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The Pegasus R is a compact furnace for calibrating radiation pyrometers.

The temperature of the furnace is set on a controller, whilst an independent indicator, whose sensor fits into the cavity, indicates the actual radiance temperature. The sensor can be removed for external calibration or the complete system can be calibrated.

The cavity diameter is 20mm, the depth 65mm. Emissivity is 0.995. The cavity is removable and a fixed point cell may be put in its place. The cavity inside the fixed point cell is 10mm in diameter by 65mm deep to the tip of a 120° cone.

Blackbody target radiation source for use with Pegasus R.

For calibration radiation thermometers in the wavelength range 0.9 to 14 micrometres. A blackbody radiation source ‘based on a design study by England’s National Physical Laboratory (NPL)’ for Isothermal Technology Ltd is housed, with suitable insulation, in the Pegasus tube furnace. The aperture is 20mm in diameter.

A Pegasus blackbody source has been calibrated at NPL (Nat. Physical Laboratory) with an uncertainty of ±2°C and the calibration was found to be reproducible after a period of about 2 months. A scan across the aperture at 444°C showed that the source was uniform to better than 0.3°C.

Traceability may be established with a UKAS certificate for the in-built indicator and supplied probe (935-14-115).


Technical FeatureValue
Temperature Range150°C to 1200°C
Display Resolution0.1°C to 999.9; 1°C from 1000 to 1200
Cavity Size20mm diameter 65mm deep
Heating Rate25°C/minute
PC InterfaceIncluded
Power800 Watts typical 100-130 or 208-240 Vac 50/60Hz
DimensionsHeight 310mm Width 265mm Depth 200mm
OptionsIndium BlackBody Cell – 970-06-00A Tin BlackBody Cell – 970-06-00B Zinc BlackBody Cell – 970-06-00C Aluminium BlackBody Cell – 970-06-00D Silver BlackBody Cell – 970-06-00E Probe 935-14-40 Carrying Case – 931-22-64 Gas Flow System – 984-00-00
How to orderModel 970 Pegasus R – Please state supply voltage required. Please state any special calibration requirements.


Pegasus R Model 970

150°C to 1200°C

The Pegasus R is a compact furnace for calibrating radiation pyrometers.

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