KROHNE OPTITEMP TRA-TCA EN - Manual (Page 18)

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DEVICE DESCRIPTION
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OPTITEMP TRA/TCA
www.krohne.com 08/2010 - 4000630501 - MA OPTITEMP TRA/TCA R01 en
2.3.2 Threaded thermometer
Threaded thermometers without neck tubes are particularly suited to the mid temperature
range (up to +250°C / +482°F) in industrial applications. They are recommended for general
measuring tasks in chemical process technology and in engineering where the most common
process adaptation is screwing into pipelines and tanks.
For higher process temperatures (from +250°C / +482°F), threaded thermometers with neck
tubes are recommended. The neck tube increases the distance between the process connection
and the connection head so that the latter does not overheat. It also makes it possible to install
connection heads outside of the insulation of pipelines and tanks.
For threaded thermometers with and without neck tubes, the manufacturer offers three
different thermowell tips (straight thermowell, tapered tip, reduced tip). The tapered tip version
is, however, only available with a neck tube. G or NPT thread variants are available.
2.3.3 Flange thermometer
All of the flange thermometers available from the manufacturer feature a neck tube (to
thermally decouple the process connection and the connection head). They are used in the upper
temperature range in industrial applications (up to +600°C / +1112°F). They are particularly
suited to tanks, especially ones coated on the inside.
According to the requirements for chemical resistance, the manufacturer can coat the flange
thermometer with Teflon, PTFE or a customer-specific material as an option. Both DIN and
ASME flanges are available. The surface roughness of the flange sealing surface is 3.2...12.5 μm
(DIN EN flange) or 3.2...6.3 μm (ASME flange).
Customers can choose from three different thermowell tips (straight thermowell, tapered tip,
reduced tip) for flange thermometers too. The manufacturer offers flanges in compliance with
DIN or ASME standards.
.book Page 18 Tuesday, August 17, 2010 12:18 PM