BEKA BA377NE, Manual

Page: 14 / 47

14
5. ACCESSORIES
5.1 Display backlight
The BA377NE 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 field wiring
is required, but the supply current increases as
shown below.
BA377NE
current
consumption
Without backlight 10mA
Additional for backlight 22mA
Addition with terminals 3 & 4 linked 6mA
---------------
Total current 38mA 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 BA377NE 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 4.5 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 BA377NE 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.
Note:
The BA495 rear cover sealing kit provides additional
rear impact and ingress protection but it is not Ex nA
certified.
Therefore the BA377NE Timer or Clock
must still be mounted within an Ex nA, Ex e or Ex p
enclosure as described in section 4 of this manual to
comply with Ex nA certification requirements.