Technical data, 8 sensor response times – KROHNE OPTITEMP TRA-TCA Plus EN User Manual
Page 73
TECHNICAL DATA
7
73
OPTITEMP TRA/TCA PLUS
www.krohne.com
01/2012 - 4000630301 - MA OPTITEMP TRA/TCA Plus R01
7.8 Sensor response times
Thermometer response times are generally indicated as "50% time" (t
05
) and "90% time" (t
09
).
"50% time" refers to the time needed for a thermometer signal to achieve 50% of its end value in
the face of erratic temperature changes (this applies analogously to "90% time").
Thermometer with welded, straight thermowell
Thermometer without thermowell (TRA/TCA-S34 and -S50 with Ø 6 mm / 0.24")
INFORMATION!
You can find more information about response times in VDI 3522.
Ø of thermowell
Pt100 RTD
Thermocouple
[mm]
["]
t
05
[s]
t
09
[s]
t
05
[s]
t
09
[s]
9
0.35
17
52
14
42
11
0.43
21
58
17
46
12
0.47
22
66
18
54
Water flows against the thermometer at 0.4 m/s or 1.31 ft/s
Sensor
Water with 0.4 m/s or 1.31 ft/s
Air with 1 m/s or 3.28 ft/s
t
05
[s]
t
09
[s]
t
05
[s]
t
09
[s]
Pt100 RTD
3.5
8
24
54
Thermocouple
2.5
7
21
50
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