KROHNE OPTITEMP TRA-TCA Plus EN - Manual (Page 15)

DEVICE DESCRIPTION
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OPTITEMP TRA/TCA PLUS
www.krohne.com 01/2012 - 4000630301 - MA OPTITEMP TRA/TCA Plus R01
One distinguishing dimension of the measuring insert is its length. The length is measured from
the bottom edge of the base to the tip of the immersion tube ("a" in the drawing below):
The selection of the right measuring insert depends on the conditions of use:
• A measuring insert with a thermocouple is better suited to heavy thermal or mechanical
loads.
• When increased accuracy is required, a measuring insert with a resistance thermometer is
better suited for temperatures up to +500°C / +932°F and in exceptional cases up to +600°C /
+1112°F.
2.2.4 Types of temperature transmitters
Electrical thermometers have just one, weak, interference-prone output signal. If this signal has
to travel a great distance or if a standard signal of 4...20 mA is required, use of a temperature
transmitter is recommended:
There are two types of temperature transmitters:
• Head-mounted transmitter: Located on the measuring insert and thus in the connection head
of the thermometer during operation, recognisable by the "C" in the product name
(e. g. TT 10 C)
• Rail-mounted transmitter: Located in the control cabinet or field housing, recognisable by
the "R" in the product name (e. g. TT 11 R); they are usually used when the temperature in the
connection head does not allow for the use of a head-mounted transmitter
Figure 2-3: Measuring insert length
INFORMATION!
Consult the handbook "OPTITEMP TR/TC 100" for more detailed information on the measuring
inserts.
INFORMATION!
The manufacturer cannot make any general statement as to the distance from which the use of a
temperature transmitter is necessary as it depends on the specific interference associated with
the installation site. The operator alone is responsible for this decision.
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