HID Lumidigm M Series, Mechanical Integration Manual

Page: 22 / 28

Lumidigm M-Series M3xx Modules Mechanical Integration Guide, PLT-02217, Rev. A.0
December 2014 Page 22 of 28
4.3.2 M3xx Specifications
Operating temperature internal 0C to 60°C
Operating humidity internal 0 to 95% RH non condensing
Maximum background light intensity 18Klux
Platen seal rating IP65
Unit seal rating None - open to environment
Electronics conformal coating None
In this example, the M3xx and other electronic and display components within the
enclosure do not have sufficient operating ranges to meet the external operating
requirements without the aid of the enclosure. Thus, the enclosure must provide controls to
insure that the maximum operating characteristics of each of the enclosure contents is not
exceeded.
Properly designed into an outdoor enclosure, an M3xx provides a best-in-class biometric
performance solution for outdoor environments.
Comparing the M3xx specifications to the enclosure external requirements there are four
control areas the enclosure must provide:
Operating temperature - the enclosure must provide heating and cooling to insure that its
contents are > 0°C and < 60°C when operating.
Water and dust sealing - the enclosure must prevent water and dust ingress at all sealing
surfaces. Examples include keypads, displays, cables, and the M3xx platen area.
Background light -the combination of the enclosure design and the placement of the
enclosure in the environment must prevent exposing the platen to direct sunlight. The
M3xx can tolerate direct lighting up to 18Klux
Condensation -the enclosure must prevent condensation and insure that the relative
humidity (RH) over temperature is maintained within M3xx operating specifications.
4.4 Operating Temperature Control Considerations
Outdoor temperatures vary both seasonally and by time of day. Under normal conditions,
the rate of change of the external temperature is slow while overall daytime/nighttime
variation can be significant. Rain or other forms of precipitation can change the
temperature of the enclosure much more rapidly.
The user will interact with enclosure control surfaces including the sensor platen. The range
of comfort is roughly 5°C to 40°C and this range is much more restrictive than the
operating range of the M3xx itself.
Solar heat gain can be significant on exposed surfaces in the summer months re15
to +20°C over the ambient temperature in some places. To maintain no more than 40°C on
the platen with a solar gain of +15°C means the ambient temperature cannot be greater
than 25°C (77°F) which represents an unrealistic operating restriction for an outdoor
enclosure. Active cooling of the surfaces is not practical, so the only viable strategy is to
place the enclosure in the shade or for the enclosure itself to provide shade to the control
surfaces.