iTemp TMT72

Summary

Product identification

• Product name: iTEMP TMT72
• Product type: Temperature transmitter
• Document: TI01392T/09/EN/05.22-00

Application

The iTEMP TMT72 is a universal temperature transmitter with HART® communication. It converts various input signals into a scalable, analog 4 to 20 mA output signal. Key features include reliability, long-term stability, high precision, and advanced diagnostic functions.

• Input compatibility: Resistance thermometers (RTD), thermocouples (TC), resistance (Ω), and voltage (mV).
• Installation options:
  • Form B terminal head (flat face)
  • Optional field housing for Ex d applications
  • Optional DIN rail mounting

Benefits

• Safe operation in hazardous areas due to international approvals.
• Reliable operation through sensor and device monitoring.
• Diagnostics information according to NAMUR NE107.
• Optional attachable measured value display (TID10).
• Optional integrated Bluetooth® interface for wireless display and configuration via E+H SmartBlue app.
• Fast, tool-free wiring with optional push-in terminal technology.

Input

Measured Variable

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

Measuring Ranges

Resistance Thermometers (RTD)

• IEC 60751:2008: Pt100, Pt200, Pt500, Pt1000
  • Ranges: e.g., Pt100 from –200 to +850 °C (–328 to +1 562 °F)
  • Min. span: 10 K (18 °F)
• JIS C1604:1984: Pt100
  • Range: –200 to +510 °C (–328 to +950 °F)
  • Min. span: 10 K (18 °F)
• DIN 43760 IPTS-68: Ni100, Ni120
  • Ranges: e.g., Ni100 from –60 to +250 °C (–76 to +482 °F)
  • Min. span: 10 K (18 °F)
• GOST 6651-94: Pt50, Pt100
  • Ranges: e.g., Pt100 from –200 to +850 °C (–328 to +1 562 °F)
  • Min. span: 10 K (18 °F)
• OIML R84: 2003, GOST 6651-2009: Cu50, Cu100, Ni100, Ni120, Cu50
  • Ranges: e.g., Cu50 from –180 to +200 °C (–292 to +392 °F)
  • Min. span: 10 K (18 °F)
• Connection types: 2-wire, 3-wire, or 4-wire.
• Sensor current: ≤ 0.3 mA.
• Wire resistance compensation (2-wire): 0 to 30 Ω.
• Sensor wire resistance (3-wire, 4-wire): up to max. 50 Ω per wire.

Resistance Transmitter

• Resistance: 10 to 400 Ω or 10 to 2 000 Ω.
• Min. span: 10 Ω.

Thermocouples

• IEC 60584, Part 1 / ASTM E230-3:
  • Type A, B, E, J, K, N, R, S, T
  • Ranges: e.g., Type K from –270 to +1 372 °C (–454 to +2 501 °F)
  • Min. span: 50 K (90 °F)
• ASTM E988-96:
  • Type C, D
  • Ranges: e.g., Type C from 0 to +2 000 °C (+32 to +3 632 °F)
  • Min. span: 50 K (90 °F)
• DIN 43710:
  • Type L, U
  • Ranges: e.g., Type L from –200 to +900 °C (–328 to +1 652 °F)
  • Min. span: 50 K (90 °F)
• GOST R8.585-2001:
  • Type L
  • Range: –200 to +800 °C (–328 to +1 472 °F)
  • Min. span: 50 K (90 °F)
• Internal reference junction: Pt100.
• External preset reference junction: Configurable value –40 to +85 °C (–40 to +185 °F).
• Maximum sensor wire resistance: 10 kΩ.

Voltage Transmitter (mV)

• Range: –20 to 100 mV.
• Min. span: 5 mV.

Output

• Output signal: Analog 4 to 20 mA (20 to 4 mA, invertible).
• Signal encoding: FSK ±0.5 mA via current signal.
• Data transmission rate: 1200 baud.
• Galvanic isolation: U = 2 kV AC for 1 minute (input/output).
• Failure information: As per NAMUR NE43.
  • Underranging: Linear decrease from 4.0 to 3.8 mA.
  • Overranging: Linear increase from 20.0 to 20.5 mA.
  • Failure (e.g., sensor failure, short-circuit): ≤ 3.6 mA ("low") or ≥ 21 mA ("high"). The "high" alarm can be set between 21.5 mA and 23 mA.

