Schematics

Schematics

The IRt/c is calibrated to match a conventional thermocouple (t/c) at a specific temperature. There are two differences: IRt/c’s have a higher impedance than regular t/c’s, and they generate a non-linear output signal, as opposed to a linear t/c signal.

The IRt/c mV signal output matches a t/c at it's calibration point, and is 2% linear at temperatures close to that point. When the non-contact, self powered IRt/c is wired into a conventional t/c input device the target temperature displayed will be the same as the surface temperature the conventional t/c is displaying.

With programmable controllers, microprocessors, PLC, or computer interface, the error can be reduced to a small values even over a very wide temperature range (See Accuracy Table).

For the Micro IRt/c with an impedance range of 15 - 40 kohms, we recommend using input devices with less than 1 nanoamps of leakage current to minimize offset errors.

For OEM copanies it can be preferable to design custom specific readout electronics. The high impedance of the Micro IRt/c needs to be taken into account when designing readout electronics. In the schematics file a low cost method is presented for an OEM to design readout electronics to accurately acquire temperature measurements using the Micro IRt/c.

Instructions for schematic design