KROHNE OPTITEMP TR 100-TC 100 EN - Manual (Page 13)

INSTALLATION
3
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OPTITEMP TR/TC 100
www.krohne.com 10/2009 - 4000630002 - MA OPTITEMP TR/TC 100 R02 en
3.5 Installation without thermowell
In 90% of the cases, the TR 100 and TC 100 measuring inserts are installed in thermometer
fittings consisting of a thermowell with process connection, a connection head and, if necessary,
an extension length. An insert without thermowell and with only a connection head is also
possible, e.g. with type TRA-P35 thermometers or
TCA-P35 (see manual entitled "Industrial thermometers with replaceable measuring inserts").
In this case, the measuring insert sheath is immersed directly into the product to be measured,
so that the thermometer can react more quickly to changes in temperature. This can be very
important, especially when measuring gas temperatures and extremely slow-flowing products.
A compression fitting with an inner diameter of 3 mm / 0.118" or 6 mm / 0.236" and an outer
thread of G ¼" or G ½" is suitable to use for attachment. Except for the bottom 50 mm / 1.97",
measuring inserts can be bent.
3.6 Installation with thermowell
To guarantee optimal temperature transfer, two springs press the measuring insert to the
bottom of the thermowell. The displacement is approx. 5 mm / 0.197", so that measuring inserts
with minimally varying lengths can be used.
CAUTION!
The smallest bending radius must be at least three times the diameter of the sheath. Otherwise
it may result in damage to the mineral insulated jacket cable.
CAUTION!
The sheath may not be bent in the bottom 50 mm / 1.97" as the RDT may otherwise break.
INFORMATION!
For measuring inserts with a sheath diameter of 3 mm / 0.118", only thermowells with a certain
shape are suitable (as a rule this means thermowells with reduced tips). Otherwise the
thermometer reacts more slowly and it measures incorrect. The thermometer reads too low
when above room temperature and too high when below.
INFORMATION!
The sheath length of the measuring insert must be measured so the tip of the sheath touches the
bottom of the thermowell of the thermometer fitting. In addition, the diameter of the sheath
should be big enough that the side air gap between the sheath and the thermowell is as small as
possible. This ensures the heat transfer from the bottom and wall of the thermowell to the
sheath and reduces the response time of the thermometer.
.book Page 13 Thursday, October 8, 2009 10:26 AM