KROHNE OPTITEMP TRA-TCA EN - Manual (Page 17)

DEVICE DESCRIPTION
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OPTITEMP TRA/TCA
www.krohne.com 08/2010 - 4000630501 - MA OPTITEMP TRA/TCA R01 en
The tip of the thermowell comes in three different shapes, however the tapered tip is not
available on the threaded thermometer without neck tube (to see what the thermowell tips look
like, refer to the control drawing in the "Technical Data" section):
• Straight thermowell tip (standard), available in 9 mm / 0.35", 11 mm / 0.43" and 12 mm /
0.47" diameters.
• Reduced thermowell tip to reduce response time, available in 11 mm / 0.43" and 12 mm /
0.47" diameters.
• Tapered thermowell tip to reduce response time (similar to Form 3 as per DIN 43772,
previous NAMUR variant), available in 12 mm / 0.47" diameter.
Thermowells with reduced tips require a measuring insert with a diameter of 3 mm / 0.12". Both
of the versions with a straight thermowell and tapered tip require a measuring insert with a
diameter of 6 mm / 0.24".
2.3 Process connections and areas of application
2.3.1 Insertion type thermometer (with and without thermowell)
Insertion-type thermometers are suitable for applications that do not have high pressure or high
flow velocities. Their use is particularly recommended in variable configurations or for the
measurement of air and flue gas temperatures.
In the version without a thermowell, the measuring insert immersion tube is in direct contact
with the medium being measured. This allows the thermometer to react more quickly to
changes in temperature. This feature is especially important when measuring gas temperatures
and temperatures of very slow flowing media.
For reasons of stability, the manufacturer offers only one measuring insert with an immersion
tube diameter of 6 mm / 0.24" for the insertion-type thermometer without thermowell.
INFORMATION!
The manufacturer checks all of the thermowells for leaks. An optional certified pressure test is
available for a fee.
INFORMATION!
Both the reduced and the tapered tip feature a shorter response time than a straight
thermowell. However, compared to the reduced tip, the tapered tip withstands higher pressures
and offers maximum resistance to vibration.
.book Page 17 Tuesday, August 17, 2010 12:18 PM