SIEMENS SITRANS TH420 Temperature Transmitter

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Siemens SITRANS TH420 transmitter, featuring dual inputs, offers versatile usage across all industries. Its compact design allows for installation in connection heads of type B or larger. With its universal input module, redundant operation (high input availability) is supported, enabling connection of the following sensors and signal sources:

  • 2 resistance thermometers (2-wire, 3-wire, 4-wire connection)
  • 2 thermocouples
  • 2 linear resistors, potentiometers, and DC voltage sources
Part Number: SIE_TH420_2462
SIEMENS SITRANS TH420 Temperature Transmitter

Benefits

The output signal comprises a load-independent direct current from 4 to 20 mA, aligned with the input characteristic, and augmented by the digital HART signal.

The dual input mode facilitates drift detection of inputs, enabling more efficient maintenance planning.

Transmitters designed for “intrinsically safe or Zone 2 increased safety” protection can be safely deployed in hazardous areas. Compliant with EU Directive 2014/34/EU (ATEX), FM, CSA regulations, and other national standards, these devices ensure reliability and safety in diverse environments.

  • 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 mounting type
  • 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 EN 61326 and NE21
Application Temperature Transmitter
Input (Measuring Range) Resistance thermometers, thermocouples, resistance-type sensors, DC sources
Output 4 ... 20mA (SITRANS TH320), HART (SITRANS TH320/420)
Measuring Accuracy Dependent on configuration
Operating conditions Standard: -50 … +85 °C (-58 … +185 °F) SIL: -40 … +80 °C (-40 … 176 °F)
Degree of Protection Enclosure IP40 Terminals IP00
Weight 50 g (0.11 lb)
Electrical Connections Wired direct
Explosion Protection IECEx
General Approvals SIL2/3

Siemens Process Control & Instrumentation – Procint Australia

Procint is proud to be a leading Australian supplier of Siemens process control and instrumentation products.
Siemens is recognised worldwide for precision, innovation, and long-term reliability — trusted across industries from water treatment and manufacturing to mining and energy.
At Procint, we stock and support the full range of Siemens sensors, transmitters, and measurement systems designed to keep your process accurate, efficient, and compliant.

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From differential and gauge pressure sensors to hygienic models for food and pharma, Siemens pressure instruments ensure reliable operation across even the toughest process conditions.

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Whether you need RTDs, thermocouples, or complete temperature measurement systems, Procint can help you select the right Siemens solution for your plant or project.

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Trusted across industries for consistency and durability, Siemens weighing technology helps optimise production and reduce waste.

Why Choose Siemens from Procint
When you choose Procint, you’re partnering with an Australian team that understands Siemens technology inside and out.
We offer expert advice, competitive pricing, and support for integration across all major process control systems.
From individual sensors to complete measurement networks, Procint makes it easy to source genuine Siemens process instrumentation in Australia.

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SIEMENS SITRANS TH420 Temperature Transmitter
SIEMENS SITRANS TH420 Temperature Transmitter

POA – Please submit a RFQ

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