The Worlds Smallest Infrared Thermocouple!
The world's smallest IRt/c's are self powered, with K t/c output. Optics available are 1:2 (all temperature ranges available) and 4:1 (only calibrated for K-440F/220C). For those special applications where mounting is impossible with standard sized sensors, the micro IRt/c can go places no other IR sensors have gone before, with the same high performance as all of the IRt/c products. There are four models to choose from:
CONNECTING TO CONVENTIONAL THERMOCOUPLE INPUT DEVICES
Micro IRt/c's have a higher impedance (15 - 40 Kohms) than our standard IRt/c's, when connecting the Micro IRt/c to conventional thermocouple input devices we recommend using input devices with less than 1 nanoamps of leakage current to minimize offset errors. To check if your input device is suitable for use with the Micro IRt/c simply add a 60 Kohm resistor across the + and - of the T/C input terminals of your input device. If the device reads close to the correct ambient temperature, it's good to go. If it reads higher than the correct ambient try to correct for it via an OFFSET. If you can, then it's OK for use. If you can't then the device is not compatible. If it reads open circuit or sensor break, then the device can not be used. The linear ranges test report below illustrates the 2% or +/- 2.2 °C accuracy range for each Micro IRt/c temperature range model when connected to a conventional T/C input device.
Micro IRt/c Linear Test Report
CONNECTING TO PROGRAMMABLE THERMOCOUPLE INPUT DEVICES
For programmable input device users, the linear range can be increased, and the mV output tables below can be used. The published tables are only good for ambient temperatures close to 25C, if the ambient temperatures change, the accuracy will maintain at temperatures close to the calibration point. Outside that range the accuracy will not hold, and custom tables can be generated for varying ambient temperatures upon request (firstname.lastname@example.org for more info).
Micro IRt/c mV Output Tables
FOR OEM'S AND DESIGNERS:
Since the Micro IRt/c has high impedance, schematics are available to transform the impedance from high to low.
Micro IRt/c Schematic Drawings
Air purge jacket (APJ-1) for cleaning and cooling to 347 F (175 C), and inexpensive mounting accessories for micro IRt/c and APJ-1.
Micro IRt/c Air Purge Jacket (APJ-1)
APJ-1 Air Purge Jacket assembly drawing with recommended fittings and tubings
GROUNDING AND SHIELDING FOR ELECTROSTATIC PROTETCTION AND NOISE SUPPRESSION
For all micro IRt/c's with shielded cable