Preva Dental X-ray System User Manual, 00-02-1576, Revision ZA1
7
4
See
About the 20 cm and 30 cm Cones
on page 19 for ordering information.
Limiting Device
[BLD]
The Cone establishes the distance from the X-ray tube to the patient’s
skin. It provides positioning assistance and collimates the X-ray beam to
within a defined circle at its end. The Preva is shipped with the standard
20 cm (8-inch) Cone attached to the Tubehead. An optional 30 cm (12-
4
Exposures can be made with the exposure button or with the optional
Handswitch (30-A2040).
The Tubehead contains the X-ray tube, high voltage circuit, and a round
Cone. The tubehead is shipped assembled to the Articulated Arm.
Do not block the small hole in the plastic handle that
covers the back of the tubehead. It provides an air vent
to allow the tubehead oil to expand and contract as the
Configurations
The Preva is available as either a wall-mounted or a mobile unit. See the
Preva Installation and Service Manual (PN 00-02-1577) mounting
Service
Allow only Midmark-approved personnel to install or service Preva
equipment. Contact Midmark for assistance in locating an approved
dealer. Contact information is on the back cover.
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