Specifications

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Siemens FI 01 · 2015 US Edition

Temperature Measurement

Transmitters for mounting in sensor head

SITRANS TH300 two-wire system, universal, HART

■

Overview

"HART" to beat - the universal SITRANS TH300 transmitter

• Two-wire devices for 4 to 20 mA, HART

• Mounting in the connection head of the temperature sensor

• Universal input for virtually any type of temperature sensor

• Configurable over HART

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Benefits

• Compact design

• Flexible mounting and center hole allow you to select your pre-

ferred type of installation

• Electrically isolated

• Test sockets for multimeters

• Diagnostics LED (green/red)

• Sensor monitoring

open circuits and short-circuits

• Self-monitoring

• Configuration status stored in EEPROM

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

• Expanded diagnostic functions, such as slave pointer, operat-

ing hours counter, etc.

• Special characteristic

• Electromagnetic compatibility to EN 61326 and NE21

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Application

SITRANS TH300 transmitters can be used in all industrial sec-

tors. Due to their compact size they can be installed in the con-

nection head type B (DIN 43729) or larger. The following sen-

sors/signal sources can be connected over their universal input

module:

• Resistance thermometers (2, 3 or 4-wire system)

• Thermocouples

• Resistance-based sensors and DC voltage sources

The output signal is a direct current from 4 to 20 mA in accor-

dance with the sensor characteristic, superimposed by the dig-

ital HART signal.

Transmitters of the "intrinsically safe" type of protection can be in-

stalled within potentially explosive atmospheres. The devices

comply with the Directive 94/9/EC (ATEX), as well as FM and

CSA regulations.

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Function

The SITRANS TH300 is configured over HART. This can be done

using a handheld communicator or even more conveniently with

a HART modem and the SIMATIC PDM parameterization soft-

ware. The configuration data are then permanently stored in the

non-volatile memory (EEPROM).

Once the sensors and power supply have been correctly con-

nected, the transmitter outputs a temperature-linear output sig-

nal and the diagnostics LED displays a green light. In the case

of a sensor short-circuit, the LED flashes red, an internal device

fault is indicated by a steady red light.

The test socket can be used to connect an ammeter at any time

for monitoring purposes and plausibility checks. The output cur-

rent can be read without any interruption, or even without open-

ing the current loop.

SITRANS TH 300 function diagram

Input

A/D Analog-digital converter

Sensors Resistance thermometer, thermocouple,

resistance-based sensor, mV sensor

μC1 Microcontroller, secondary circuit

Output

μC2 Microcontroller, primary circuit

D/A Digital-analog converter

aux

Auxiliary power supply

out

Output current

(1) Electrically isolated

(2) LED

TC/RTD

sensor

(2)

-2

(1)

µC1

µC2

Test

4 ... 20 mA U

aux

, I

out

SITRANS TH200/TH300