C-91
1
The typical usage rate for 1 year in hours can be estimated as a median usage
of 5420 hrs (t): between a minimum 8 hrs/day, 5 days/wk, 52 wks/yr or 2080
hrs and a maximum 24 hrs/day, 365 days/yr or 8760 hrs.
2
Using the basic reliability formula:
R = exp -t/MTBF
0.989 = exp (-5420/MTBF)
ln (0.989) = 5420/MTBF
MTBF = 5420/-0.011061
MTBF = 490,012 hrs
Sealing
Dust Seal
If a dirt and dust seal is all that is necessary for your application, you may easily
apply open cell foam material, similar to that used between the touchscreen and
the display, between the touchscreen and bezel. If the seal contacts the active
area of the touchscreen, avoid compression of the seal sufficient to cause
continuous touch between the touchscreen coversheet and glass. This can be
monitored during installation by connecting an ohmmeter between pin 1 and 3
of the touchscreen cable.
Watertight Seal
Watertight seals are achievable by applying gasket around the inactive boarder
region of the touchscreen. Caulks and elastomer gaskets of almost any type may
be used to make a seal between the touchscreen and bezel in this region. Caulks
can be used over the active area of the touchscreen as long as force on the bezel
is not transferred to the touchscreen. Gaskets must be applied in the inactive
boarder region of the touchscreen to prevent unwanted touches caused by the
gasket pressing on the active touch area. These types of seals can meet NEMA 4
and 12, and IP 65 standards.
Open-cell or closed-cell foam gaskets manufactured from sulfur vulcanized
elastomers are not recommended. In some very unique situations associated
with high heat and humidity, the sulfur can migrate from these gaskets and
attack the silver electrode pattern of the touchscreen. Examples of sulfur
vulcanized elastomers include Neoprene or Polychloroprene (CR), Ethylene
propylene rubber (EPDM), Styrene-Butadiene Rubber (SBR), Nitrile rubber
(NBR) and Natural rubber (NR). These elastomers can also be crosslinked
without the use of sulfur.
Summary of Contents for AccuTouch 821615-000
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Page 15: ...1 16 E l o E n t u i t i v e T o u c h m o n i t o r...
Page 55: ...4 60 E l o E n t u i t i v e T o u c h m o n i t o r...
Page 75: ...A 80 I n t e l l i T o u c h S e c u r e T o u c h G u i d e...
Page 78: ...B 83 2210 Serial Controller Figure B 2 E271 2210 Serial Controller...
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