DT9102 B
3.2. Principle of operation
Area of application DT9102 B is an intrinsically safe digital clock which enables
accurate ti e to be displayed in even the ost hazardous
plant areas: Zone 1 and 2 or in safe areas.
Synchronising function allows the clock to be synchronised
with a aster clock. Connecting synchronising ter inals
together will stop the clock. When the ter inals are
disconnected the clock will re-start fro a new ti e
selected in the progra e enu. This ay be the nearest
inute or the nearest hour of the original display or a
preset ti e entered during progra ing.
The DT9102 B has two isolated digital outputs, which can
be used for alar signalling or for synchronising other
clocks.
The clock is powered by a replaceable intrinsically safe
battery pack.
DT9102 B is housed in a oulded polycarbonate case in
co pliance with IP65 for installation in the field or on a
control panel.
Operating principle The clock incorporates a high accuracy te perature
co pensated ti e base, which is processed by a
icrocontroller. The icrocontroller produces real ti e in
24 hour HH:MM for at, drives a large 4 digit 25.4
height LCD display, processes the front panel keypad and
the synchronising inputs, and drives the digital outputs.
The settings and the actual ti e are stored in a e ory
which stores its content for ini u 15 inutes for
bridging the battery exchange ti e. The settings can be
done by tree front panel buttons.
The device is operational for at least 15 inutes even if the
power supply is re oved.
Power suppl The device does not need external power.
Power supply is DT4V5BAT type battery pack.
The battery pack provides the energy for ini u two
years.
Attention! The DT9102 B is powered by only DT4V5BAT
type intrinsically safe replaceable battery pack
( anufactured by Datcon Kft.)!
Do not recharge!
The battery replace ent can be acco plishes even in a
hazardous area.
820180905-V120180905-V1
