PBI-300042-B 10/2010 COPYRIGHT © PBI-Dansensor A/S
18 User Guide EN CheckMate 3
Measuring
Getting the best measurement performance
There are a number of factors to take into consideration when measuring O
2
and CO
2
gasses.
The following guidelines should help you to obtain the best possible measurement accuracy
and performance from the CheckMate 3 device.
The device uses either a Zirconia (Zr) based O
2
sensor or an electrochemical (EC) O
2
sensor.
The electrochemical (EC) sensor has some limitations compared to the Zirconia based
sensor with regards to response time and cross sensitivity for CO
2
gasses. Due to this fact
the CheckMate 3 provides advanced Speed-Up functions in software allowing measurement
times down to 7 secs. For devices with built-in CO
2
sensors we also incorporate a scheme for
reducing the effects of cross sensitivity to CO
2
.
The CO
2
sensor (if installed) is of the Non Dispersive Infrared (NDIR) type.
Both sensors are temperature- and pressure compensated in software. However
temperature compensation requires stabilizing internally for some time.
In spite of the above efforts there are still limitations to what can be physically achieved.
To get the most out of your device, we strongly recommend that you read these next pages to
familiarize yourself with the various conditions, which may have impact on the
measurements.
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