Installation – KROHNE OPTITEMP TRA-TCA EN User Manual
Page 26
3
INSTALLATION
26
OPTITEMP TRA/TCA
www.krohne.com
08/2010 - 4000630501 - MA OPTITEMP TRA/TCA R01 en
The second diagram applies to the following of the manufacturer's thermometers:
• TRA/TCA-P40, -S41, -F42
• Ø 12 x 2.5 mm / 0.47 x 0.1"
• Material 1.4571
3.5.2 Vibration load
All thermometers that feature a thermowell and neck tube and are attached to the process
connection have two components that can vibrate: the thermowell and the connection head with
the neck tube. That is why the terms "thermowell resonance" and "head resonance" are
commonly heard.
Load diagram for thermowells with tapered tip according to DIN 43772 (Forms 3, 3G
and 3F)
1 Insertion length 280 mm (11.02"), air with 40 m/s (131.2 ft/s)
2 Insertion length 280 mm (11.02"), steam with 40 m/s (131.2 ft/s)
3 Insertion length 220 mm (8.66"), air with 40 m/s (131.2 ft/s)
4 Insertion length 220 mm (8.66"), steam with 40 m/s (131.2 ft/s)
5 Insertion length 220...280 mm (8.66...11.02"), water with 3 m/s (9.8 ft/s)
6 Water
7 Vapour pressure curve
8 Steam
9 Pressure of the measured medium
10 Temperature of the measured medium
CAUTION!
Permanently operating the thermowell in its natural resonance can quickly damage or destroy
the thermometer! So, prior to installation, ensure that this does not happen and select a
thermowell with a different length, diameter or material if necessary.
.book Page 26 Tuesday, August 17, 2010 12:18 PM