RTD TR88, TC88

Summary

Product Identification

• Product Name: TR88 (Resistance Thermometer - RTD) / TC88 (Thermocouple - TC)
• Description: Modular thermometer with extension neck and threaded connection for installation in an existing thermowell. Available with optional head transmitter.

Application

• Universal range of application
• Suitable for installation in existing thermowells
• Degree of protection up to IP68

Operating Limits

Measuring Range

• Resistance insert (RTD): –200 to 600 °C (–328 to 1 112 °F)
• Thermocouple (TC): –40 to 1 100 °C (–40 to 2 012 °F)

Ambient Temperature Range

• Terminal head without mounted head transmitter: Depends on terminal head, cable gland, or fieldbus connector.
• Terminal head with mounted head transmitter: –40 to 85 °C (–40 to 185 °F)
• Terminal head with mounted head transmitter and display: –20 to 70 °C (–4 to 158 °F)

Process Temperature Range

• Maximum: –200 to +1 100 °C (–328 to +2 012 °F), depending on sensor type and thermowell material.

Measuring Principle

Resistance Thermometer (RTD)

• Utilizes Pt100 temperature sensors (100 Ω at 0 °C).
• Types:
  • Wire wound (WW): Larger size, good long-term stability up to 600 °C, sensitive to vibrations.
  • Thin film (TF): Smaller size, better vibration resistance, potential deviation from standard at high temperatures.

Thermocouples (TC)

• Based on the Seebeck effect.
• Measure temperature differences; absolute temperature requires cold junction compensation.
• Standardized in IEC 60584 and ASTM E230/ANSI MC96.1.

Measuring System

• Modular design allowing for easy replacement or calibration of the insert without process interruption.
• Designed for installation in existing thermowells.

Input

Measured Variable

• Temperature (temperature-linear transmission behavior).

Measuring Range (Sensor Type Dependent)

• Pt100 thin-film: –50 to +400 °C (–58 to +752 °F)
• Pt100 thin-film, iTHERM StrongSens: –50 to +500 °C (–58 to +932 °F)
• Pt100 wire wound, 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)

Output

Output Signal

• Directly-wired sensors.
• Via Endress+Hauser iTEMP temperature transmitters with various protocols:
  • Analog output 4 to 20 mA
  • HART®
  • PROFIBUS® PA
  • FOUNDATION Fieldbus™

Head Transmitters (iTEMP)

• Improve accuracy and reliability compared to directly wired sensors.
• Configurable via PC with Endress+Hauser software.
• Features: Dual or single sensor input, optional pluggable display, mathematical functions, sensor monitoring (drift, backup, diagnostics), sensor-transmitter matching.

Power Supply

• Details on sensor connection types for RTD and Thermocouple are provided with diagrams.

Performance Characteristics

Accuracy

• Thermocouples: Permissible deviation limits as per IEC 60584 and ASTM E230/ANSI MC96.1 (Class 1, Class 2).
• RTD: Max. tolerances according to IEC 60751 (Class A, AA, B).

Self-Heating

• Negligible when using an Endress+Hauser iTEMP temperature transmitter.

Response Time

• Tested in accordance with IEC 60751 in flowing water. Values provided for different insert diameters, sensor types (TF, WW, TC), and grounding (grounded/not grounded).

Insulation Resistance

• RTD: > 100 MΩ at 25 °C (between terminals and sheath).
• TC: > 1 GΩ at 20 °C, > 5 MΩ at 500 °C (between terminals and sheath).

Dielectric Strength

• Tested at room temperature for 5 s:
  • ≥ 1 000 V DC for Ø6 mm inserts (between terminals and sheath).
  • ≥ 250 V DC for Ø3 mm inserts (between terminals and sheath).

Calibration

• Methods include calibration at fixed-point temperatures or against a reference thermometer.
• Requires specific immersion lengths for accurate calibration, especially at high temperatures or with head transmitters.
• Sensor-transmitter matching service available to reduce conversion errors.
• Standard calibrations offered from –80 to +600 °C based on ITS90.

Mounting

Orientation

• No restrictions.

