Specifications

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Siemens FI 01 · 2015 US Edition

Temperature Measurement

Transmitter for field mounting/field indicator

SITRANS TF - Transmitter, two-wire system and SITRANS TF - Field indicator for 4 to 20 mA

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Overview

Our field devices for heavy industrial use

•HART, Universal

• 4 to 20 mA, universal

• Field indicator for 4 to 20 mA signals

The temperature transmitter SITRANS TF works where others

feel uncomfortable.

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Benefits

• Universal use

- as transmitter for resistance thermometer, thermocouple ele-

ment,  or mV signal

- as field indicator for any 4 to 20 mA signals

• Local sensing of measured values over digital display

• Rugged two-chamber enclosure in die-cast aluminium or

stainless steel

• Degree of protection IP67

• Test terminals for direct read-out of the output signal without

breaking the current loop

• Can be mounted elsewhere if the measuring point

- is hard to access,

- is subject to high temperatures,

- is subject to vibrations from the system,

- or if you want to avoid long neck tubes and/or protective

tubes.

• Can be mounted directly on American-design sensors

• Wide range of approvals for use in potentially explosive atmo-

spheres. "Intrinsically safe, non-sparking and flameproof" type

of protections, for Europe and USA.

• SIL2 (with Order Code C20), SIL2/3 (with C23)

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Application

SITRANS TF can be used everywhere where temperatures need

to be measured under particularly adverse conditions, or where

a convenient local display is ideal. Which is why 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 ele-

ments. The inner workings offer high measuring accuracy, uni-

versal input and a wide range of diagnostic options.

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Function

Configuration

The communication capability over the HART protocol V 5.9 of

the SITRANS TF with an integrated SITRANS TH300 permits pa-

rameterization using a PC or HART communicator (hand-held

communicator). The SIMATIC PDM makes it easy.

Parameterization is carried out using a PC for SITRANS TF with

the integrated and programmable SITRANS TK. Available for

this purpose are a special modem and the software tool

SIPROM T.

Mode of operation

Mode of operation of SITRANS TF as temperature transmitter

The sensor signal, whether resistance thermometer, thermocou-

ple element or  or mV signal, is amplified and linearized. Sen-

sor and output side are electrically isolated. An internal cold

junction is integrated for measurements with thermocouple ele-

ments.

The device outputs a temperature-linear direct current of 4 to

20 mA. As well as the analog transmission of measured values

from 4 to 20 mA, the HART version also supports digital commu-

nication for online diagnostics, measured value transmission

and configuration.

SITRANS TF automatically detects when a sensor should be in-

terrupted or is indicating a short-circuit. The practical test termi-

nals allow direct measurement of 4 to 20 mA signals over an am-

meter without interrupting the output current loop.

Mode of operation of SITRANS TF as field indicator

Any 4 to 20 mA signal can be applied to the generous terminal

block. As well as a range of predefined measurement units, the

adjustable indicator also supports the input of customized units.

This means that any 4 to 20 mA signal can be represented as

any type of unit, e.g. pressure, flow rate, filling level or tempera-

ture.

Mode of operation: SITRANS TF with integrated transmitter and digital

display

1 Analog-to-digital converter

2 Electrical isolation

3 Microprocessor

4 Digital-to-analog converter

5 Power supply

6 PC/laptop

7 HART modem

8 Digital display (option)

9 Test connector

Sensor

Power supply

Load

0000

00°C

RTD

µP

SITRANS TF

SITRANS TH300