Medium Temperature Blackbody Source, 30°C to 550 °C E >0.995 Cavity 45 x 285mm

• 30°C to 550 °C
• Emissivity > 0.995 Cavity 45 x 285mm
• Controller Resolution 0.1°C

The Medusa R comprises a blackbody with which radiation pyrometers can be calibrated.

The temperature of the cavity can be set to ±0.1ºC over the temperature range 30ºC to 550ºC. The controller reaches 550ºC 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 was ±0.2ºC. Similar variations were 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 ±1ºC were found for set temperatures in the range 100ºC to 500ºC.

Temperatures along the inner 200mm of the 285 mm long cavity were measured at 400ºC and 500ºC, using a hand held fibre-optic radiation probe. Maximum temperature differences of ±4ºC 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 ±2ºC.

Slim Fixed Point Cells can be fitted to the Medusa R giving small uncertainties suitable for National Standards.

Traceability may be established with a UKAS certificate for the in-built indicator and supplied probe (935-14-95).