PBI-Dansensor A/S
COPYRIGHT ©
PBI-220047-F 01/2008
23
MAP Check 9000 - User Manual
6. Calibration
3. Start the pump by means of
and connect the MAP Check 9000 measuring gas hose
to the overflow (if another gas than 20.9% is to be used for calibration) to ensure that all
gas sucked in comes from this overflow.
4. Let MAP Check 9000 measure the gas for at least four minutes. When calibrating with
gases of less than 1000 ppm it is recommended to measure for approx. 10 minutes.
Then check that the O
2
reading in the display is stable for approx. 1 minute before
calibration is carried out.
When the output is stable, it must be checked that the O
2
value reading corresponds to,
or is relatively close to, the analysis value specified for the calibration gas. If this is not
the case, the measuring gas hose and filter must be checked for leaks. It must also be
checked that a sufficient amount of gas is being supplied to the overflow from where
MAP Check 9000 extracts the calibration gas.
5. Go to the calibration menu.
- Press the
and
keys for approx. three seconds until
set.
appears.
- Press
twice and the calibration menu
CAL.
is displayed.
6. Press
and the value for the first calibration gas,
cal1.
is displayed. Calibration gas No.
1 is reserved for calibration with 20.946% (atmospheric air) and cannot be changed.
Select this setting in order to calibrate with 20.946%. If the gas to be used for calibration
is different from 20.946%, press
until an empty space appears, a space at which 0
ppm is read. Enter the gas concentration.
7. Press
and
simultaneously to start the calibration process. The display will flash
CAL.
, and after approx. 10 seconds calibration will be complete. After calibration the
result can be read. Press
and the relevant EMF value in mV is displayed. If calibration
has not been carried out with the gas in question, "- - - -" will be displayed.
8. Press
to return to ordinary O
2
output. Repeat steps 2 to 7 for each calibration gas.
9. Set
PA.1
to its original value.
NOTE! Always start the calibration with 20.9 % O
2
, even if calibration is done with
80% O
2
.
6.2. Offset adjustment
When changing the measurement setup (flow, pressure, measuring gas hose, etc.), offset
adjustment may be necessary. This adjustment is carried out in the main menu.
Supply atmospheric air to the analyser. When a stable O
2
value is displayed, offset
adjustment is started by pressing
+
simultaneously. The display will then flash
OFFS.
for approx. 5 to 10 seconds and offset adjustment is complete.
