iTemp TMT84

Summary

Product Identification

• Product Name: iTEMP TMT84
• Type: Dual-input temperature transmitter with PROFIBUS® PA protocol
• Document: TI00138R/09/EN/07.21-00

Application

• Converts various input signals (resistance thermometers, thermocouples, resistance, voltage) into digital output signals via PROFIBUS® PA.
• Designed for reliability, long-term stability, and high precision with advanced diagnostic functions.
• Suitable for critical processes and hazardous areas, with FISCO/FNICO conformity (IEC 60079-27) for explosive atmospheres.
• Can be installed in terminal head form B (DIN EN 50446) or in a field housing for Ex d applications.

Input

Measured Variables

• Temperature (temperature-linear transmission)
• Resistance (Ω)
• Voltage (mV)

Input Types and Ranges

Resistance Thermometers (RTD) as per standard:

• IEC 60751:2008:
  • Pt100: –200 to +850 °C
  • Pt200: –200 to +850 °C
  • Pt500: –200 to +250 °C
  • Pt1000: –200 to +250 °C
• JIS C1604:1984:
  • Pt100: –200 to +649 °C
• DIN 43760 IPTS-68:
  • Ni100: –60 to +250 °C
  • Ni1000: –60 to +150 °C
• Edison Copper Winding No. 15:
  • Cu10: –100 to +260 °C
• GOST 6651-94:
  • Pt50: –200 to +1 100 °C
  • Pt100: –200 to +850 °C
• OIML R84:2003 / GOST 6651-2009:
  • Cu50: –200 to +200 °C
  • Cu100: –200 to +200 °C

Resistance Transmitter:

• 10 to 400 Ω
• 10 to 2 000 Ω

Thermocouples (TC) as per standard:

• IEC 60584, Part 1:
  • Type A (W5Re-W20Re): 0 to +2 500 °C
  • Type B (PtRh30-PtRh6): +40 to +1 820 °C
  • Type E (NiCr-CuNi): –270 to +1 000 °C
  • Type J (Fe-CuNi): –210 to +1 200 °C
  • Type K (NiCr-Ni): –270 to +1 372 °C
  • Type N (NiCrSi-NiSi): –270 to +1 300 °C
  • Type R (PtRh13-Pt): –50 to +1 768 °C
  • Type S (PtRh10-Pt): –50 to +1 768 °C
  • Type T (Cu-CuNi): –260 to +400 °C
• IEC 60584, Part 1; ASTM E988-96:
  • Type C (W5Re-W26Re): 0 to +2 315 °C
  • Type D (W3Re-W25Re): 0 to +2 315 °C
• DIN 43710:
  • Type L (Fe-CuNi): –200 to +900 °C
  • Type U (Cu-CuNi): –200 to +600 °C
• GOST R8.585-2001:
  • Type L (NiCr-CuNi): –200 to +800 °C

Voltage Transmitter (mV):

• –20 to 100 mV
• –5 to 30 mV

Connection Types

• Supports 2-wire, 3-wire, or 4-wire connection for RTD and resistance transmitters.
• Sensor current: ≤ 0.3 mA.
• With 2-wire circuit, compensation of wire resistance is possible (0 to 30 Ω).
• With 3-wire and 4-wire connection, sensor wire resistance up to max. 50 Ω per wire.
• Maximum sensor wire resistance for thermocouples and mV transmitters: 10 kΩ.
• Internal reference junction (Pt100) or external preset value (-40 to +85 °C).
• The two sensor inputs are not galvanically isolated from each other.

Output

• Protocol: PROFIBUS® PA (in accordance with EN 50170 Volume 2, IEC 61158-2, Manchester II encoding).
• Baudrate: 31.25 kBit/s.
• Failure current (FDE): 0 mA.
• Output Data (via AI blocks): Temperature (PV), temperature sensor 1 & 2, terminal temperature.
• Galvanic Isolation: U = 2 kV AC (input/output).
• Current Consumption: ≤ 11 mA.
• Switch-on Delay: 8 s.

