RTD MLTTS01

Summary

Product Identification

• Product Name: MLTTS01 Modular thermometer
• Application: Universal range, specifically mentioned for the Oil & Gas industry.

Measuring Principle

The MLTTS01 can utilize two types of temperature sensing elements:

• Resistance Thermometer (RTD):

  • Uses a Pt100 sensor according to IEC 60751.
  • Resistance is 100 Ω at 0 °C (32 °F).
  • Temperature coefficient α = 0.003851 °C⁻¹.
  • Types of RTD elements:
    • Wire Wound (WW): Platinum wire coils in ceramic support, good for up to 600 °C (1 112 °F), but larger and more sensitive to vibrations.
    • Thin Film (TF): Thin platinum layer on a ceramic substrate, smaller and more vibration-resistant. Limit for tight tolerances (Cl. A) is approximately 300 °C (572 °F). Generally used below 400 °C (752 °F).

• Thermocouple (TC):

  • Uses the Seebeck effect.
  • Standardized in IEC 60584 and ASTM E230/ANSI MC96.1.

Operating Limits

• Measuring Range:
  • Resistance insert (RTD): –50 to +500 °C (–58 to +932 °F)
  • Thermocouple (TC): –40 to +1 100 °C (–40 to +2 012 °F)
• Pressure Range: Up to 63 bar (914 psi) depending on process connection.
• Degree of Protection: Up to IP68.
• Ambient Temperature (Terminal Head):
  • Without mounted head transmitter: Depends on terminal head and cable gland/fieldbus connector.
  • With mounted head transmitter: –40 to +85 °C (–40 to +185 °F).
  • With mounted head transmitter and display: –20 to +70 °C (–4 to +158 °F).
• Shock and Vibration Resistance:
  • RTD: 3G / 10 to 500 Hz (IEC 60751).
  • TC: 4G / 2 to 150 Hz (IEC 60068-2-6).

Feed Water (Process Conditions)

• Process Pressure: Maximum process pressure depends on process temperatures and flow velocity. Specific limits for flanges:
  • DN25 PN40: 40 bar (580 psi) at 20 °C (68 °F).
  • DN25 PN63: 63 bar (914 psi) at 20 °C (68 °F).
• Permitted Flow Velocity: Diminishes with increasing immersion length. A Thermowell sizing tool is available on the Endress+Hauser website.

Product Water (Output and Communication)

• Head Transmitter Outputs:
  • Analog output 4 to 20 mA
  • HART®
  • PROFIBUS® PA
  • FOUNDATION Fieldbus™

Electrical

• Power Supply (for transmitter): 24V DC / 30 mA (example using RN221N). Universal power supply 20 to 250 V DC/AC, 50/60 Hz.
• Insulation Resistance:
  • RTD: > 100 MΩ at 25 °C (IEC 60751).
  • TC: > 1 GΩ at 20 °C, > 5 MΩ at 500 °C (IEC 1515).
• Dielectric Strength: ≥1 000 V DC between terminals and insert sheath.
• Self-heating: Negligible when using an Endress+Hauser iTEMP® temperature transmitter.

Mechanical / Hydraulic

• Design: Modular design with standard terminal heads (DIN EN 50446).
• Thermowell Material:
  • AISI 316L (1.4404/1.4435): Max. continuous use 650 °C (1 202 °F).
  • AISI 316Ti (1.4571): Max. continuous use 700 °C (1 292 °F).
  • Inconel 600 (2.4816): Max. continuous use 1 100 °C (2 012 °F).
• Process Connections: Flange connections according to EN 1092-1 (e.g., DN25 PN40, DN25 PN63).
• Dimensions: See diagrams in the original document for detailed dimensions (extension neck length E, immersion length IL, insertion length L).
• Weight: From 1 to 4 kg (2.2 to 8.8 lbs) for standard options.

Accuracy

• RTD Resistance Thermometer (IEC 60751):
  • Class AA (former 1/3): ± (0.1 + 0.0017 · |t|)
  • Class A: ± (0.15 + 0.002 · |t|)
  • Class B: ± (0.3 + 0.005 · |t|)
• Temperature Ranges for Tolerance Classes:
  • Wire Wound (WW): Cl. A (–100 to +450 °C), Cl. AA (–50 to +250 °C).
  • Thin Film (TF): Cl. A (–30 to +300 °C), Cl. AA (–30 to +300 °C).
• Thermocouples: Permissible deviation limits from standard characteristics are provided for IEC 60584 (Class 1 & 2) and ASTM E230/ANSI MC96.1 (Standard and Special tolerance).

Response Time

• Reduced tip, Pt100 TF (16 mm diameter): t₅₀ = 30 s, t<0xE2><0x82><0x90> = 116 s.
• Reduced tip, Thermocouple (ungrounded, 16 mm diameter): t₅₀ = 40 s, t<0xE2><0x82><0x90> = 130 s. (Values calculated at approx. 23 °C ambient, immersed in running water at 0.4 m/s with 10 K excess temperature).

Calibration

• Endress+Hauser provides comparison temperature calibration from –80 to +1 400 °C (–110 to +2 552 °F) traceable to national and international standards. Calibration is performed on the replaceable insert.

Certifications and Approvals

• CE Mark
• Hazardous area approvals (ATEX, CSA, FM - details in separate documentation).
• PED approval (compliant with Pressure Equipment Directive 97/23/EC).
• Material certification (e.g., 3.1 according to EN 10204) available on request.
• Various tests available for thermowells (Helium leak test, Pressure test, PMI, Load capacity calculation, Dye penetration test, Radiographic test).

Accessories

• Communication-specific: Configuration kit TXU10, Commubox FXA195, Commubox FXA291, Wireless HART adapter SWA70, Fieldgate FXA320/FXA520, Field Xpert SFX100.
• System components: Field display unit RIA16, Active barrier RN221N, Supply unit RNS221.
• Software: Applicator, W@M, FieldCare.

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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