Our online catalog is being updated! Please contact us for current pricing. ClearView™ VHW Series Self-Cleaning Optical Window ClearView™ VHW Series Self-Cleaning Optical Window Applications Metal Organic Chemical Vapor Deposition(MOCVD) Molecular Beam Epitaxy(MBE) Chemical Beam Epitaxy(CBE) Pyrometry RHEED screen ports DRS-1000 temperature measurement The ClearView™ VHW Series windows are self-cleaning viewports for use in deposition environments. The windows consist of an in-vacuum heated quartz disk, thermally isolated behind a standard vacuum window. Material that would normally cloud or obscure the view through a vacuum window encounters the protective heated disk instead. The material will re-evaporate from the heated disk at a rate dependent upon its vapor pressure/temperature curve. The ClearView VHW Series offers two sizes of viewport. The VHW-150 has a viewing diameter of 1.37" and the VHW-250 offers a 2.37" viewing diameter. Models ClearView VHW Series Self-Cleaning Optical Viewport 1.37" Viewing Diameter 7056 glass vacuum viewport 1.37" diameter viewing area 2.75" O.D. mounting flange Thin profile allows maximum viewing area Fused silica heated element Continuous operation up to 550°C Forced air cooling of housing Suitable for UHV environments Includes variable-temperature power supply Also available for Quartz viewport (see Ordering Information) VHW-150-G shown with variable-temperature power supply ClearView VHW Series Self-Cleaning Optical Viewport 2.38" Viewing Diameter 7056 glass vacuum viewport 2.38" diameter viewing area 4.5" O.D. mounting flange Fused silica heated element Continuous operation at up to 350°C Water cooled Includes variable-temperature power supply Also available for Quartz viewport (see Ordering Information) VHW-250-G shown with custom 6.0" mounting flange Ordering Information ClearView VHW Series Self-Cleaning Optical Viewport Viewing Diameter Viewport Type Model No. Price 1.37" 7056 glass vacuum viewport VHW-150-G $3,350 Quartz viewport VHW-150-Q $3,635 2.38" 7056 glass vacuum viewport VHW-250-G $5,900 Quartz viewport VHW-250-Q $6,385 Options Option: Mounting Flanges Model Numbers: /B-4.5; /B-6; /B-10 Price: add $130 to $200 /B-4.5 Mounting Flange Viewport modified for mounting on a 4.5" diameter chamber flange Price $130. /B-6 Mounting Flange Viewport modified for mounting on a 6.0" diameter chamber flange Price $150. /B-10 Mounting Flange Viewport modified for mounting on a 10.0" diameter chamber flange Price $200. Option: Temperature Control for VHW Power Supply Model Number: /PID Price: add $1,095 Allows variable temperature setting control Closed loop temperature control Heated disc temperature display Actual temperature sensed by thermocouple placed at heated element Modifies VHW viewport and power supply Option: Rack Mount Adapter Model Number: /RMA Price: add $185 19" rack adapter for mounting up to three VHW power supplies