Device description – KROHNE OPTITEMP Compact sensors User Manual

Page 12

DEVICE DESCRIPTION

OPTITEMP TRA-CXX

www.krohne.com

02/2014 - 4003290501 - MA OPTITEMP TRA-Cxx R01 en

2.2.3 Types of temperature transmitters

Electrical temperature assemblies 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:

• Built-in transmitter: Located in the housing of the temperature assembly
• Rail-mounted transmitter: Located in the control cabinet or field housing, recognisable by

the "R" in the product name (e. g. TT 50 R); they are usually used when the temperature in the
connection head does not allow for the use of a head-mounted transmitter

Built in transmitters

The built-in transmitters convert the temperature sensor's small signal into a standardised
output signal of 4...20 mA, not susceptible to interference. Which built in transmitter that is used
depends on the choice of the sensor.

The temperature range is set at factory:

• 0... +100°C / +32... +212°F
• -50... +150°C / -58... +302°F

Other temperature ranges are available on request.

Rail mounted transmitters

You can parameterise almost any temperature transmitter using a PC and a computer program.
The only exceptions are the TT 10 R and TT 11 R versions, whose measuring ranges must be set
using solder bridges. The following temperature transmitters are currently available:

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.

Available rail mounted transmitters

TT 10 R (analogue, 4...20 mA)

TT 11 R (analogue 3-wire transmitter, output: 0...10 VDC)

TT 30 R (digital, 4...20 mA)

TT 31 R (digital, 4...20 mA, 1- & 2-channel)

TT 32 R (digital 4-wire, outputs: 0/4...20 mA, 0/1...5 VDC, 0/2...10 VDC)

TT 40 R (digital, 4...20 mA, precise)

TT 50 R (digital, 4...20 mA, HART

)

TT 51 R (digital, 4...20 mA, HART

, SIL2, precise)

TT 60 R (digital, Profibus-PA)

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