Measurement system
The design of the TCC family of instruments includes two sensing elements that self-detect and send a warning if any signal drift is occurring. The PTC (Positive Temperature Coefficient) element increases its resistance with increasing temperature. The NTC (Negative Temperature Coefficient) element decreases its resistance with increasing temperature.
Because the PTC and NTC react to temperature change in opposite directions, the microprocessor is able to measures the differential between the two elements and alert the user to a potential decrease in accuracy.
Tip construction
ifm uses a highly engineered construction thin film tip design and two RTD elements.
The TCC uses fully welded 316 stainless steel IP69K hermetically sealed construction. This construction eliminates the potential for ingress -- a major contributor to instrument drift.
Unlike traditional instruments with a head chamber and "hockey puck" transmitter that must be field wired and matched (calibrated), the one-piece contruction of the TCC is delivered fully calibrated.
Every TCC sensor comes with a traditional 4…20 mA analog output as well as the latest IO-Link digital communication technology. Leveraging digital communication improves measurement accuracy and reliability over analog since there are no signal losses.
Using IO-Link provides insight into the status of your process
Calibration check status
The large LED dome on the TCC provides at-a-glance indication of sensor health.
Green
Normal operation. Monitors calibration check and on-board diagnostics
Temperature (PT) | Reference temperature (NTC) | Calibration check status (OUT1) | Analog signal (OUT2) | |
---|---|---|---|---|
Calibration check | On | |||
On-board diagnostics | On |
Blue
Alert mode. Signals a warning.
Temperature (PT) | Reference temperature (NTC)* | Calibration check status (OUT1) | Analog signal (OUT2) | |
---|---|---|---|---|
Calibration check | Off |
* In case of a defective reference element, the NTC temperature value will not be provided.
Red
Error mode. On-board diagnostics error signaled.
Temperature (PT) | Reference temperature (NTC) | Calibration check status (OUT1) | Analog signal (OUT2) | |
---|---|---|---|---|
Calibration check | ** | Off | 21.5 mA or 3.5 mA |
** The NTC temperature value is provided but only over IO-Link.