Dansensor CheckPoint O2 Руководство пользователя - Страница 7
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12
User Guide
What does "Response time (T
According to the specifications on page 3 the O
sensor has a Response time (T
This means that when performing consecutive
measurements in areas with large differences in
the O
concentrations, the device will reach 95 %
2
of the "true" value during the first measurement
(15 sec.).
O reading
2
[%]
Start value
T value
95
"True" value
PBI-320297-B 02/2014
)" mean
95
) of 15 sec.
95
Difference
T=0
EN
Example:
(See illustration below):
2
• Last measurement was performed in i.e.
20.9 % O
• The following value to be measured is
1.0 % O
2
• Difference is:
20.9 - 1.0 = 19.9 % O
• The expected read-out value after first
measuring is:
20.9 - (0.95 * 19.9) = 2.0 % O
Difference = Start
T value = Start value
95
T=15
(1. measurement)
Consequently this means that if there is a large
difference in the O
consecutive measurements, multiple
measurements must be performed to obtain the
most accurate result.
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CheckPoint O
2
2
2
value
"True" value
(0.95*Difference)
T=30
(2. measurement)
concentrations between two
2
Dansensor A/S
2
time [sec]