Endress+Hauser TMT36 iTEMP IO-Link Head Transmitter

Endress+Hauser TMT36 iTEMP IO-Link head transmitter

The Endress+Hauser TMT36 is an iTEMP single-channel head transmitter with an IO-Link interface. It fits into a form B (flat-face) terminal head to DIN EN 50446 and converts one RTD input into digital IO-Link data, so that a sensor on a machine or skid reaches the PLC through a standard IO-Link master with no analogue card. The TMT36 can be installed in modular thermometers of the Endress+Hauser range to digitalise measuring points that need IO-Link, and it applies Callendar-Van Dusen sensor-transmitter matching to improve accuracy. Seven Star LLC supplies the TMT36 in Oman and the GCC as an independent supplier in Muscat.

TMT36 technical specifications

Input and accuracy of the TMT36

The input is one RTD, Pt100 or Pt1000, in 2-, 3- or 4-wire connection with a sensor current of 0.3 mA or less. In the 2-wire circuit, wire resistance of 0 to 30 Ω can be compensated, and with 3- or 4-wire connection the lead resistance can be up to 50 Ω per wire. Accuracy for Pt100 and Pt1000 over the entire range is 0.15 K or better. The transmitter has no galvanic isolation between input and output.

Output and IO-Link data

The output is the C/Q line: either IO-Link communication or one configurable switch output (PNP, NPN or push-pull) with switching capacity up to 150 mA, with automatic overload protection and a diagnostic message when overloaded. The fault state of the switch output can be set to on, off or high-impedance. The device is an IO-Link Smart Sensor with one measuring and switching channel, and it stores parameters so that a replaced device can be restored automatically from the master. The display of the three highest-priority diagnostic messages helps service staff.

Electrical data and approvals

Supply voltage is 18 to 30 V DC with a current consumption of 11 mA, and the ambient temperature range is −40 to +85 °C according to the label. The documented certification is CSA General Purpose. There is no explosion-protection approval stated in the page data, so the TMT36 is for safe-area use unless the order code indicates otherwise.

Selecting the TMT36

Match the sensor (Pt100 or Pt1000) and the number of wires to the insert in your thermometer, and check that the IO-Link master port is class A and that the master supports the data size of the TMT36. If you need 4 to 20 mA or HART, choose another iTEMP transmitter such as the TMT82 or TMT72 instead.

Installing and commissioning the TMT36

Fit the transmitter into the head on the spring-loaded screws so that the sensor wires land on the push-in or screw terminals and the head cover seals. Connect the M12 cable from the master to the head terminals, assign the IO-Link port and load the parameter set. The measured value and diagnostics then appear in the PLC process image; scale and range limits can be set through IO-Link tools.

TMT36 in Oman and GCC plants

The transmitter is aimed at skids, machines and packaged plant which already use IO-Link, such as filling lines, water-treatment skids and utility modules, where it reduces cabinet hardware and wiring cost. Its use in large-scale oil and gas plant is limited because there it needs HART or fieldbus and an Ex approval.

TMT36 within the iTEMP range

Information to send with a TMT36 RFQ

• Sensor type and wiring
• Head type and thermometer model
• Master and PLC platform
• Range and switching function
• Quantity and delivery location

Diagnostics, replacement and spares for the TMT36

The TMT36 reports sensor and device faults over IO-Link as event messages, so the PLC can show a wire break, a short circuit or an out-of-range reading with the channel name. When a unit is replaced, a master with data storage can write the old parameter set into the new device automatically, which keeps the change-over to a few minutes and does not need a laptop on site.

For spares keep the same sensor type, wiring and IO-Link revision. Remember that the transmitter has no galvanic isolation, so ground loops between the sensor sheath and the machine frame can affect the reading; connect the insert as the manufacturer describes and avoid earthing the sensor on both sides. Check the push-in terminals after vibration on engines or compressors.

Mounting notes for the TMT36 in hot sites

In hot climates the ambient temperature inside a terminal head in direct sun can exceed the air temperature by a wide margin, so use a sunshade or a head with a neck extension on hot lines and respect the −40 to +85 °C range of the electronics.

Documents and quotation

A copy of the manufacturer technical information for the TMT36 is attached on this page so you can check ranges, connections and ordering codes against your specification.

Send the full order code or the process data (fluid, temperature, pressure, line size or tank data, output and approvals) and Seven Star LLC will prepare a quotation and confirm lead time. We are an independent supplier in Muscat and do not represent the manufacturer.