iTherm Moduline TM131

Summary

Product identification

The iTHERM ModuLine TM131 is an innovative, highly modular, and robust RTD or TC thermometer designed for a wide range of industrial applications.

Application

• For universal use.
• Measuring range: –200 to +1,100 °C (–328 to +2,012 °F).
• Pressure range up to 100 bar (1,450 psi).
• Vibration-resistant sensor elements up to 60g.
• Improved ease of maintenance: sensor replacement without process shutdown and easy, safe recalibration.

Measuring principle

• Resistance thermometers (RTD): Utilize a Pt100 sensor with a resistance of 100 Ω at 0 °C. Available as wire-wound (WW) or thin-film (TF) sensors. TF sensors offer smaller sizes and better vibration resistance.
• Thermocouples (TC): Employ the Seebeck effect to measure temperature differences. Standardized types include J, K, and N.

Measuring system components

• Power supply unit/barrier
• Display units
• Surge arrester

Modular design

The thermometer features a modular design with several configurable options:

• Terminal head: Available in aluminum, polyamide, or stainless steel.
• Wiring, electrical connection, output signal: Options include ceramic terminal blocks, flying leads, and head transmitters with various output protocols (4 to 20 mA, HART®, Ethernet-APL, PROFIBUS® PA, FOUNDATION™ Fieldbus, IO-Link®).
• Plug or cable gland: Polyamide or brass cable glands, M12, and 7/8" plugs are available.
• Removable extension neck: Various options including QuickNeck for tool-free insert removal.
• Lagging: Provides space between the thermometer and process connection.
• Process connection: Various threaded, flanged, and compression fittings.
• Thermowell: Versions with and without thermowells, available in various diameters, materials, and tip types.
• Insert: Features sensor models like iTHERM QuickSens (fastest response times) and iTHERM StrongSens (high vibration resistance). Available in RTD (wire wound or thin-film) or thermocouple types (K, J, or N).

Input

• Measured variable: Temperature.
• Measuring range: Varies by sensor type.
  • Pt100 thin-film (TF), basic: –50 to +200 °C (–58 to +392 °F)
  • Pt100 thin film (TF), standard: –50 to +400 °C (–58 to +752 °F)
  • Pt100 thin film (TF), iTHERM StrongSens: –50 to +500 °C (–58 to +932 °F)
  • Pt100 wire wound (WW), extended: –200 to +600 °C (–328 to +1,112 °F)
  • Thermocouple TC, type J: –40 to +750 °C (–40 to +1,382 °F)
  • Thermocouple TC, type K: –40 to +1,100 °C (–40 to +2,012 °F)
  • Thermocouple TC, type N: (Measuring range not specified in extract)

Output

The measured value can be transmitted directly-wired or via an Endress+Hauser iTEMP transmitter.

• Output signal:
  • Analog output 4 to 20 mA, HART® (optional SIL transmitter).
  • PROFIBUS® PA, FOUNDATION™ Fieldbus™, PROFINET® with Ethernet-APL, IO-Link®.

Power supply

• Sensor connection wires are equipped with terminal lugs with a nominal diameter of 1.3 mm (0.05 in).
• Details on terminal assignment for RTD and thermocouple sensor connections are provided, along with diagrams for various head-mounted and field transmitters.

Performance characteristics

• Maximum measurement error: Tolerances for RTD resistance thermometers as per IEC 60751 (Class B, A, AA) are specified. Permissible deviation limits for thermocouples as per IEC 60584 and ASTM E230/ANSI MC96.1 are also provided.
• Response time: Typical values in seconds (s) for t50 and t90 are provided for various thermowell diameters, tip types, and sensor configurations when tested in water.
• Calibration: Information on calibration methods (fixed-point, reference thermometer), evaluation services, and sensor-transmitter matching is included. Minimum immersion lengths for inserts required for calibration are specified.
• Insulation resistance: RTD and TC insulation resistance values are provided.

Installation

• Orientation: No restrictions, but self-draining should be considered.
• Installation instructions: Guidance on ensuring adequate immersion length for accuracy, especially in pipes, is provided.
• Ambient conditions:
  • Ambient temperature range:
    • Terminal head without transmitter: Depends on head, gland, or connector.
    • Terminal head with transmitter: –40 to +85 °C (–40 to +185 °F).
    • Terminal head with transmitter and display: –20 to +70 °C (–4 to +158 °F).
    • QuickNeck extension neck: –50 to +140 °C (–58 to +284 °F).
  • Humidity: Condensation permitted as per IEC 60 068-2-33, max. 95% relative humidity as per IEC 60068-2-30 with iTEMP transmitters.
  • Climate class: As per EN 60654-1, Class C.

Degree of protection

• Max. IP 66 (NEMA Type 4x encl.), depending on design.
• Partly IP 68, tested in 1.83 m (6 ft) over 24 h.

Shock and vibration resistance

• Inserts exceed IEC 60751 requirements (3g, 10 to 500 Hz).
• Specific vibration resistance values for different sensor types are provided, with iTHERM StrongSens and iTHERM QuickSens (certain versions) reaching up to 600 m/s² (60g).

Process

• Process temperature range: Max. –200 to +1,100 °C (–328 to +2,012 °F), dependent on sensor type and thermowell material.

Disclaimer: This 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