Load

• Maximum load (head transmitter): Rb max.= (Ub max. - 10 V) / 0.023 A.

Linearization/Transmission Behavior

• Temperature-linear
• Resistance-linear
• Voltage-linear

Filter

• Mains filter: 50/60 Hz.
• Digital filter (1st order): 0 to 120 s.

Protocol-Specific Data (HART®)

• Manufacturer ID: 17 (0x11)
• Device type ID: 0x11D0
• HART® specification: 7
• Device address (multi-drop): Software setting 0 to 63.
• HART load: Minimum 250 Ω.
• HART device variables: Primary value (PV), Sensor (measured value), SV, TV, QV (device temperature, sensor values).
• Wireless HART: Minimum starting voltage 10 VDC, start-up current 3.58 mA, starting time 7 s. Minimum operating voltage 10 VDC, multidrop current 4.0 mA, time for connection setup 9 s.

Write Protection

• Hardware: DIP switch on optional display for head transmitter.
• Software: User role concept with password assignment.

Switch-on Delay

• ≤ 7 s until the first measured value signal and HART® communication are available.

Power Supply

• Supply voltage (non-hazardous areas):
  • Head transmitter: 10 V ≤ Vcc ≤ 36 V.
  • DIN rail device: 11 V ≤ Vcc ≤ 36 V.
• Supply voltage (hazardous areas): Refer to Ex documentation.
• Current consumption: 3.6 to 23 mA.
• Minimum current consumption: 3.5 mA.
• Current limit: ≤ 23 mA.

Electrical Connection

Terminals

• Head transmitter: Terminals A (Sensor input, RTD/Ω, 4-/3-/2-wire), B (Sensor input, TC/mV), C (Bus terminator/power supply), D (Display/CDI interface).
• DIN rail device: Terminals A (Sensor input, TC/mV), B (Sensor input, RTD/Ω, 4-/3-/2-wire), C (Power supply 4-20 mA).
• Cable shielding: Recommended for sensor cable lengths of 30 m (98.4 ft) or more.

Terminal Design

• Screw terminals: Rigid or flexible cable, ≤ 2.5 mm² (14 AWG); Field housing: 2.5 mm² (12 AWG) plus ferrule.
• Push-in terminals: Rigid or flexible cable, 0.2 to 1.5 mm² (24 to 16 AWG); Flexible with wire end ferrules: 0.25 to 1.5 mm² (24 to 16 AWG).

Performance Characteristics

Response Time

• Resistance thermometer (RTD) & resistance (Ω): ≤ 1 s.
• Thermocouples (TC) & voltage (mV): ≤ 1 s.
• Reference temperature: ≤ 1 s.

Refresh Time

• Approx. 100 ms.

Reference Operating Conditions

• Calibration temperature: +25 °C ±3 K.
• Supply voltage: 24 V DC.
• Circuit: 4-wire for resistance adjustment.

Maximum Measured Error

Errors are typically given as ±2 σ (Gaussian distribution) and include non-linearities and repeatability.

• Resistance Thermometers (RTD):

  • IEC 60751:2008 Pt100: Typical error 0.07 °C digital, 0.10 °C at current output.
  • GOST 6651-94 Pt100: Typical error 0.06 °C digital, 0.09 °C at current output.
  • See document for detailed error specifications for various RTD types, including digital, D/A, and maximum errors.

• Thermocouples (TC):

  • IEC 60584-1 Type K: Typical error 0.60 °C digital, 0.64 °C at current output (0 to +800 °C range).
  • IEC 60584-1 Type S: Typical error 1.83 °C digital, 1.84 °C at current output.
  • See document for detailed error specifications for various TC types.

• Voltage Transmitter (mV):

  • Maximum error: ± 10.0 µV (digital).