Installation Instructions

• Designed for installation in an existing or separately ordered thermowell.
• Insertion length (ML) varies based on thermowell type, with a selectable range of 100 to 5000 mm.

Environment

Shock and Vibration Resistance

• Inserts exceed IEC 60751 requirements (3g, 10-500 Hz).
• Vibration resistance varies by sensor type:
  • Pt100 (WW): > 30 m/s² (3g)
  • Pt100 (TF), enhanced: > 40 m/s² (4g)
  • iTHERM StrongSens Pt100 (TF): > 600 m/s² (60g)
  • Thermocouple inserts: > 30 m/s² (3g)

Electromagnetic Compatibility (EMC)

• Depends on the head transmitter used.

Process

Process Pressure Range

• Maximum process pressure depends on the thermowell. Permitted flow velocity reduces with immersion depth.

Mechanical Construction

Weight

• 0.5 to 2.5 kg (1 to 5.5 lbs) for standard options.

Material

• Extension neck, insert, and process connection:
  • AISI 316L / 1.4404, 1.4435: Recommended max. temp. 650 °C (1 202 °F). Good general corrosion resistance, especially in acidic, non-oxidizing atmospheres.
  • AISI 316Ti / 1.4571: Recommended max. temp. 700 °C (1 292 °F). Similar to 316L with added titanium for intergranular corrosion resistance.
  • Alloy 600 / 2.4816: Recommended max. temp. 1 100 °C (2 012 °F). Good resistance to aggressive, oxidizing, and reducing atmospheres, and chlorinated media.

Process Connection

• Threaded connection: Available in M, G, and NPT threads (e.g., M14x1.5, G 1/2", NPT 1/2").
• Threaded compression fitting (TA50): With SS316 clamping ring, max. process temp. 500 °C (932 °F), max. process pressure 40 bar at 20 °C.

Terminal Heads

• TA30A: IP66/68, –50 to +150 °C, Aluminum.
• TA30A with display: IP66/68, –50 to +150 °C, Aluminum, with TID10 display.
• TA30D: IP66/68, –50 to +150 °C, Aluminum, accommodates two head transmitters.
• TA30P: IP65, –40 to +120 °C, Polyamide, antistatic, for hazardous locations (Ex ia).
• TA20B: IP65, –40 to +80 °C, Polyamide.
• TA21E: IP65, –40 to 130 °C (silicone seal), Aluminum alloy.

Extension Neck

• Influences temperature in the terminal head; must stay within specified limits.

Insert

• RTD Inserts:
  • TPR100: Pt100, 3- or 4-wire, mineral insulated. Measuring range –50 to +400 °C (Class A/AA). Diameters 3 mm, 6 mm.
  • iTHERM TS111: Pt100, 3- or 4-wire, mineral insulated. Enhanced vibration resistance (> 60g). Measuring range –50 to +500 °C (Class A/AA). Diameter 6 mm.
  • TPR100 (wire wound): Pt100, 3- or 4-wire, mineral insulated. Measuring range –200 to +600 °C (Class A/AA). Diameters 3 mm, 6 mm.
• TC Inserts:
  • TPC100: Type K (Alloy 600) or Type J (316L). Measuring range: Type K -40 to 1200 °C (IEC), 0 to 1250 °C (ASTM). Type J -40 to 750 °C (IEC/ASTM). Diameters 3 mm, 6 mm.

Certificates and Approvals

• Available via the Product Configurator on the Endress+Hauser website.

Other Standards and Guidelines

• IEC 60529 (IP code)
• IEC/EN 61010-1
• IEC 60751 (RTDs)
• IEC 60584 and ASTM E230/ANSI MC96.1 (Thermocouples)
• DIN EN 50446 (Terminal heads)

Accessories

• Configuration kits (TXU10)
• Commubox FXA195 (HART)
• Wireless HART adapter (SWA70)

System Components

• RN22: Barrier for 0/4 to 20 mA signals.
• RIA15: Loop-powered 4 to 20 mA process indicator.

Supplementary Documentation

• Technical Information sheets for head transmitters, inserts, and thermowells.
• Supplementary ATEX and IECEx documentation.

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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