User's Manual

46 - K4 b
2
User Manual
have available a cylinder filled of a concentration known of mixed gas. It is suggested
to use CO
2
5,00% , O
2
16% concentrations and N
2
for balance.
The calibration unit
The gas regulator has an adjustable second stage that must be open every time the
cylinder is used for the calibration. This is necessary to avoid a small leakage in the
connections can discharge the bottle in few time.
1. Make sure you wait for warm-up time before starting calibrating. Be sure the high-
pressure tube supplied together with the system is connected to the "Cylinder" plug.
2. Open the cylinder valve by turning the valve counter-clockwise, the pressure value
must be set within a range of 300-500 Kpa (3-5 bars or 44-73 Psi).
After these operation, please operate as follows.
Reference gas calibration using the PC software
1. Connect the K4 b
2
unit to the PC by the serial port. Remove the sampling plug from
the optoelectronic reader.
2. Run the calibration program and choose Gas from the Calibration menu.
3. The message "Gas calibration in progress..." will appear and a graph will show in
real time the O
2
and CO
2
calibration. The software runs first the Room Air
calibration, so do not connect the sample plug to cylinder output until the message
"Sample reference gas..." will be displayed. At the end of the procedure the
message "Calibration done" will be visualized.
4. The dialogue box showing the calibration results will appear, press OK to confirm
the calibration.
Reference gas calibration using the Portable Unit
1. Remove the sampling plug from the flowmeter.
2. In the main menu choose Calibration menu, choose Refernce gas calibration and
confirm by pressing Enter.
3. The K4 b
2
runs first the Room Air calibration, so do not connect the sample plug to
cylinder output until the message " Sample reference gas..." will be displayed. At
the end of the procedure the message "Calibration done" will be visualized.
sss
Notice
: Before calibrating be
sure the "Reference values"
of room air and reference
gas are properly entered.
sss
Caution: Be sure that the
cylinder pressure out is
regulated to 3 and 5 bar.
sss
Notice: If the pressure
regulator is set at a different
pressure from what
specified, room air could be
mixed together with
reference gas and the
calibration could be affected.
sss
Notice
: Before calibrating be
sure the "Reference values"
of room air and reference
gas are properly entered.