Yokogawa RAKD - Manual (Page 10)

<1. INTRODUCTION>
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IM 01R01B30-00E-E 5th edition January 01, 2013 -00 All Rights Reserved. Copyright © 2003, Rota Yokogawa
1.2 General description
This manual describes installation, operation and maintenance of the RAKD. Please read it carefully before
using this device.
Further, please note that customer features are not described in this manual. When modifying specifications,
construction or parts, this manual is not necessarily revised unless it can be assumed that these changes will
impair RAKD functions or performance.
All units are thoroughly tested before shipping. Please check the received units visually to ensure that they
have not been damaged during transport. In case of defects or questions please contact your nearest
YOKOGAWA service centre or sales office. Please describe any defect precisely and indicate model code as
well as com. no. number.
YOKOGAWA refuses any liability for units which have been repaired by the user without prior consent and do
not meet the specifications as a consequence..
1.3 Principle of measurement
The RAKD is a Variable Area Flow Meter for volume and mass measurements of gases and liquids.
A float, whose movement is nearly independent of viscosity is guided concentrically in a specially shaped cone.
The position of the float is transferred magnetically to the indicator, which shows the measurement values by a
pointer on a scale. The indicator can be equipped with limit switches and an electronic transmitter.
Fig. 1.1
All units are calibrated with water or air by the manufacturer. By adjusting the calibration values to the measured
substance’s state of aggregation (density, viscosity), the flow rate scale for each measuring tube can be
determined.
F10.EPS