Isotech 999 Data sheet

infrared calibrators/101

Medusa R Primary Lab Blackbody Source

Model 999

The Medusa R comprises a blackbody with which radiation pyrometers 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 controller reaches 550°C approximately 45 minutes from switch on. Also, the cavity temperature, as measured by
a radiation thermometer took approximately 45 minutes to reach stability from switch on. The variation seen on the
controller’s temperature indication over a 5 minute period is less than ±0.5°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 45mm target was surveyed. Maximum
temperature differences of ±1°C were found for set temperatures in the range 100°C to 500°C. Temperatures along the
inner 200mm of the 285 mm 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. Large Fixed Point Cells can be fitted to the Medusa
R giving small uncertainties suitable for National Standards.

Fixed Point Cell

Insulation

Inconel Disc

Graphite Disc

90.00mm

114.00mm

10mm

42mm

550°C

to

30°C

Key Features

• Freeze and Melt Blackbody
FIxed-Point Cells

• Can be Used for Comparison
Calibration

• Accuracy to ±0.05°C

Now Includes

PC Interface and Cal NotePad

Windows Software

SPECIFICATIONS

Model 999

Temperature Range 30°C to 550°C

Emissivity greater than 0.995

Stability ±0.05°C

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

Cavity Size 45mm diameter

285mm deep

Time to Temperature 45 minutes

Power 110 VAC ±10% (50/60Hz)
1000 Watts typical

Dimensions 480mm x 425mm x 260mm (HxWxD)

Weight 37.5 lbs (17kg)

ACCESSORIES

998-06-00A Indium Large Blackbody

Fixed Point Cell

998-06-00B Tin Large Blackbody Fixed Point Cell

998-06-00C Zinc Large Blackbody Fixed Point Cell

984-00-00 Gas Flow System

INFRARED

HOW TO ORDER

999 Medusa R Black Body Source

infrared calibrators/101