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Reinventing the calibration process

What if you could eliminate product quality risk due to inaccurate process temperature measurement between calibration cycles?

ifm’s “Calibration Check” technology provides real-time continuous monitoring of instrument accuracy and measurement uncertainty. A large, bright LED dome provides an immediate signal of any deviation from the user-specified tolerance.

What if your temperature instrument could reduce your total cost of ownership?

Initial purchase price of an instrument is generally only a small percentage of the total cost of ownership equation.

ifm’s “Calibration Check” technology automates manual periodic calibration checks. By eliminating mistakes from manual measurements and hand-recorded values, you ensure accurate time-stamped quality records.

Typical periodic calibration verification cycle

  1. Install: It is necessary to install two identical units next to each other. Typically, both units are affected by drift in the same way.
  2. Remove: Periodically, remove a unit from service. Frequency depends on each user’s quality process.
  3. Check: Check the calibration of the unit against a known standard. This is done in-house by the user or by third party labs.
  4. Validate manually: Validate the results.
  5. Document manually: Document the results.
  6. Reinstall: Reinstall the unit.

Automated continuous calibration verification with IO-Link

  1. Install: A single TCC takes the place of two standard transmitters.
  2. Measurement: Measured process value sent to PLC via IO-Link for process control.
  3. Document automatically: Via IoT port, record time-stamped PT and NTC measured values.
  4. Check automatically: Automatically check documented values for drift.
  5. Continue: This verification cycle continues without the need to remove the TCC from service.

At-a-glance indication of sensor health

In addition to automating the calibration process, the "Calibration check technology" of the TCC provides real-time monitoring of instrument accuracy. The TCC signals deviation from a user-specified tolerance electronically as well as visually when the LED changes color.

  • Monitors measurement uncertainty 24/7 between calibration intervals.
  • Minimizes product loss / quality impact as a result of inaccurate measurment between calibration intervals.
  • Eliminates errors caused by manual measurement or manual data storage with automatic data logging.
  • Potentially reduces the number of formal calibration verification checks.

LED color provides immediate visual feedback 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.

  • Specified calibration check limit exceeded
  • Reference element (NTC) defective
  • Calibration check function not available
  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.