SIEMENS SITRANS TF Temperature Transmitters

SIEMENS SITRANS TF Temperature Transmitters Process Instrumentation

SITRANS TF is used where other transmitters can’t cope. One main point is its rating of IP67.

SITRANS TF is made of rugged die cast aluminum or long-lasting stainless steel. It transforms resistance thermometers, thermocouples, Ohm and mV signals into a load independent DC current corresponding to sensor characteristic or a digital signal according Fieldbus standard Profibus PA or Foundation Fieldbus. The remote mounted sensor prevents the transmitter heating up at high temperature; there are no vibrations and oscillations due to long neck tubes and protective pipes with SITRANS TF.

For tags with difficult access to you can mount your SITRANS TF remotely at easily accessible places and display the measured value on the freely programmable digital display (with version 4 to 20 mA).

You can even use the SITRANS TF in a version without a transmitter as a comfortable field display unit for all 4 to 20 mA signals.
All SITRANS TF are available in intrinsically safe or explosion proof version

Overview

SITRANS TF field housings can be equipped with a display module which only displays the 4 to 20 mA signals from the transmitter. The keys ③ are used exclusively for adapting the current display to the transmitter parameters, for example, to modify the display units (°C).
Use of the display module has no influence on the transmitter functions. An overview of the display functions can be found in Chapter “Optional modes (Page 47)”.

Application range

The SITRANS TF temperature transmitter converts sensor signals into a load-independent DC signal according to the sensor characteristic. The following sensors and signal sources can be connected to the input block:
● Resistance thermometer
● Thermocouples
● Resistance-type transmitter/potentiometer
● DC voltage sources
The output signal is a current of 4 to 20 mA corresponding to the sensor characteristic. Explosion-proof transmitters can be installed and operated within potentially explosive atmospheres in compliance with the information given on the relevant certificates and approvals and in these Operating Instructions.

Product features

● Transmitter for universal use for:
– Resistance thermometer
– Thermocouples
– Ω signals
– mV signals
● IP67 degree of protection
● Optional display module for local measured values can be shown using optional display module.
● Two versions:
– Aluminum die-casting
– Stainless steel
● Remote installation option:
– For difficult to access measuring points
– For high-temperature measuring points
– In case of vibrations in the process cell
– To avoid long neck or protective rings
● Comprehensive approvals for operation in potentially explosive atmospheres. Types of protection “intrinsically safe, non incendive, and flameproof”, for Europe and the USA.
● SIL 2 (optional, with order suffix C20)

Benefits

SITRANS TF, fieldbus transmitter

Application

The SITRANS TF can be used everywhere where temperatures need to be measured under particularly harsh conditions. For that reasons users from all industries have opted for this field device. The rugged enclosure protects the electronics. The stainless steel model is almost completely resistant to sea water and other aggressive elements. The inner workings offer high measuring accuracy, universal input and a wide range of diagnostic options.

Mode of operation

The following function diagram explains the mode of operation of the transmitter.

The only difference between the two versions of the SITRANS TF (7NG3137-… and 7NG3138-…) is the type of field bus protocol used (PROFIBUS PA or FOUNDATION fieldbus).

SITRANS TF with TH400, function diagram

System communication

SITRANS TF with TH400, communication interface

Dimensional drawings

SITRANS TF with TH400, dimensions in mm (inches)

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