Performance Characteristics

Measured Errors

• Accuracy is specified in accordance with DIN EN 60770.
• Digital values are transmitted via FIELDBUS®.
• Example for Pt100 (IEC 60751:2008), 0 to +200 °C:
  • Typical measured error (digital value): 0.08 °C
  • Maximum measured error (digital value): ≤ 0.12 °C
  • Non-repeatability (digital value): 0.06 °C + 0.006% * (MV - LRV)
• Example for Type K (IEC 60584-1), 0 to +800 °C:
  • Typical measured error (digital value): 0.31 °C
• Example for Resistance Transmitter, 10 to 400 Ω:
  • Measured error (digital value): 32 mΩ
  • Non-repeatability (digital value): 15 mΩ

Operating Influences

• Ambient Temperature and Supply Voltage: Influence values are specified per 1 °C change in ambient temperature and per 1 V change in supply voltage for various sensor types.
  • Example for Pt100 (IEC 60751:2008):
    • Ambient temperature influence (digital, maximum): ≤ 0.12 °C
    • Supply voltage influence (digital, maximum): ≤ 0.12 °C
  • Example for Type K (IEC 60584-1):
    • Ambient temperature influence (digital, maximum): ≤ 0.04 °C
    • Supply voltage influence (digital, maximum): ≤ 0.04 °C

Long-Term Drift

• Resistance Thermometers (RTD):
  • Example for Pt100 (IEC 60751:2008):
    • After 1 year: ≤ 0.03 °C + 0.024% * measuring span
    • After 3 years: ≤ 0.042 °C + 0.035% * measuring span
    • After 5 years: ≤ 0.051 °C + 0.037% * measuring span
• Thermocouples (TC):
  • Example for Type K (IEC 60584-1):
    • After 1 year: ≤ 0.09 °C + 0.017% * (MV + 150 °C)
    • After 3 years: ≤ 0.14 °C + 0.023% * measuring span
    • After 5 years: ≤ 0.19 °C + 0.024% * measuring span

Mechanical / Hydraulic

Installation

• Terminal head: Form B (flat face) as per DIN EN 50446.
• Field housing: Available for Ex d applications.
• Mounting: Wall or pipe mounting, or clip-on DIN rail (IEC 60715).
• Dimensions (Head Transmitter): 24.1 mm (width), 33 mm (height), 44 mm (depth).
• Cable Glands: M20x1.5, NPT ½" (depending on housing type).

Materials

• Housing (Head Transmitter): Polycarbonate (PC).
• Terminals: Screw terminals (nickel-plated brass), Push-in terminals (tin-plated brass).
• Field Housings: Aluminum (polyester powder coated) or Stainless Steel 316L.

Environmental Conditions

• Ambient Temperature Range: –40 to +85 °C (for hazardous areas, refer to Ex documentation).
• Storage Temperature: –40 to +100 °C.
• Humidity: Max. 95% relative humidity (condensation permitted).
• Climate Class: C as per EN 60654-1.
• Degree of Protection:
  • Head transmitter (installed): Depends on terminal head or field housing.
  • With field housing TA30A, TA30D, TA30H: IP 66/67 (NEMA Type 4x).
• Vibration Resistance: As per IEC 60068-2-6 (10 to 2000 Hz at 5g).
• Electromagnetic Compatibility (EMC): CE compliant, meets IEC/EN 61326 series and NAMUR Recommendation EMC (NE21). Interference emission Class B.

Electrical

Power Supply

• Supply Voltage: 9 to 32 V DC (polarity-independent), max. voltage Ub = 35 V.
• Power Source: Powered via PROFIBUS® PA bus.

Operability

• Local Operation: Head transmitter has no display. Optional attachable measured value display TID10 available. DIP switches on TID10 for hardware settings (e.g., write protection).
• Remote Operation: Configuration via PROFIBUS® PA communication using configuration software (e.g., Endress+Hauser FieldCare, SIMATIC PDM).
• Bus Address: Set via configuration software or DIP switches on optional display.

Standard Diagnostic Functions

• Sensor cable diagnostics (cable break, short-circuit, corrosion).
• Incorrect wiring detection.
• Internal device errors.
• Overrange/underrange detection.
• Ambient temperature out-of-range detection.
• Corrosion detection as per NAMUR NE89.
• Low voltage detection.

2-Channel Functions

• Sensor backup (switches to second sensor upon primary failure).
• Drift warning or alarm based on deviation between sensors.
• Temperature-dependent switching between sensors.
• Mean value or differential measurement from two sensors.

Certifications and Approvals

• PROFIBUS® PA certification by PNO (PROFIBUS® User Organization).
• Certified in accordance with PROFIBUS® PA Profile 3.02.
• Interoperable with certified devices from other manufacturers.
• Intrinsically safe apparatus for Zone 1 hazardous areas.

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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)

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