Direct access to the alarm setpoints is only avail-
able when the menu is enabled - see section 10.3.8
11. BACKLIGHT
The BA574C can be supplied with LED backlighting
to improve display contrast when the transmitter is
installed in a poorly illuminated area. The backlight
is segregated from the measuring circuit and may
be powered from any supply with an output
between 18 and 30V dc as shown in Fig 13.
If the BA574C is only used for indication, i.e. the
4/20mA output current is not used, the backlight
may be powered from the instrument power supply
by linking terminals 5 & 12 and 6 & 13.
Fig 13 Backlight power supply
26
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