UVP UVGD-68 Mineralight - Manual (Page 2)

Ultraviolet Light
Ultraviolet energy cannot be detected by the human eye. Only a blue-hued light
will be visible through the filter of the lamp. This is due to the emission of visible
light from the lamp grid. The integrated filter eliminates most of this visible light
interference and also reduces solarization for prolonged filter life.
Shortwave (254nm) is the ultraviolet energy farthest from visible light, shorter than
rays in sunlight, and is primarily noted for its ability to fluoresce minerals for
chemical analysis. It is also noted for its germicidal effects.
Using the Ultraviolet Lamp
The UVGD-68 is supplied with an 8-foot primary power cord which must be
plugged into a wall power supply. The lamp is turned on and off with a single
toggle switch and reaches its peak intensity after a five minute warm up period.
Filter Assembly Replacement
Since shortwave filters deteriorate over time due to solarization, periodic
replacement is required. Depending on the application, a useful life of 500 to
1,000 hours can be expected. Since the filter is permanently attached to the
frame, the filter must be replaced as a filter/frame assembly. To replace the filter,
unplug the lamp from its power source. Remove the four screws on the side of the
faceplate. Carefully lift off the old filter/frame assembly. Place the new assembly
into position on the lamp housing and replace the four screws.
Not all fluorescent samples have the same brightness response to UV. Brighter
specimens will often respond for over 1,000 hours if within a reasonably close
range. However, if specimens with a lower level of fluorescent response are used,
either move the specimen closer to the lamp or replace the filter.
Grid Replacement
The UVGD-68 lamps have a grid life of approximately 20,000 hours. The lamp’s
unique grid can be continuously used on a flasher without any effect on grid life.
To replace the grid, unplug the lamp from its power source. Remove the
filter/frame assembly (see “Filter Assembly Replacement” above). Follow the lead
wires from the end of the grid to the terminal strip attached to the bottom of the
lamp housing. Loosen the two screws that hold the wires coming from the grid to
the terminal strips, and remove the two wires. The grid and reflector are a single
unit and will easily lift out. Replacement is the opposite of removal. Note that the
grid and reflector must be replaced as a single unit.
The old grid/reflector assembly contains mercury and must be disposed of
according to governing regulations. The assembly may be sent to UVP
headquarters for proper disposal.
Mounting Instructions
The UVGD-68 lamp comes with wall mounting brackets. To mount the bracket,
remove the screws that hold the pivoting portion of the bracket together. Once
disassembled, bolt or screw the unattached bracket piece to the desired location,
horizontally or vertically. After the bracket is secured, lift the lamp into position and
reattach the two pivot screws. Note that the screw must pass through the open
hole into the threaded hole on the bracket. To adjust the beaming angle, loosen
the screws, pivot the lamp to the desired angle, and then tighten the screws.
Using Flashers
The use of a flasher will greatly help in maximizing the life of the shortwave filter. If
the lamp is being used in a mineral display, the flasher can provide a dramatic
effect of showing drab-looking minerals under ordinary light and transforming
these specimens to their glowing fluorescence under ultraviolet light. Simple
manual flashers can be purchased at electrical supply houses. Lamps can be
continuously used with a flasher without any effect on lamp life.
Replacement Parts & Accessories
Model Grid Part No. Filter/Frame Part No.
UVGD-68 Lamp 77-0001-04 38-0006-04
Part Description Part No.
UV Goggles 98-0002-02
UV Spectacles 98-0002-01
UV Faceshield 98-0002-04
UV Intensity meters Contact UVP
Blak-Ray® Safety Goggles and Contrast Control Spectacles
Special formula lenses completely eliminate "blue haze" interference while
protecting eyes from harmful bands of UV. UV Goggles (part number 98-0002-02)
provide maximum safety from extended or high intensity UV light sources. UV
Spectacles (98-0002-01) are used for sporadic lower intensity UV light sources
and can be worn comfortably over prescription glasses. The UV Faceshield (part
number 98-0002-04) provides similar UV protection for the entire face.
Ultraviolet Intensity Meters
For the widest energy range measurements, high accuracy and interchangeable
sensors for measurements at 365nm, 302nm and 254nm, the UVX Digital
Radiometer can be used. Units are handheld, battery operated and have compact
sensors with 3-foot electrically shielded cords. Also available are Blak-Ray Meters
in models J-221 for the measurement of longwave (365nm) UV, or J-225 for the
measurement of shortwave (254nm) UV. The meters are compact and highly
accurate.