DEIF XL / BW / BRW-2 Illuminated indicators
Introduction
This document gives guidelines for mounting, connecting and commissioning the XL or BW/BRW-2
instruments. XL and BW/BRW-2 instruments are different from the well-known instruments based on a
moving
coil system. The XL and BW/BRW-2 instruments are based on a so-called x-coil system with a rotating
magnet placed in the centre of two coils surrounding the magnet. The combination of a microcontroller
and the
cross coil system forms a unique instrument with a very high linearity. The major difference, compared
with the
traditional instruments based on a moving coil system, is that the XL and BW/BRW-2 instruments must be
connected to a 24 Vdc supply. This supply is power for the built-in electronics. Because the XL and
BW/BRW-2
instruments are based on a microcontroller, it is now possible also to use data communication as input
instead of traditional analogue current or voltage signals.