The BA369 is an
intrinsically safe, battery powered, panel mounting digital clock that will
accurately display local time in a hazardous area. The clock incorporates a
temperature compensated crystal oscillator that ensures less than one minute
error per year at ambient temperatures between 0 and 40°C. For most industrial
applications this accuracy is adequate, but if greater precision is required, or
the display must be traceable, the BA369 may be synchronised with an external
The 25mm high
wide-angle display is easy to read and allows installation of the clock in
almost any panel or cubicle.
Hours and minutes are
continuously displayed separated by a flashing colon to show that the clock is
functioning correctly. Operating a front panel push-button will change the
display to seconds or to the date. When the button is released the original
display will return.
ATEX intrinsic safety
certification permits permanent installation in Zones 0, 1 or 2. When used as a
stand-alone clock no wiring is required. The clock is powered by an internal
BA491 intrinsically safe battery that may be replaced within the hazardous
adjustment are performed via the front panel pushbuttons which, to prevent
unauthorised adjustment, may be protected by a user selectable four digit
security code. All settings and adjustable parameters are contained in a simple,
easy to use menu. In addition to entering the local time and date, this menu
allows a twelve or twenty four hour format and automatic daylight saving to be
selected. If used, the type of synchronisation can also be defined.
synchronisations are selectable from within the programme menu. Connecting
synchronising terminals 1 and 2 together will stop the clock at the current
displayed time. When the terminals are disconnected the clock will restart from
the nearest minute, the nearest hour or from a preset time entered via the
programme menu. The two synchronising terminals have intrinsic safety output
parameters that allow up to ten clocks to be connected in parallel. All the
clocks may be synchronised by a single hazardous area switch, or connected to a
common Zener barrier or galvanic isolator and synchronised from the safe area.
Elapsed time may also
be displayed by the BA369 clock when the synchronising preset time is set to
00:00. Disconnecting the two synchronising terminals will reset the display to
00:00 and start the clock running. When the terminals are reconnected the clock
will stop and display the elapsed time.
The front panel of the
BA369 has IP65 protection and a neoprene gasket seals the joint between the
clock and the panel making it suitable for use in areas that will be hosed.