Schneider Electric TM3TI4G Modicon TM3 4-Ch Temperature Module

TM3TI4G: TM3 four-channel thermocouple and RTD input module

The TM3TI4G is a Modicon TM3 analogue input module that reads four channels of temperature directly. It accepts thermocouples of types J, K, N, E, T, R, S, B and C, Pt 100 and Pt 1000 probes, and also standard 4–20 mA, 0–20 mA, 0–10 V and ±10 V signals, with 16-bit resolution.

That breadth makes TM3TI4G the main temperature module of the M221, M241, M251 and M262 range: it avoids separate transmitters when a controller must monitor heaters, ovens, bearings or process lines. Its two-input cousin with an output is TM3TM3G. Seven Star LLC supplies the this unit in Oman and the GCC as an independent supplier based in Muscat.

Connecting sensors to the TM3TI4G

Ten 1.5 mm² terminals at 3.81 mm pitch are provided. The datasheet text describes screw terminals for this model, while the catalogue description includes the word spring, so confirm the terminal style of the delivered unit if your wiring standard requires one type. Use twisted shielded pairs up to 30 m and, for thermocouples, extension or compensating cable of the matching type.

Cold-junction compensation is part of the module function; keep terminals free from draughts and heat sources so the reference junction stays stable.

Technical specifications of the TM3TI4G

The TM3TI4G compared with other TM3 analogue modules

Selection checklist and RFQ details for the TM3TI4G

Check:

• sensor type and range for every channel (thermocouple letter or Pt probe)
• the terminal style needed on site
• the response time against the process
• which controller and how many TM3 slots remain

Send quantity, sensors planned and the delivery point with the RFQ.

Power and housing of the TM3TI4G

The module draws 45 to 50 mA at 5 V DC and 35 to 40 mA at 24 V DC, is 23.6 mm wide, 90 mm high and 70 mm deep and weighs 0.1 kg. It mounts on a 35 mm DIN rail or on a panel using the fixing kit.

Insulation values listed are 1500 V AC between the output and supply and 500 V AC to internal logic, and the cable-length limit is 30 m.

Thermocouple and RTD ranges of the TM3TI4G

The datasheet lists thermocouple J from −200 to 1000 °C, K from −200 to 1300 °C, N from −200 to 1300 °C, E from −200 to 800 °C, T from −200 to 400 °C, R and S from 0 to 1760 °C, B from 0 to 1820 °C and C from 0 to 2315 °C. Resistance probes are Pt 100 from −200 to 850 °C and Pt 1000 from −200 to 600 °C.

Temperature steps are 0.1 °C. Each channel is configured independently, so one module can read a K thermocouple, a Pt 100 and two 4–20 mA signals at the same time.

Temperature monitoring with the TM3TI4G in the Gulf

Typical uses include motor winding and bearing temperature, furnace and heater zones, heat exchanger inlets and outlets, boiler flue gas, and exhaust temperature on engines in standby generators. Heat in the control room is itself a risk, so check the module limits of −10 to 55 °C horizontal and −10 to 35 °C vertical against the panel interior.

Certifications listed are CE, UKCA, RCM, EAC, cULus and cULus HazLoc.

Accuracy and speed of the TM3TI4G

Accuracy is ±0.2 % of full scale at 25 °C for voltage, current, Pt probes and most thermocouple ranges, rising to ±0.4 % on the negative portions of the J, K, E, T and N ranges, with ±6 °C for R and S between 0 and 200 °C. Repeat accuracy is ±0.5 % of full scale and temperature drift is ±0.01 % per °C.

Thermocouple conversion is slow by design: 100 ms plus 100 ms per channel plus one controller cycle, which is fine for thermal processes but not for fast events. Sampling duration is 10 ms.

Documents and quotation

The Schneider Electric datasheet for the this unit is attached on this page, so you can compare the listed values with your design before ordering.

To request a quotation for the TM3TI4G, send the quantity, delivery destination and any project reference through the RFQ form. Seven Star LLC supplies Schneider Electric automation products in Oman and the GCC as an independent supplier based in Muscat, and we confirm stock status and lead time against your request.