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SITRANS TH420 Temperature Transmitter

Brand: Siemens AG
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The SITRANS TH420 transmitter with two inputs can be used in all sectors. Its compact size means that it can be installed in connection heads of type B or larger.

The output signal is a load-independent direct current from 4 to 20 mA in accordance with the input characteristic, superimposed by the digital HART signal.

The dual input mode also supports drift detection of the inputs, whereby maintenance intervals can be more easily planned.

Transmitters of the "intrinsically safe or Zone 2 increased safety" type of protection can be installed in hazardous areas.

The device meets the requirements of the EU Directive 2014/34/EU (ATEX), the FM and CSA regulations as well as other national approvals.
Features
  • Compact design
  • Connection of two independent input circuits for redundant operation (high input availability)
  • Flexible mounting and center hole allow you to select your preferred type of installation
  • Galvanic isolation
  • Test terminals for ammeter
  • Diagnostics LED (green/red)
  • Input monitoring wire break, short circuit and drift
  • Self-monitoring
  • Configuration status stored in EEPROM
  • SIL2/3 (with order note C20)
  • Expanded diagnostic functions, such as slave pointer, operating hours counter, etc.
  • Special characteristic
  • Electromagnetic compatibility according to DIN EN 61326 and NE21
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The SITRANS TH420 transmitter with two inputs can be used in all sectors. Its compact size means that it can be installed in connection heads of type B or larger.

The output signal is a load-independent direct current from 4 to 20 mA in accordance with the input characteristic, superimposed by the digital HART signal.

The dual input mode also supports drift detection of the inputs, whereby maintenance intervals can be more easily planned.

Transmitters of the "intrinsically safe or Zone 2 increased safety" type of protection can be installed in hazardous areas.

The device meets the requirements of the EU Directive 2014/34/EU (ATEX), the FM and CSA regulations as well as other national approvals.
Features
  • Compact design
  • Connection of two independent input circuits for redundant operation (high input availability)
  • Flexible mounting and center hole allow you to select your preferred type of installation
  • Galvanic isolation
  • Test terminals for ammeter
  • Diagnostics LED (green/red)
  • Input monitoring wire break, short circuit and drift
  • Self-monitoring
  • Configuration status stored in EEPROM
  • SIL2/3 (with order note C20)
  • Expanded diagnostic functions, such as slave pointer, operating hours counter, etc.
  • Special characteristic
  • Electromagnetic compatibility according to DIN EN 61326 and NE21
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Specifications

Brand

Supply Voltage

  • Without explosion protection (nonEx): 7.5 to 48 Vdc
  • With explosion protection (Ex i): 7.5 to 30 Vdc

Maximum Power Loss

  • ≤ 850 mW

Warming-Up Time

  • < 5 min

Programing

  • HART

Response Time

  • ≤ 75 milliseconds

Type of Connections

  • 2-Wire, 3-Wire or 4-Wire

Input Type RTD

  • Pt10 ... 10000
  • Ni10 ... 10000
  • Cu5 ... 1000

Input Type Thermocouples

  • Type B, E, J, K, L, Lr, N, R, S, T, U, W3, W5, LR

Output Range

  • Normal: 3.8 to 20.5 mA/20.5 to 3.8 mA
  • Extended: 3.5 to 23 mA/23 to 3.5 mA

Ambient Temperature Range

  • -50° C to 85° C
  • -58° F to 185° F

HART Protocol Versions

  • HART 7

Certificates & Approvals

  • DEKRA 17ATEX0116 X
  • IECEx dEK 17.0054X
  • A5E43700604A-2018X
  • ATEX: II 1 G Ex ia IIC T6 ... T4 Ga, II 2(1) G Ex ib [ia Ga] IIC T6 ... T4 Gb, II 1 D Ex ia IIIC Da, I M1 Ex ia I Ma
  • IECEx: Ex ia IIC T6 ... T4 Ga, Ex ib [ia Ga] IIC T6 ... T4 Gb, Ex ia IIIC Da, Ex ia I Ma
  • CSA 1861385
  • FM18CA0024
  • FM18US0046

Degrees of Protection

  • Transmitter Enclosure: IP68
  • Terminals: IP00
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