Dansensor A/S
COPYRIGHT ©
PBI-320297-B 02/2014
CheckPoint O
2
EN
User Guide
13
O
2
sensor temperature sensitivity
Due to the sensor design the readout will be
affected when moving the device from cold to
warm temperatures or vice versa.
Normally for compensation to work properly the
device must be stabilized at the current ambient
temperature for some time (up to 1-2 hours).
However if you cannot wait for this time, use
short stabilizing time, for example 10-15 min.,
and perform an offset (20.9%) calibration of the
O
2
sensor right before each measurement series
until device has stabilized.
This will bring the calibration back in line with
current response.
Calibration
CheckPoint O
2
only has to be calibrated with
atmospheric air. If CheckPoint does not show
approx. 20.9 % O
2
(between 21.3 % and 20.5 %)
when measuring atmospheric air, it must be
calibrated with atmospheric air. Make sure that
only atmospheric air is sucked during calibration.
Start calibration
(2) +
(3) :
Press the
key and hold it down. Press
and
release both keys. During calibration the display
alternately shows “CAL.” and “20.9” for 45
seconds. CheckPoint has now been calibrated.
Stop calibration
Press
to interrupt the calibration process.
External power supply/charger (14)
CheckPoint can be connected to an external
power supply/charger. When the power supply is
connected/disconnected, the display shows
"P.On" and "P.OF.", respectively. If CheckPoint is
fitted with ordinary batteries, they will be
disconnected. If CheckPoint is fitted with
rechargeable batteries, they will be recharged
automatically.
WARNING! Only connect the original
power supply.
CheckPoint messages
"P.On "
Power on. External power supply
connected.
"P.OF. "
Power off. External power supply
disconnected.
"Lo./BAt."
Low battery voltage. Replace the
batteries, or connect the external
power supply/charger.
WARNING! When rechargeable
batteries are installed in the
CheckPoint, ordinary batteries must
NOT be installed.
CheckPoint error messages
"P.Er.
"Power error. Error in the external
power supply. Power supply with
incorrect output voltage connected.
Remove the power supply
immediately.
CheckPoint cannot be switched off
before the incorrect power supply
has been removed.
"Er.x "
Internal error. CheckPoint must be
forwarded for service.
