M 350

The Model M350 blackbody source is specifically designed for direct and unambiguous calibration of heat flux meters up to 200KW/m2 or radiant flux density. A 60mm diameter opening allows the insertion of heat flux sensors deep into water cooled sight tubes to directly expose the sensor to 180° of radiance emitted from a spherical shaped cavity. For best results M350 is designed for vertical mounting, to minimize the air eddy currents within the cavity, and to insure a high degree of radiance uniformity. The large interior diameter of cavity of 300mm ensures that spectral radiance to the surface of sensor is near perfect approximation to Planck’s law. The large opening of water cooled sight tube can easily accept popular heat flux sensors manufactured by Schmidt-Boelter, Gordon or others. An independent water low meter with alarm and cutout system insures that the sight tube is adequately cooled before the insertion of heat flux sensors.

A fully digital high accuracy self tuned PID controller with adjustable set point holds the temperature within 0.25°C of set point assuring high stability and accuracy. The controller and all necessary safety components are enclosed in a 19” rack mount.

Specifications

Temperature Range	300.0° to 1100.0°C corresponding to radiant flux of up to 200KW/M2
†Accuracy	±0.25% of reading ±1°C
Temperature Resolution	0.1°C
Stability	0.25°C per 8 hour period
Heated Cavity Shape	Spherical 300mm (12”) diameter
Aperture Diameter for Insertion of Heat Flux Sensor	60mm (water cooled)
Emissivity (effective)	+0.995
Sensor	Precision Platinum Thermocouple
Method of Control	Digital Self-tuning PID Controller in 19” Rack Mount Enclosure
Communication Output	RS232C
Operating Temperature (Ambient)	0° to 44°C
Power Requirements	208 VAC ±5% 50/60Hz 4.0kw max. (230VAC optional)
Cooling	Enclosure: Fan Cooled, Sight Tube: Water Cooled
Dimensions	67cm H x 72cm W x 72 cm D
Weight (Source)	approx. 100kg (220 lbs.)
Weight (Controller)	approx. 20kg (44 lbs.)

Optional Features:

• RS422 or RS485 serial communication output

Optional Accessories:

• Sensor holder and spacer
• Stand 1.2 meters high for mounting M350

(no CE certificate)