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Gemini R 976 Blackbody Calibrator.

Gemini R 976 Blackbody Calibrator radiation source.
Calibration of Radiation Pyrometers: 50°C to 550°C

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 50°C to 550°C, the temperature of the cavity can be set with 0.1°C 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 ± 0.2°C and
a radiation thermometer directed into the cavity detects similar variations.

Blackbody Calibrator

Model  Description 
R 976  Gemini R 976 Blackbody Calibrator radiation source.
The Gemini R’s cavity’s size is 2.5” Ø x 6.3” deep (65mm x 160mm).
Maximum temperature differences are ±1°C in the range of 100°C to 500°C.
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 ±0.25°C. 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.
Blackbody Calibrator specification
Model  976
Temperature Range  30°C to 550°C 
Accuracy  ±2°C 
Emissivity  Greater than 0.995 
Stability   ± 0.2°C
Display Resolution  0.1°C to 999.9; 1°C from 1000 to 1090 
Cavity Size  65mm diameter, 160mm deep  
Time to Temperature  45 minutes 
Supply  110 VAC ± 10% (50/60Hz)  
Dimensions  310mm x 265mm x 200mm (HxWxD) 
Weight  22 lbs. (10kg) 
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