The Model T400 is a low cost, single sided
vacuum frame exposure unit, which is enclosed within its own cabinet.
Exposures are controlled by a light integrator system, which accurately
measures the amount of UV energy reaching the vacuum frame ensuring repeatable
exposures throughout the life of the lamp and in spite of any voltage
fluctuations. The UV output of the specially designed lamp supplied as
standard has a major peak of energy at 365nm which closely matches the
majority of dry film and liquid resists currently available. A 420nm lamp
is also available for specialty materials and diazo film.
As standard, the Model T400 has a glass frame which includes a specially
designed, hard wearing, moulded vacuum seal. As an option, a patterned
polyester sheet can be provided in place of the glass in the vacuum frame.
The Model T400 incorporates a semiautomatic exposure sequence. Once the
work has been placed in the frame and the frame is closed the vacuum button
is pressed. This starts the vacuum pump and initiates an operator set
delay. When the light seal door is closed the exposure will start once
the delay has finished. At the end of exposure andwhen the door opened,
the vacuum is automatically released, allowing easy access to the work.
A yellow safety lamp is incorporated and can be switched on or off.
An Eight memory computer controls all the functions of the exposure unit,
such as exposure values, light levels and delays etc.