Gemini R 976 Blackbody Calibrator radiation source.
Calibration of Radiation Pyrometers: 50ºC to 550ºC
The Gemini R is a blackbody calibrator source with which radiation pyrometers, commonly referred to as IR sensors, can be calibrated. With a temperature range of 50ºC to 550ºC, the temperature of the cavity can be set with 0.1ºC resolution. 
The temperature of the furnace is set and indicated on a PID controller. 
An independent indicator is also provided for higher accuracy with a standard probe, which indicates the actual radiance temperature. 
Temperature variation over a 5-minute period, as viewed on the temperature controller, is ±0.2ºC and a radiation thermometer directed into the cavity detects similar variations.

• Medium-Temperature Blackbody Source

• 65mm Cavity Diameter

• 0.995 Emissivity

• Portable

• Accepts Fixed-Point Cells

The Gemini R’s cavity’s size is 2.5” Ø x 6.3” deep (65mm x 160mm). 
Maximum temperature differences are ±1ºC in the range of 100ºC to 500ºC. 
The Gemini R is capable of accepting blackbody fixed points to achieve the highest level of a radiation measurement possible. 
Typical fixed-point uncertainties are ±0.25ºC. Gallium, indium, tin and zinc cells are available.

Emissivity is greater than 0.995, and traceability may be established with a NIST certificate
for the built-in indicator and/or supplied probe. 
The Gemini R can be supplied with RS232 or RS422 communications.