Yokogawa RAKD - Manual (Page 21)

<4. START OF OPERATION>
4-1
IM 01R01B30-00E-E 5th edition January 01, 2013 -00 All Rights Reserved. Copyright © 2003, Rota Yokogawa
4. Start of operation
4.1 Hints on flow rate measurement
The measured fluid should neither consist of a multi-phase mixture nor contain ferrite ingredients or large solid
mass particles.
The RAKD scale is adjusted to the state of operation/aggregation of the measured fluid by the manufacturer. If
the state of operation changes, it might become necessary to establish a new scale.
This depends on several factors:
- If the RAKD is operated in the given viscosity independent range, only the density of the float as well as the
operational density of the previous and new substance have to be considered. In case the operational
density only changes marginally (≤ 0.5%), the present scale can be used.
- If the RAMC is operated outside the given viscosity independent range, the viscosities at the previous and
new state of operation as well as the mass and diameter of the float have to be taken into account.
To establish a new scale, please refer to the folder “Anweisung zur Skalenumrechnung” (Instructions for
Scale Conversion) as well as the conversion table or order a new scale.
4.2 Pulsation and pressure shock
Strong pressure impact or flow pulsations can impair measuring operation considerably and should be avoided
open valves slowly, raise operating pressure slowly).
4.3 Start of operation of electronic transmitter
Ensure that the device has been connected correctly according to section 3-2 and that the used power supply
meets the requirements indicated on the scale.
Switch on the power supply..
The RAMC is now ready for operation..
The transmitter is prepared and calibrated according to its model code as a 2 wire unit.