SIEMENS SITRANS TH400, fieldbus transmitter

SITRANS TH400 is available either with PROFIBUS PA or FOUNDATION Fieldbus (FF). It is designed to support all common RTD, thermocouple, resistance and millivolt sensors. Setup is quick and easy with SIMATIC PDM(PA) or AMS and handheld communicator(FF). Due to its small size, the device allows flexible mounting options, even in a DIN Type B connection head.


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. Extensive functionality enables the temperature transmitter to be precisely adapted to the plant’s requirements. Operation is very simple in spite of the numerous setting options. Thanks to its universal concept it can be used in all industries and is easy to integrate in the context of Totally Integrated Automation applications.

Transmitters of the “intrinsically safe” type of protection can be installed within potentially explosive atmospheres. The devices meet the directive 2014/34/EU (ATEX) as well as the FM and CSA requirements.

Installing SITRANS TH400 in temperature sensors turns them into complete, bus-capable measuring points; compact – and in a single device.

SITRANS TH400, fieldbus transmitter Ordering data

Product No. / Product Description Listprice / Your price
7NG3214-…..
Temperature transmitter SITRANS TH400 for installation in connection head, with electric isolation, order manual separately, bus-compatible to PROFIBUS PA
7NG3214-0AN00
Temperature transmitter SITRANS TH400 for installation in connection head, with electric isolation, order manual separately, bus-compatible to PROFIBUS PA . Explosion protection: Intrinsic safety according to ATEX/FM/CSA . .
7NG3214-0NN00
Temperature transmitter SITRANS TH400 for installation in connection head, with electric isolation, order manual separately, bus-compatible to PROFIBUS PA . Explosion protection: Without Zone 2/Div 2 to ATEX/FM/CSA . .
7NG3215-…..
Temperature transmitter SITRANS TH400 for installation in connection head, Fieldbus Foundation, with electicial isolation, order manual separately
7NG3215-0AN00
Temperature transmitter SITRANS TH400 for installation in connection head, Fieldbus Foundation, with electicial isolation, order manual separately . Explosion protection: Intrinsic safety according to ATEX/FM/CSA . .
7NG3215-0NN00
Temperature transmitter SITRANS TH400 for installation in connection head, Fieldbus Foundation, with electicial isolation, order manual separately . Explosion protection: Without/ Zone 2/Div 2 to ATEX/FM/CSA . .

Application

  • Linearized temperature measurement with resistance thermometers or thermal elements
  • Differential, mean-value or redundant temperature measurement with resistance thermometers or thermal elements
  • Linear resistance and bipolar millivolt measurements
  • Differential, mean-value or redundant resistance and bipolar millivolt measurements

Dimensional drawings

SITRANS TH400 dimensions in mm (inches) and connection diagram

Mounting on DIN rail

SITRANS TH400, mounting of transmitter on DIN rail

DIN rail adaptor, dimensions in mm (inch)

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

System communication

SITRANS TH400, communication interface

Technical specifications

Input

Analog-to-digital conversion

  • Measurement rate

< 50 ms

  • Resolution

24-bit

Resistance thermometer

Pt25 … Pt1000 acc. to IEC 60751/JIS C 1604

  • Measuring range

-200 … +850 °C (-328 … +1562 °F)

Ni25 … Ni1000 acc. to DIN 43760

  • Measuring range

-60 … +250 °C (-76 … +482 °F)

Cu10 … Cu1000, α = 0.00427

  • Measuring range

-50 … +200 °C (-58 … +392 °F)

Line resistance per sensor cable

Max. 50 Ω

Sensor current

Nominal 0.2 mA

Sensor fault detection

  • Sensor break detection

Yes

  • Sensor short-circuit detection

Yes, < 15 Ω

Resistance-based sensor

Measuring range

0 Ω … 10 kΩ

Line resistance per sensor cable

Max. 50 Ω

Sensor current

Nominal 0.2 mA

Sensor fault detection

  • Sensor break detection

Yes

  • Sensor short-circuit detection

Yes, < 15 Ω

Thermocouple

According to IEC 584

Measuring range

  • Type B

400 … 1820 °C (752 … 3308 °F)

  • Type E

-100 … +1000 °C (-148 … +1832 °F)

  • Type J

-100 … +1000 °C (-148 … +1832 °F)

  • Type K

-100 … +1200 °C (-148 … +2192 °F)

  • Type N

-180 … +1300 °C (-292 … +2372 °F)

  • Type R

-50 … +1760 °C (-58 … +3200 °F)

  • Type S

-50 … +1760 °C (-58 … +3200 °F)

  • Type T

-200 … +400 °C (-328 … +752 °F)

According to DIN 43710

  • Type L

-200 … +900 °C (-328 … +1652 °F)

  • Type U

-200 … +600 °C (-328 … +1112 °F)

According to ASTM E988-90

  • Type W3

0 … 2300 °C (32 … +4172 °F)

  • Type W5

0 … 2300 °C (32 … +4172 °F)

External reference junction compensation

-40 … +135 °C (-40 … +275 °F)

Sensor fault detection

  • Sensor break detection

Yes

  • Sensor short-circuit detection

Yes, < 3 mV

  • Sensor current in the event of open-circuit monitoring

4 μA

mV sensor – voltage input

Measuring range

-800 … +800 mV

Input resistance

10 MΩ

Output

Filter time (programmable)

0 … 60 s

Update time

< 400 ms