Easytemp TMR31

Summary

Product Identification

The Endress+Hauser Easytemp TMR31 and TMR35 are compact RTD thermometers for industrial and hygienic applications. They utilize a Pt100 sensor and can be equipped with an integrated transmitter for a 4 to 20 mA output.

Applications

Designed for general or hygienic use in the Food & Beverages and Life Sciences industries, particularly in compact vessels and pipes where short immersion lengths and reliable measurement are advantageous.

Operating Limits

• Measuring Range:
  • –50 to +150 °C (–58 to +302 °F)
  • With extension neck: up to +200 °C (392 °F)
• Pressure Range: Up to 100 bar (1,450 psi)
• Ambient Temperature Range: –40 to +85 °C (–40 to +185 °F)
• Storage Temperature: –40 to +85 °C (–40 to +185 °F)
• Operating Altitude: Up to 2,000 m (6,600 ft)
• Climate Class: In accordance with IEC/EN 60654-1, class C.

Feed Water

• Process Temperature Range:
  • Device version without electronics: –50 to +200 °C (–58 to +392 °F)
  • Device version with electronics: –50 to +150 °C (–58 to +302 °F) without extension neck, –50 to +200 °C (–58 to +392 °F) with extension neck.
• Process Pressure Range: See the official PDF for exact tabulated values.
• Medium: Gaseous or liquid.

Product Water

• Output Signal:
  • Without electronics: Pt100 (4-wire connection), accuracy class A (IEC 60751).
  • With electronics: 4 to 20 mA, linear.
• Signal on Alarm (4 to 20 mA mode):
  • Underranging: Linear drop from 4.0 to 3.8 mA.
  • Overranging: Linear increase from 20.0 to 20.5 mA.
  • Failure (e.g., sensor defective): ≤ 3.6 mA (low) or ≥ 21 mA (high) can be selected. High alarm setting adjustable between 21.5 mA and 23 mA.

Electrical

• Supply Voltage: 10 to 35 VDC.
• Input Current Required: ≤ 3.5 mA for 4 to 20 mA output.
• Maximum Current Consumption: ≤ 23 mA for 4 to 20 mA output.
• Switch-on Delay: 2 s.
• Overvoltage Protection: Device operates up to 35 VDC; above this, specified characteristics are not guaranteed. Below ~7 V, the device switches off.
• Electrical Safety: Protection class III, Overvoltage category II, Pollution level 2.

Mechanical / Hydraulic

• Protection Class: IP69K (standard for M12 connection).
• Material: AISI 316L (corresponds to 1.4404 or 1.4435) is recommended for continuous use in air up to 650 °C (1202 °F).
• Surface Roughness:
  • Standard surface, mechanically polished: Ra ≤ 0.76 µm (30 µin).
  • Mechanically polished, buffed: Ra ≤ 0.38 µm (15 µin).
  • Mechanically polished, buffed and electropolished: Ra ≤ 0.38 µm (15 µin) + electropolished.
• Dimensions: Variable installed lengths from 40 to 600 mm (1.57 to 23.6 in). See the official PDF for detailed dimension drawings for general and hygienic applications.
• Weight: 0.2 to 2.5 kg (0.44 to 5.5 lbs) for standard versions.
• Sensor Response Time (t90): < 2 s in water at 0.4 m/s (1.3 ft/s).
• Electronics Response Time: Max. 1 s.
• Permitted Flow Velocity: See the official PDF for diagrams showing permitted flow velocity depending on insertion length for water and superheated steam.
• Process Connections: Various options available for industrial and hygienic applications including:
  • Metric threaded process connections (e.g., M14x1.5, M18x1.5)
  • Threaded process connections (e.g., G¼", G½", ANSI NPT ½", BSPT R ½")
  • Hygienic connections:
    • Aseptic pipe union according to DIN 11864-1, Form A (Pmax. = 40 bar)
    • Milk pipe connection according to DIN 11851 (Pmax. up to 40 bar)
    • Clamp according to ISO 2852 (Pmax. up to 16 bar)
    • APV Inline (Pmax. = 25 bar)
    • Varivent® (Pmax. up to 10 bar)
    • Metal sealing system G½" (Pmax. = 16 bar)
    • Weld-in adapter (Pmax. up to 40 bar)

Certificates and Approvals

• 3-A mark, EHEDG certification, ASME BPE conformity, FDA, EC 1935/2004, EN 2023/2006, TSE/ADI (for TMR35).
• Marine approval according to DNV GL.
• Device safety according to EN 61010-1.
• Electromagnetic compatibility as per NAMUR NE21.

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