Digital steering clocks ZCM-31 are intended
for realization of time functions in the systems
of automatics and steering. Switching on/
off the appliance is connected with sunrise
and sunset (dawn an dusk). The information
about geographic coordinates, the place
of the clock’s installation, current date and a
shift in relation to the universal time- all these
factors are used in order to calculate the time
of sunrise and sunset. The system calculates
the end of civil dusk, that is the phase,
during which the centre of the Sun’s face is
located on the 6 degrees angular below the
horizon- the Sun’s face is not noticeable but
sky is lit with dispersed sunlight. The system
additionally has a function of a programmed
night break and an ability of shifting the calculated
time of sunrise and sunset within a range
of +/- 120 min. The construction of a casing
makes it possible to install the system on a rail
TH 35 and possible sealing the appliance with
lead. The construction of the system guarantees
supporting of all the settings with
battery energy when the electric power
supply is off.