Sensor Adjustment

• Sensor-transmitter matching: Utilizes Callendar-Van Dusen coefficients (Pt100) or polynomial equations (Cu/Ni RTDs) for improved accuracy.
• 1-point adjustment: Shifts sensor value (offset).
• Current output adjustment: Correction of 4 or 20 mA output.

Operating Influences

Influence values for ambient temperature and supply voltage are detailed for RTD, resistance, thermocouple, and voltage measurements. These are provided for digital (HART®) and analog (D/A) outputs, with maximum values and percentage-based influences.

Long-Term Drift

Long-term drift is specified for resistance thermometers and thermocouples over periods of 1 month to 5 years, with values expressed as a percentage of the measured value or a fixed temperature/resistance value. Analog output drift is also specified.

Installation

Mounting Location

• Terminal head Form B: Direct installation.
• Field housing: Wall or pipe mounting.
• DIN rail: Clip onto TH35 mounting rail (IEC 60715).

Orientation

• DIN rail devices with thermocouple/mV measurements may show deviations depending on orientation and adjacent devices (up to ±1.34 °C or +2.94 °C).

Environment

• Ambient temperature range: –40 to +85 °C (–40 to +185 °F) (non-hazardous areas).
• Storage temperature:
  • Head transmitter: –50 to +100 °C (–58 to +212 °F).
  • DIN rail device: –40 to +100 °C (–40 to +212 °F).
• Altitude: Up to 4000 m.
• Humidity:
  • Head transmitter: Condensation permitted.
  • DIN rail transmitter: Condensation not permitted.
  • Max. rel. humidity: 95%.
• Climate class: C1 (head transmitter), B2 (DIN rail device).
• Degree of protection:
  • Head transmitter (screw terminals): IP 00.
  • Head transmitter (push-in terminals): IP 30.
  • Head transmitter (in field housing TA30A/D/H): IP 66/68 (NEMA Type 4x).
  • DIN rail device: IP 20.
• Shock and vibration resistance:
  • Head transmitter: 2 to 100 Hz at 4g.
  • DIN rail device: 2 to 100 Hz at 0.7g.
• Electromagnetic compatibility (EMC): Meets IEC/EN 61326 series and NAMUR NE21. Interference emission Class B.
• Overvoltage category: II.
• Degree of contamination: 2.

Mechanical Construction

Design, Dimensions

• Head transmitter: Dimensions provided for screw terminal and push-in terminal versions.
• DIN rail device: Dimensions provided, with housing height varying by terminal version.
• Field housing (TA30A, TA30H, TA30D): Dimensions and specifications for various configurations, including options with display windows.

Weight

• Head transmitter: Approx. 40 to 50 g (1.4 to 1.8 oz).
• DIN rail device: Approx. 100 g (3.53 oz).
• Field housing: See individual specifications (e.g., TA30A approx. 330 g, TA30H aluminum approx. 640 g).

Materials

• All materials are RoHS-compliant.
• Housing: Polycarbonate (PC).
• Terminals: Screw terminals (nickel-plated brass), Push-in terminals (tin-plated brass).
• Potting compound: Specific types for head transmitter and DIN rail housing.

Operability

Local Operation

• Head transmitter: No integrated display or controls; uses optional attachable display TID10.
• DIN rail device: Features Power LED, Status LED, and Service interface for configuration tools.
• HART® communication: Configuration via HART® or CDI interface.

Bluetooth® Wireless Technology

• Optional interface for operation and configuration via SmartBlue app.
• Range: 10 m (terminal head/field housing with display window/DIN rail housing), 5 m (terminal head/field housing).
• Encrypted communication and password protection.
• Bluetooth® interface can be deactivated.
• Simultaneous use with attachable display is not possible.

Certificates and Approvals

• CE mark: Confirms compliance with EC directives.
• EAC mark: Confirms compliance with EEU guidelines.
• Ex approval: Information available upon request (ATEX, FM, CSA).
• CSA C/US: Certified to specific US standards.
• HART® certification: Meets HART® Communication Protocol Specifications, Revision 7.
• Marine approvals: Available (refer to product configurator).
• Radio approval: Available.

MTTF

See official PDF for specific Mean Time To Failure values.

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