iTemp TMT188

Summary

Product identification

• Product Name: iTEMP TC TMT 188
• Type: Temperature head transmitter for thermocouples (TC)
• Application: For installation in a sensor head Form B. Fixed adjusted temperature head transmitter for converting TC input signals into a 4 to 20 mA analogue output signal.

Features and benefits

• Fixed adjusted measurement range for thermocouples (TC)
• 2 wire technology, 4 to 20 mA analogue output
• High accuracy in total ambient temperature range
• Fault signal on sensor break or short circuit, presettable to NAMUR NE 43
• EMC to NAMUR NE 21, CE
• UL recognized component to UL 3111-1
• GL ship building approval
• Ex-Certification:
  • ATEX Ex ia and dust zone 22 in compliance with EN 50281-1
  • FM IS
  • CSA IS
• Galvanic isolation

Input

Thermocouples (TC)

• Cold junction: Internal (Pt100)
• Cold junction accuracy: ± 1 K
• Sensor current: 30 mA

Output

• Output signal: 4 to 20 mA
• Transmission: Temperature linear
• Max. load: (Vpower supply - 8 V) / 0.025 A
• Input current required: ≤ 3.5 mA
• Current limit: ≤ 25 mA
• Switch on delay: 4 s (during power up Ia = 3.8 mA)
• Reply time: 1 s
• Failure signal (fault monitoring):
  • Measurement range undercut: Linear drop to 3.8 mA
  • Exceeding measurement range: Linear rise to 20.5 mA
  • Sensor breakage; Sensor short circuit: ≥ 21.0 mA

Accuracy

Reference conditions

• Calibration temperature: 23 °C ± 5 K
• Thermocouple (TC) Measurement accuracy:
  • K, J, T, E, L, U: typ. 0.5 K
  • N, C, D: typ. 1.0 K
  • S, B, R, MoRe5-MoRe41: typ. 2.0 K
• Influence of the internal reference junction: Pt100 DIN IEC 751 Cl. B

Application conditions

• Influence of power supply: ≤ ±0.01%/V deviation from 24 V
• Load influence: ≤ ±0.02%/100 Ω
• Temperature drift:
  • Thermocouple (TC): Td = ± (15 ppm/K * max. meas. range + 50 ppm/K * preset meas. range) * ∆ϑ
  • ∆ϑ = Deviation of the ambient temperature according to reference condition.
• Long term stability: ≤ 0.1 K / Year or ≤ 0.05% / Year

Electrical

• Power supply: Ub = 8 to 35 V, polarity protected
• Galvanic isolation (In/out): Û = 3.75 kV AC
• Allowable ripple: Uss ≤ 5 V at Ub ≥ 13 V, fmax. = 1 kHz

Mechanical / hydraulic

• Installation angle: No limit
• Installation area: Connection head according to DIN 43 729 Form B; TAF 10 field housing
• Dimensions: ∅44 mm housing diameter, 22.5 mm height
• Weight: approx. 40 g
• Materials:
  • Housing: PC
  • Potting: PUR
• Terminals: Cable up to max. 1.75 mm² (secure screws)
• Terminal connections: Power supply and current output, SETUP socket

Ambient conditions

• Ambient temperature: -40 to +85 °C (for Ex-areas see Ex-certification)
• Storage temperature: -40 to +100 °C
• Climatic class: To EN 60 654-1, Class C
• Moisture condensation: Allowable
• Ingress protection: IP00 / IP66 installed
• Vibration protection: 4g / 2 to 150 Hz according to IEC 60 068-2-6

Certification

• CE mark: Fulfils EU regulations.
• Ex-certification: Various options available (ATEX, CSA, FM). Refer to specific Ex documentation for hazardous area data.
• UL recognized: Component to UL 3111-1.
• GL approval: Germanische Lloyd ship building approval.

Disclaimer

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