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.