Product Description

IR-2000 INTERNAL HEATER INSTRUCTIONS

This vacuum system bakeout unit was developed to replace or eliminate cumbersome ovens and heater tapes used in high vacuum system bakeouts. The heaters are small, high-power quartz lamps that operate inside the vacuum system. These heaters utilize 100% of the radiant heat emitted by the lamps and thus are able to reach bakeout temperatures in a much shorter period of time than ovens or tapes. The internal heat sources reduce the bakeout time required to reach base pressure. The heater elements are securely mounted on standard conflat flanges. Care should be exercised not to touch, damage, or coat the lamp because the high heating efficiency could be reduced.

The IR-2000 system INTERNAL HEATER employs 2 separately mounted quartz lamps designed for use inside a vacuum chamber to outgas the system. WARNING: When in operation for a long period of time, enough heat is generated inside the vacuum chamber that the chamber or feedthrough pins can cause painful burns if touched. Care must be exercised to prevent anyone from touching hot surfaces which can cause a burn and/or discomfort.

Setup Instructions:

• The IR-2000 INTERNAL HEATER is shipped ready for immediate use. However, the lamp itself is demounted and separately packaged to prevent damage in shipment.
• Carefully unwrap the quartz bulb. Do not touch the glass portion of the bulb when installing it in the holder, as a fingerprint on the glass portion may cause early bulb failure or diminished heating, not to mention unwanted outgassing.
• Carefully raise the upper bulb holder to insert the bulb and prevent the ceramic ends of the quartz bulb from damage.
• Install the bulb and holder in a 2-3/4″ OD x 1-1/2″ ID flange on the system. Be careful that it clears or does not interfere with any equipment inside the vacuum system. The bulb has a protrusion where it was sealed at the time of manufacture. Make sure this protrusion is not pointed toward the sheet metal reflector.
• Install the control unit in a rack panel or place it in an unobstructed place.
• Place the two power leads on the feedthroughs for the heater unit.
• The IR-2000 requires 12 amperes when both bulbs are in use.
• The IR-2000 INTERNAL HEATER unit is now ready to operate.
• With the vacuum pumping system in operation, turn the “Time” knob to the desired time for heating. The exact time will have to be determined for each system and depends on the outgassing required for system operation. The timer may be set for 1-12 hours depending on the system bakeout requirements. For periods of less than 2 hours, turn the timer past 2 and then back to the desired time.
• First, turn the power knob well past the intensity desired and then adjust the power for heating. Full power will decrease the time required to outgas the vacuum. As the system warms up and outgasses, the base pressure of the system will increase.
• After the timer shuts off, continue pumping for a period of time as the system cools. After cooling, the vacuum system is ready for use.
• Additional heating cycles may be needed to completely outgas the vacuum system and to reach the base pressure required, especially the first time the system is used. The quartz lamp is rated for 180 hours of service. McAllister Technical Services cannot guarantee the lifetime of the bulbs, as rough handling or severe system operating conditions may reduce the lamp service life.

Model Breakdown

Specifications:

• Power: 115 VAC, 60 Hz, 1200 W (Dual bulb)
• Dimensions: Heater unit mounting space – 1-1/2″ diameter x 4-1/2″ long
• Custom dimensions available – consult factory
• Rack Mount Controls: 3-1/2″ high x 19″ wide
• Materials: 304 Stainless steel flange, OFHC Copper rods, Quartz lamp glass (enclosed)
• Mounting Flange: Conflat 2-3/4″ OD

Temperature in 10^-8 Torr vacuum at full power:

• 3 minutes – 263ºC @ 6 inches – 222ºC @ 12 inches from heater unit
• 6 minutes – 273ºC @ 6 inches – 236ºC @ 12 inches from heater unit
• 9 minutes – 283ºC @ 6 inches – 242ºC @ 12 inches from heater unit