12 User Guide EN CheckPoint O
2
PBI-320297-B 02/2014 COPYRIGHT © Dansensor A/S
O reading
2
[%]
time [sec]
T=0
Start value
T value
95
"True" value
T=15
(1. measurement) (2. measurement)
T=30
Difference
Difference = Start "True" valuevalue
T value = Start value (0.95*Difference)
95
What does “Response time (T
95
)” mean
According to the specifications on page 3 the O
2
sensor has a Response time (T
95
) of 15 sec.
This means that when performing consecutive
measurements in areas with large differences in
the O
2
concentrations, the device will reach 95 %
of the “true” value during the first measurement
(15 sec.).
Example:
(See illustration below):
• Last measurement was performed in i.e.
20.9 % O
2
• The following value to be measured is
1.0 % O
2
• Difference is:
20.9 - 1.0 = 19.9 % O
2
• The expected read-out value after first
measuring is:
20.9 - (0.95 * 19.9) = 2.0 % O
2
Consequently this means that if there is a large
difference in the O
2
concentrations between two
consecutive measurements, multiple
measurements must be performed to obtain the
most accurate result.
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