Ametek mocon Dansensor CheckMate3 - Explanation of the Response Time (T 95 )

Dansensor® CheckMate 3 EN User Guide 19
P/N 300042-I
05/2019
Explanation of the “Response time (T
95
)”
NOTE! Only valid for devices with an electrochemical (EC) O
2
sensor.
According to the specifications the Electro-chemical (EC) O
2
sensor has a
Response time (T
95
) of 9 sec.
This means that when performing consecutive measurements in areas with large differences
in the O
2
concentrations, the device will as a minimum reach 95% of the “true” value during
the first measurement (9 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 a
more accurate result.
O reading
2
[%]
time [sec]
T=0
Start value
Difference = Start "True" valuevalue
T value = Start value (0.95*Difference)
95
T value
95
"True" value
T=9
(1. measurement) (2. measurement)
T=18
Difference