Yokogawa RAKD - Manual (Page 15)

<3. INSTALLATION>
3-1
IM 01R01B30-00E-E 5th edition January 01, 2013 -00 All Rights Reserved. Copyright © 2003, Rota Yokogawa
3. Installation
3.1 Installation in the pipeline
The pipe has to be so stabilized that vibrations on the pipe are avoided. Additional recommendations can be
found in guideline VDI/VDE 3513 sheet 3.
If pollution of the metering tube may appear a bypass-pipe is recommended, which permits the removal (see.
chapter 6 “maintenance”) of the Rotameter for cleaning without interruption of the flow.
Before installing the Rotameter, make sure there are no parts of packing or securing inside the Rotameter.
It has to be taken care at the connection of units with internal thread that no residues of the sealing compound
come into the tube (e.g. remains of the PTFE sealing compound).
To avoid stress in the connecting pipes, the connecting flanges must be aligned in parallel and axial direction.
Bolts and gaskets have to be selected according to the maximum operating pressure, the temperature range
and corrosion conditions. Centre gaskets and tighten nuts with a torque appropriate for the pressure range.
If contamination or soiling of the RAKD is to be expected, a bypass should be installed to allow the removal of
the instrument without interruption of the flow.
Please read also chapter 2.2. For further instructions on installation please refer to VDI/VDE3513.
In case of devices without valve but with process connection internal thread the float shaft of tubes with cone
44 and bigger sizes may move into the range of the threaded joint. Keep attention not to bend the guide bar
when screwing up the connection. The inner diameter of the connector must be at least 8 mm for cone sizes
44 - 51 resp. 10 mm for cone sizes 52 and 53.
To avoid float bouncing in case of gas applications, attend to VDI/VDE 3515 sheet 3.
For devices without valve use a throttle either in the inlet or outlet (to install at that side with the bigger volume).
For installation of several instruments in parallel tubes take care that the distance between the middle axis is
at least 120 mm to avoid magnetic influence. The distance to other ferritic material should not be less than
60 mm. Take care that the strength of external magnetic fields is approximately 0 mT.
3.2 Wiring
3.2.1 Connecting diagrams
Please regard the drawings of this chapter.
RAKD with electronic transmitter or with limit switches have one or two Quickon connectors at the rear.
In the connecting diagrams he lower one is named "S" and the upper one "T".
Not used connector positions are closed with a blind plug.
The following table shows the connections for the respective equipment configuration.
The load resistance of metering or indicating instruments, which are connected serial to the current output, may
not exceed (U- 13.5 V) / 20 mA .
Type T
without contact
Type T
with MIN contact
/K1 or /K6
Type T
with MAX contact
/K2 or /K7
Type T
with MIN/MAX
contact /
K3 or /K8
Type E
without contact
without pulse
Type E
with MIN contact
/K1 or /K6
Type E
with MAX contact
/K2 or /K7
Type E
with
pulse output
/CP
Quickon
upper "T"
--- MIN contact --- MIN contact --- MIN contact MAX contact Puls output
Quickon
lower "S"
--- --- MAX contact MAX contact Current output Current output Current output Current output
T31.EPS