Isotech 976 Data sheet

Gemini R Medium-Temp. Blackbody Source

550°C

to

30°C

Model 976

The Gemini R comprises a blackbody with which medium temperature infrared thermometers can be calibrated.

The temperature of the cavity can be set to ±0.1°C over the temperature range 30°C to 550°C.

The temperature of the furnace is set on a controller, while an independent indicator, whose sensor fits into the cavity,
indicates the actual radiance temperature. The sensor can be removed from the Blackbody and placed in a drywell or
liquid bath for a complete system calibration.

The variation seen on the controller’s temperature indication over a 5 minute period is less than ±0.2°C. Similar variations
can be detected by a radiation thermometer looking into the cavity.

Using a portable radiation thermometer having a target diameter of 13mm, the 65mm target was surveyed, radially.
Maximum temperature differences of ±1°C were found for set temperatures in the range 100°C to 500°C.

Temperatures along the inner 100mm of the 160mm long cavity were measured at 400°C and 500°C, using a hand held
fibre-optic radiation probe. Maximum temperature differences of ±4°C were found.

The temperature, as shown on the controller, agrees with the cavity temperature as measured by a radiation thermometer,
where calibration is traceable to National Standards, to within ±2°C.

Traceability may be established with a NIST certificate for the built-in indicator and supplied probe.

Now Includes

PC Interface and Cal NotePad

Windows Software

Key Features

• Medium-Temperature Blackbody Source

• 65mm Cavity Diameter

SPECIFICATIONS

Model 976

Temperature Range 30°C to 550°C

Accuracy ±2°C

Emissivity Greater than 0.995

Stability ±0.2°C

Display Resolution

Cavity Size 65mm diameter

Time to Temperature 45 minutes

Power

Dimensions 310mm x 265mm x 200mm (HxWxD)

INFRARED

Weight

0.01°C to 99.99; 0.1°C
from 100.0 to 550.0

160mm deep

1000 Watts typical
110 VAC ±10%

22 lbs. (10kg)

• 0.995 Emissivity

• Portable

• Accepts Fixed-Point Cells

NEW!

Gemini R 700. Also available is a

model with a maximum operating

temperature of 700ºC

— Ask for Details

ACCESSORIES

431-03-00 Gallium Hockey-Puck Cell

976-05-00A Indium Hockey-Puck Cell

976-05-00B Tin Hockey-Puck Cell

976-05-00C Zinc Hockey-Puck Cell

935-14-72 Replacement Probe

931-22-27 Carrying Case

976-01-05 Set of 5 orifice plates to restrict cavity

HOW TO ORDER

976 Gemini R Black Body Source

100/infrared calibrators

aperture diameter to 50mm, 40mm,
30mm, 20mm or 10mm.