BEKA BA377E, Manual

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17
5. ACCESSORIES
5.1 Display backlight
The BA377E Timer and Clock can be supplied with a
factory fitted backlight that produce green
illumination enhancing display contrast and enabling
it to be read at night or in poor lighting conditions.
The backlight is internally powered from the
instrument power supply so no additional wiring or
intrinsically safe interface is required, but the supply
current increases as shown below.
BA377E Timer
current
consumption
Without backlight 10mA
Additional for backlight 22mA
Addition with terminals 3 & 4 linked 6mA
---------------
Total current 38mA max
BA377E Clock
current
consumption
Without backlight 10mA
Additional for backlight 22mA
---------------
Total current 32mA max
5.2 Control outputs
Although the dual isolated control outputs are factory
fitted options, they are described in the main body of
this instruction manual as they will be used for the
majority of applications. If control outputs are
required they should be specified when the
instrument is ordered.
5.3 Scale card
The BA377E has a window on the right hand side of
the display through which a scale card showing the
units of measurement such as hours can be seen.
New instruments are fitted with a scale card showing
the units of measurement specified when the
instrument was ordered, if the units are not specified
a blank scale card will be fitted. A pack of scale
cards pre-printed with common units of
measurement is available as an accessory. These
can easily be fitted on-site without opening the
instrument enclosure or removing it from the panel.
See section 4.4 of this instruction manual.
Custom scale cards for applications requiring less
common units of measurement are also available.
5.4 Tag information
New instruments can be supplied with a tag number
or application information printed onto the rear panel
adjacent to the terminals. This information is not
visible from the front of the instrument after
installation.
5.5 Rear cover sealing kit
The BA377E Timer or Clock’s rear of panel ingress
protection can be increased from IP20 to IP66 with a
BA495 rear cover sealing kit. Manufactured from 316
stainless steel the cover incorporates two M20
unthreaded entries for cable glands. It allows the
BA377E Timer or Clock to be installed in an open
panel, or to provide additional rear protection when
installed within an enclosure.