KROHNE OPTITEMP TRA-TCA Plus EN - 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
.backup.book Page 73 Tuesday, January 10, 2012 11:57 AM