values will be visualized on the display.
Reference gas calibration
The software allows to automatically calibrate zero, gain and alignments of the gases
sensors. Even if the program doesn't force you to carry out the calibration, the system
should be calibrated before each test. To perform the sensor calibration is necessary to
sss
Note: After turning on the
unit, wait 45 minutes warm
up time before starting the
calibration procedure.
sss
Important: During
calibration always remove
the sampling tube from the
optoelectronic reader. Do
not remove the sampling
tube from the Portable Unit
otherwise calibration could
be affected.
sss
Caution: During Room Air
calibration be sure to put the
sampling line far from the
expired gas otherwise
calibration could be affected.
sss
Caution: Room Air calibration
performed in small ambients
(high concentration of CO
2
)
affects the calibration results
and the accuracy of the
following test.
sss
Notice: Do not use mixtures
with a O
2
concentration above
24% since it is out of the
oxygen sensor range