2010 Construction and Material Specifications - Ohio Department of ...

809
732.06
Furnish materials according to the Department’s Qualified Products List
(QPL).
C. Type D2. Furnish a single housing signal head with a lens in one piece or in
two sections, one for each message. Color and mask the lens to display in portland
orange the symbol of an upraised hand from the left compartment and the symbol
of a walking person in white from the right compartment. Furnish reflectors and
baffle that form two light compartments. Install a clear glass incandescent lamp in
each compartment. When a LED light source is specified, the upraised hand and
the walking person symbols may be integral in the same compartment.
D. Countdown.
1. Operation.
a. Display driver shall be designed to allow individual LED failures without
affecting other LEDs in the same display.
b. The countdown timer shall be of the “smart” type, which continuously
samples the timing intervals presented by the pedestrian signal load switch
driver(s) in order to “learn” the programmed timing being used by the controller.
c. During interval sampling time, the countdown timer numerical display shall
be blank.
d. Sampling time to determine interval settings shall take a maximum of two
complete signal cycles.
e. The unit shall be capable of displaying a countdown commencing at the onset
of the pedestrian clearance interval and reaching zero at the end of the pedestrian
clearance interval.
f. Any interruption of the flashing pedestrian clearance display, e.g.,
preemption, timing plan change, during a countdown display shall immediately
cause blanking of the countdown numerals. The countdown timer shall “re-learn”
the pedestrian clearance interval upon return to normal service after preemption or
immediately following a change in walk clearance time associated with a timing
plan change.
2. Type A2. The top section shall be identical to the 12 inch (300 mm) Type
D2 pedestrian signal. The bottom section shall consist of a countdown display in a
12 inch (300 mm) housing. The display numeral segments shall be comprised of
two rows of discrete LEDs.
3. Type D2. The left side of the signal section shall consist of an integral
hand/walking person display. The right side compartment shall contain the
countdown display. The display numeral segments shall be comprised of two rows
of discrete LEDs.
Furnish materials according to the Department’s Qualified Products List (QPL).
732.06 Pedestrian Pushbuttons. Furnish pushbuttons of sturdy construction
that consist of a base housing and a removable cover. Furnish components that
provide a pushbutton with normally open contacts and that include all electrical
and mechanical parts required for operation.