ECOPROBE 5 - rs dynamics

CALIBRATION
11.3 SINGLE POINT CALIBRATION OF IR ANALYZER
For IR methane, IR total petroleum and IR CO 2 channels the same Single Point calibration procedure as for the
PID unit is valid. The IR analytical unit requires calibration over a much longer time interval as the unit has a
reference channel capable of compensating for dust, moisture, and temperature influences. The standard IR
calibration interval is about 12 months depending on the dust conditions. The calibration gases for IR channels
are not supplied by the manufacturer and it can be purchased directly from companies providing laboratory and
technical gases like Linde, Siad and others.
Both IR Methane and IR Total Petroleum channels are calibrated with methane. For their Single Point
calibration use a gas comprising 10 000 ppm methane mixed with nitrogen.
For calibrating the CO 2 channel use a gas comprising 10 000 ppm CO 2 mixed with nitrogen.
Reserve one calibration bag for calibrating the IR Methane and IR Total Petroleum channels and a second bag
for calibrating the CO 2 channel. Do not interchange them as they may contain residues of calibration gases
and thus cause inaccurate results.
For calibrating all IR channels simultaneously, it is possible to use a mixture of 10 000 ppm of methane
and 10 000 ppm of CO2 (mixture with nitrogen). In this case only one calibration bag is needed for this
mixture of calibration gases.
The calibration bags are not cheap and they should be kept in good order. Do not crease them -- they may lose
their gas-holding capacity.
11.4 Single Point Calibration Procedure of IR channels
The procedure is similar to calibrating the PID analyzer. At
the calibration locality measure the calibration standard -- in
our case a mixture of 10 000 ppm methane and 10 000 ppm
CO2). Then go to CALIBRATION in the Main Menu.
Continue the calibration procedure as described above. Find
the point with measured standard, and in the window W.29
activate the IR channels and type in the actual values of
calibration standard.
Go to Calibrate! and complete the calibration according the
described procedure for the PID analyzer.
The calibration constant for methane may vary from 0.3 to 5;
for total petroleum channel from 0.1 to 30, and for CO2
channel from 0.5 to 2.
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== Select channel ==
PID-S: No ppm
Measured = ---.-- ppm
IR –MET: Yes 10 000 ppm
Measured = 9 783 ppm
IR – TP: Yes 10 000 ppm
Measured = 9 953 ppm
IR – CO2: Yes 10 000 ppm
Measured = 9 876 ppm
O2: No %
Measured = 18.78 %
Press.: No mb
Measured = 959.56 mb
Temp.: No C
Measured = ---.-- C
Calibrate!
W.29 - Selection of IR channels for calibrating the
IR analyzer.
For calibrating CO2 go directly to the CALIBRATION item in the Main Menu without measuring a calibration
locality; select ZERO CO2 in the Calibration Menu and follow the instructions on the screen. This
procedure is an exception for zero CO2.