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TA2 temperature transmitters

The one-piece design of the TA2 and TD families eliminates ingress.

Technology overview

Metallic bonded tip

This ifm design uses a revolutionary process that metallically bonds the RTD element directly onto the copper-plated inner wall of the probe tip. This creates very low thermal mass with a direct metallic bond for optimal heat transfer. The metallic bond technology eliminates all polymer parts allowing the sensor to be used at higher temperatures. Additionally the tip construction offers response speeds twice as fast as our already fast thin film design.

The metallic bonded construction is great for:

  • UHT (Ultra High Temperature) pasteurization processes
  • HTST (High Temperature Short Time) pasteurization processes
  • SIP (Steam-in-Place) measurement
  • Continuous processes where fast reaction speed and critical temperature measurement is required

ifm's TA22xx sensors use this technology and they are rated to 200 ºC.

Thin film tip design

ifm uses a highly engineered construction method. The RTD element is first bonded to a thin film carrier. This reduces the thermal mass of the electrical leads. The film carrier and RTD element is then attached to a specialized assembly carrier. The carrier positions the RTD element into precisely the correct location and preloads the RTD with constant force against the probe’s inner sheath wall. This allows the RTD element direct and constant controlled contact to the sheath, minimizing the amount of thermal mass separating the RTD element from the process media. The result – fast and repeatable response!

Ordinary RTDs and temperature instruments have the sensing element potted into the tip of the sheath tube. The potting compound acts like an insulator, slowing the heat transfer to the RTD element. Typically, the RTD element location is not controlled, but simply lowered by its lead wires into the sheath and glued into place. Both of these factors lead to poor uniformity, repeatability and response time.

ifm's TA23xx and TA26xx sensors use this thin film tip design.

The image below shows the difference in response time from the thin film construction (TA23 / TA26 blue line) to the metallic bonded (TA22 orange line) construction.

Applications

Coolant temperature

Coolant is used to keep cutting tools from overheating and breaking, and causing machine downtime. What if you could reduce the time to implement and maintain your temperature instruments?

The TA transmitter’s one-piece factory calibrated design simplifies ordering, installation and commissioning by eliminating the common mistakes of multipart systems.

Process piping

Head temperature transmitters are commonly used for process temperature. But temperature drift often occurs with these head transmitter assemblies. What if you could eliminate the primary issues associated with temperature instrument drift?

The integrated RTD element and one-piece design eliminates ingress, a large contributor to instrument drift.

Unlock sensor potential with IO-Link

Via IO-Link, the TA2 family can provide:

  • Current temperature
  • Sensor diagnostics
  • Remote parameterization

FAQs

Q. How is response time for a temperature instrument specified?

A. “T05” and “T09” refer to the reaction time in seconds for the sensor to measure a change in temperature, typically 0…100 °C. T05 and T09 are the times the measurement take to reach 50% and 90% of the temperature change.

Response time as shown on our datasheets are for instruments directly inserted into the process. If thermowells are used, the response time will be much longer. Heat transfer paste can be used inside the thermowell to improve the response time.

Q. The TA sensors do not have pushbuttons. How do I change the measuring scale?

A. LR Device (QA0011) is ifm’s software to configure sensors. It can be used with a USB cable (E30390) connected to a laptop. Sensors can also be configured remotely using IO-Link.

Q. ifm’s temperature instruments use RTDs. What is the difference between an RTD and a thermocouple?

A. RTDs (Resistance Temperature Detector) change a very predictable amount of resistance for every degree change in temperature. ifm offers both Platinum (Pt) 100 and Platinum (Pt) 1000 RTDs. Pt100 devices change 0.385 ohms per °C and Pt1000 devices change 3.86 ohms per °C. RTDs are capable of measuring into the 600 – 700 °C range, and they provide an absolute measure of temperature. They are stable over a long period and are generally more accurate than thermocouples. RTDs use standard instrument cabling and do not need exotic alloy thermocouple wire. The overall total cost of ownership for RTDs is less than an installed thermocouple system.

A thermocouple consists of two dissimilar exotic metals joined together. The joined contact point produces a sensitive millivolt signal that varies as a function of temperature. Thermocouples are capable of high temperature measurement (1500+ °C), but only provide a relative temperature difference between the tip and leads. Thermocouple wire is required to connect them, and they can be sensitive to electromagnetic noise.