Specifications

ManualsBrandsSiemens ManualsCell PhoneC11

2/22

Siemens FI 01 · 2015 US Edition

Temperature Measurement

Transmitters for mounting in sensor head

SITRANS TH400 fieldbus transmitter

■

Overview

SITRANS TH400 fieldbus transmitters

Versions:

• For FOUNDATION fieldbus

• For PROFIBUS PA

The SITRANS TH400 temperature transmitter is a small field bus

transmitter for mounting in the connection head of form B. Exten-

sive functionality enables the temperature transmitter to be pre-

cisely adapted to the plant’s requirements. Operation is very

simple in spite of the numerous setting options. Thanks to its uni-

versal concept it can be used in all industries and is easy to in-

tegrate in the context of Totally Integrated Automation applica-

tions.

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.

Installing SITRANS TH400 in temperature sensors turns them

into complete, bus-capable measuring points; compact - and in

a single device.

■

Application

• Linearized temperature measurement with resistance ther-

mometers or thermal elements

• Differential, mean-value or redundant temperature measure-

ment with resistance thermometers or thermal elements

• Linear resistance and bipolar millivolt measurements

• Differential, mean-value or redundant resistance and bipolar

millivolt measurements

■

Function

Features

• Mounting in connection head, type B, to DIN 43729, or larger

• Polarity-neutral bus connection

• 24-bit analog-digital converter for high resolution

• Electrically isolated

• Intrinsically-safe version for use in potentially explosive areas

• Special characteristic

• Sensor redundance

With PROFIBUS PA communication

• Function blocks: 2 x analog

With FOUNDATION fieldbus communication

• Function blocks: 2 x analog and 1 x PID

• Functionality: Basic or LAS

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

TH400 (7NG3214-... and 7NG3215-...) is the type of fieldbus

protocol used (PROFIBUS PA or FOUNDATION fieldbus).

SITRANS TH400, function diagram

Optional inputs:

- Resistance thermometer

- Thermocouple

- mV sensor

- Resistance-based sensors

Input 1

Input 2

Transformer

Input 1

Input 2

Differential

Mean value

Redundancy

Terminal temperature

Engineering units

Diagnostic functions

Table linearization

Polynomial linearization

Process calibration

A/D

converter

Complex configuration

Correction coefficient

Factory settings

- PROFIBUS protocol (7NG3214)

- Foundation Fieldbus protocol (7NG3215)

Bus connection

Ex power circuit

Electrically

isolated

Internal

Pt100

Communication

EEPROM

CPU