Temperature transmitter iTEMP TMT31 for accurate and reliable RTD measurements

4-20 mA temperature transmitter as head or DIN rail device with one RTD or one TC sensor input suitable for use in zone 2 (Ex ec) / Div. 2 areasField of application

The iTEMP TMT31 is a reliable, long-term stable, single-channel 4 to 20 mA temperature transmitter for thermometers with terminal head Form B suited for use in Zone 2 / Div. 2 areas. Individual transmitter-sensor matching with Callendar-Van Dusen linearization further improves your temperature measurement accuracy for RTD sensors. Push-in terminals for quick wiring facilitate installation. The device is available pre-configured or can easily be parametrized using free software tools.
 

• Highly accurate and reliable temperature measurement for various industrial and hygienic process applications
• Certified for use in Zone 2 (Ex ec) / Div. 2 areas
• Input: Single RTD sensor input for Pt100 or Pt1000 (2-/3- or 4-wire) sensors
• Output: 4 to 20 mA analog output
• Configurable or factory-set fixed parameters
• Installation in terminal heads Form B as per DIN EN 50446

Benefits

• Push-in terminals for fast, tool-free wiring during installation or maintenance
• Simple parametrization via free software tools (requires FXA291 or TXU10)​
• Transmitter-sensor matching using Callendar-Van Dusen linearization for critical measurement points​
• Improved RTD measurement accuracy up to 0.1 K and long-term stability
• Diagnostics information according to NAMUR NE 107
• Ready-to-use: Factory pre-configured

Application examples

1. A sensor (RTD or thermocouple) with transmitter in remote installation via DIN rail transmitter

2. Installed head transmitter - 1 x RTD/TC wired directly

Endress+Hauser offers a comprehensive range of industrial thermometers with resistance sensors or thermocouples. When combined with the temperature transmitter, these components form a complete measuring point for a wide range of applications in the industrial sector. The temperature transmitter is a 2-wire device with one measuring input and one analog output. It is used for instrumentation in terminal head form B (flat face) according to DIN EN 50446 or as a DIN rail device for installation in a cabinet on a mounting rail TH35 according to EN 60715.

Standard diagnostic functions

• Cable open-circuit, short-circuit of sensor wires

• Incorrect wiring

• Internal device errors

• Overrange and underrange detection

• Device temperature overrange/underrange detection

• Low voltage detection

Output simulation: Simulation of the 4 to 20 mA output signal

Output signal

 Analog output: 4 to 20 mA, 20 to 4 mA (can be inverted)

Filter: 1st order digital filter: 0 to 120 s / Network frequency filter: 50/60 Hz (cannot be adjusted)

Switch-on delay:≤ 5 s, until the first valid measured value signal is present at the current output. While switch-on delay = Ia ≤ 3.8 mA

Supply voltage: 

Values for non-hazardous areas, protected against polarity reversal: 10 V ≤ Vcc ≤ 36 V (standard) Values for hazardous area, see Ex documentation.

Galvanic isolation (TC):Galvanic isolation (TC)

Current consumption:3.5 to 22.5 mA