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General
Description
These meters are
mainly used for controlling the running time of machines,
apparatus and instruments as well as for recording maintenance
time, warranty time or rental use time.
A synchronous
motor operating through a gear train drives the number-wheels
for the display of full hours, 1/10 h and 1/100 h. On
AC-versions the mains supply (50 or 60 Hz) is used as
frequency standard. On DC-versions the exact frequency is
generated by means of a quartz. A rugged and completely
insulated plastic housing provides substantial protection
against environmental influences.
Model H 57 is
suitable for flush mounting. 48 x 48 mm. Slip-on bezels 55 x
55 mm and 72 x 72 mm are also available. It's seated height is
only 28 mm. |
