iTherm Moduline TST434B

Summary

Product identification

The iTHERM ModuLine TST434B is a modular resistance thermometer designed for ambient temperature measurement, both indoors and outdoors. It can be supplied as a complete unit with Endress+Hauser temperature transmitters.

Application areas

• Indoor or outdoor ambient temperature measurement.
• Maximum measuring range: –50 to +150 °C (–58 to +302 °F).
• Degree of protection: IP66/68 (NEMA Type 4x encl.).

Function and system design

Measuring principle

This device utilizes resistance thermometers (RTD) employing a Pt100 temperature sensor conforming to IEC 60751. The sensor has a resistance of 100 Ω at 0 °C (32 °F) with a temperature coefficient α = 0.003851 °C⁻¹.

Two types of platinum resistance thermometers are described:

• Wire-wound (WW): Features a double coil of platinum wire within a ceramic support. Offers reproducible measurements and good long-term stability up to 600 °C (1,112 °F). Larger in size and sensitive to vibrations.
• Thin-film platinum resistance thermometers (TF): A thin platinum layer is vaporized onto a ceramic substrate. Offers smaller sizes and better vibration resistance. May exhibit deviations from the standard IEC 60751 characteristic at high temperatures, limiting tolerance class A observance to approximately 300 °C (572 °F).

The document also briefly describes Thermocouples (TC) and their principle based on the Seebeck effect, noting they primarily measure temperature differences.

Input

• Measured variable: Temperature (temperature-linear transmission behavior).
• Measuring range: Maximum –50 to +150 °C (–58 to +302 °F) according to IEC 60751, depending on configuration.

Output

The measured value can be transmitted in two ways:

• Directly-wired sensors without a transmitter.
• Via common protocols by selecting an appropriate Endress+Hauser iTEMP® temperature transmitter. These are mounted directly in the terminal head.

iTEMP® Temperature Transmitters

These offer enhanced measurement accuracy and reliability compared to directly wired sensors, reducing wiring and maintenance costs. They support various communication protocols:

• 4 to 20 mA head transmitters: 2-wire devices, configurable via PC using Endress+Hauser software.
• HART® head transmitters: 2-wire devices with one or two measuring inputs and one analog output. Can transfer resistance and voltage signals. Optional Bluetooth® interface for wireless display and configuration via E+H SmartBlue app.
• PROFIBUS® PA head transmitters: Universally programmable with PROFIBUS® PA communication. High measurement accuracy across the ambient temperature range.
• FOUNDATION Fieldbus™ head transmitters: Universally programmable with FOUNDATION Fieldbus™ communication. High measurement accuracy across the ambient temperature range. Approved for main process control systems.
• Head transmitter with PROFINET® and Ethernet-APL: 2-wire device with two measurement inputs. Powered via 2-wire Ethernet (IEEE 802.3cg 10Base-T1). Can be installed in Zone 1 hazardous areas.
• Head transmitter with IO-Link®: Features an IO-Link® interface for digital communication.

Advantages of iTEMP® transmitters:

• Double or single sensor input (optionally).
• Attachable display (optionally).
• High reliability, accuracy, and long-term stability.
• Mathematical functions.
• Monitoring of thermometer drift, sensor backup, and sensor diagnostic functions.
• Sensor-transmitter matching based on Callendar van Dusen coefficients (CvD).

Performance characteristics

Accuracy

• RTD resistance thermometer as per IEC 60751:
  • Class A: ± (0.15 + 0.002 · |t|) °C
  • Class AA (formerly 1/3 Cl. B): ± (0.1 + 0.0017 · |t|) °C
  • Class B: ± (0.3 + 0.005 · |t|) °C
  • ¹ |t| = absolute temperature value in °C.
  • Tolerances in °F are obtained by multiplying °C results by 1.8.
• RTD maximum error type TF: Accuracy graphs are provided showing deviations for classes A, AA, and B.

Insulation resistance

• ≥ 100 MΩ at ambient temperature, measured between terminals and outer jacket with a minimum of 100 VDC.

Self heating

• Negligible when an Endress+Hauser iTEMP temperature transmitter is connected due to a very small measurement current.

Mounting

• Orientation: No restrictions.
• Installation instructions: Drilling templates for wall mounting are provided with dimensions in mm (in).

Environment

• Ambient temperature range:
  • TA30A terminal head without mounted head transmitter: –50 to +150 °C (–58 to +302 °F) (without cable gland), –50 to +100 °C (–58 to +212 °F) (with cable gland).
  • TA30 PCB plastic housing without mounted head transmitter: –40 to +100 °C (–40 to +212 °F).
  • Terminal head with mounted head transmitter: –40 to +85 °C (–40 to +185 °F).
• Storage temperature: Refer to "Ambient temperature range".
• Degree of protection:
  • Terminal head: IP66/68 (NEMA Type 4x encl.).
  • Plastic housing: IP65.
• Shock and vibration resistance: 4G / 2 to 150 Hz in accordance with IEC 60068-2-6.

Process

• Process pressure range: Maximum static process pressure: 1 bar (14.5 PSI) at 20 °C (68 °F).

Mechanical construction

Dimensions are provided in mm (in). Specifications are without the head transmitter installed.

• Plastic housing: Gray (RAL 7035), M16 cable entry thread.
• Terminal head: Blue head (RAL 5012), gray cap (RAL 7035), internal and external ground terminal, G½", ½" NPT, or M20x1.5" cable entry thread.
• Weight: 200 to 500 g (7.05 to 17.64 oz), configuration dependent.

Materials

• Temperature sensor: Anodized aluminum.
• Housing: Plastic housing made of polycarbonate (PC) or terminal head made of aluminum with polyester powder coating.

Certificates and approvals

Current certificates and approvals are available on the Endress+Hauser website. The product complies with WELMEC 8.8, OIML R117-1, EN 12405-1/A2, and OIML R140-1.

Ordering information

Detailed ordering information is available from sales organizations or the Product Configurator on the Endress+Hauser website.

Accessories

Available accessories can be found on the Endress+Hauser website. This includes software tools such as Applicator, Product Configurator, DeviceCare SFE100, and FieldCare SFE500.

Documentation

Various documentation types are available on the Endress+Hauser website, including Technical Information (TI), Brief Operating Instructions (KA), Operating Instructions (BA), Description of Device Parameters (GP), and Safety Instructions (XA).

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Disclaimer: Extraction may miss figures, footnotes, or revisions; contractual data must match the OEM PDF revision used on the project.

Official datasheet (PDF)

Lenntech datasheet mirror