NOMACORC NomaSense CO2 P2000, User Manual

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9
The device should be calibrated if it indicates
a value that deviates by more than 2-3% when
measuring gas with a known CO
2
content.
Calibration preconditions
• The device must be calibrated using a 0%
CO
2
gas and a 100% CO
2
gas.
• Always start with the 0% calibration.
• For the 0% calibration you can use
100% N2 or air with a known content.
When using atmospheric air as 0% CO
2
calibration gas, you must ensure that
there are no increased or unstable CO
2
concentrations in the air, as this may result
in erroneous measurements at relatively
high CO
2
concentrations.
• Carry out any such calibrations far
away from the CO
2
application area
and ventilate the device thoroughly
using atmospheric air by performing
5 measurements with “clean” atmospheric
air before carrying out the actual
calibration.
• The calibration gas must not be forced
through the device. Let the needle suck
the gas from a 0.2 - 1.0 l/min overflow.
• Before calibration, the device must be
switched into “TEST MODE” to display the
actual measured CO
2
%:
- Press the (ON/OFF) key to switch the
device off.
- Press and hold the (ON/OFF) +
(TEMP./MEMORY) keys simultaneously
for 3 secs.
- The device will beep and show “0.00”
in the top of the display (2) and “t”
(for test) in the small display (4).
- When measuring CO
2
the bottom
of the display (1) shows “CO
2
”. If
measured value is negative, the
display will show “CO
2
.” (CO
2
followed
by a decimal point).
- The device will be in “TEST MODE” until
it is switched OFF.
Performing 0% calibration
• Prepare the device with a proper 0% CO
2
calibration gas.
• Press and hold the (MEASURE) key. Now
press (TEMP./MEMORY) key, then release
both keys.
• Throughout the calibration process the
device automatically determines whether
a 0% or a 100% calibration gas is being
supplied. In this case the device should
switch between “CAL.” and “0.0”.
• If not, it is important to interrupt the
calibration process (press (ON/OFF)
key) or to manually select the correct
calibration gas by pressing the (MEASURE)
+ (TEMP./MEMORY) keys again.
• Calibration takes app. 45 sec.
Performing 100% calibration
• Prepare the device with a proper 100%
CO
2
calibration gas.
• Press and hold the (MEASURE) key. Now
press (TEMP./MEMORY) key, then release
both keys.
• Throughout the calibration process the
device automatically determines whether
a 0% or a 100% calibration gas is being
supplied. In this case the device should
switch between “CAL.” and “100”.
• If not, it is important to interrupt the
calibration process (press (ON/OFF)
key) or to manually select the correct
calibration gas by pressing the (MEASURE)
+ (TEMP./MEMORY) keys again.
• Calibration takes app. 45 sec.
Stop calibration
Press (ON/OFF) to interrupt a calibration
process.
Calibration