<1. INTRODUCTION>
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IM 01R01B30-00E-E 8th edition November 01, 2019-00
All Rights Reserved. Copyright © 2003, Rota Yokogawa
1.5 Warranty
NOTE
Please contact the Yokogawa sales organization if
the device needs to be repaired.
The warranty terms for this device are described in
the quotation.
If a defect for which Yokogawa is responsible occurs
in the device during the warranty period, Yokogawa
will repair that defect at its own cost. If you believe
that the device is defective, please contact us and
provide a detailed description of the problem. Please
also tell us how long the defect has already occurred
and list the model code and serial number. Additional
information, such as drawings, simplifies the
identification of the cause and repair of the defect.
Based on our test results, we determine whether the
device can be repaired at Yokogawa’s expense or at
the expense of the customer.
The warranty does not apply in the following cases:
• If the adhesion, blockage, deposit, abrasion or
corrosion is the result of the device’s actual use.
• If the device is mechanically damaged through
solids in the fluid, hydraulic shock, or similar
influences.
• If the instructions in the corresponding General
Specifications or user's manual that must be
met have not been followed.
• In case of problems, errors or damage that
result from unprofessional installation by the
customer, for example due to insufficient
tightness of the pipe fittings.
• In case of problems, errors or damage that result
from operation, handling or storage in rough
ambient conditions that are beyond the
specifications of the device.
• In case of problems, errors or damage that result
from unprofessional or insufficient maintenance by
the customer, for example, if water or foreign
particles enter the device due to opening the
device cover.
• In case of problems, errors or damage that
result from use or from performing maintenance
work on the device in a location other than the
installation location specified by Yokogawa.
• In case of problems, errors or damage that
result from modification or repair work that was not
performed by Yokogawa or by a person authorized
by Yokogawa.
• In case of problems, errors or damage that result
from unprofessional installation, if the location of
the device has been changed.
• In case of problems, errors or damage that result
from external factors, such as other devices that
are connected to this device.
• In case of problems, errors or damage that result
from catastrophic external influences, such as fire,
earthquake, storm, flooding or lightning.
1.6 Principle of measurement
The RAKD is a variable area flow meter for volume
flow or mass flow for clean gases and liquids. It is
build in vertically, the flow direction must be bottom-
up. A float is guided in a concentrically shaped cone.
The flowing fluid exert a lifting force to the float
generated at the lower edge of the float and lifts it to
a certain height, which is
proportional to the flow value. The position of the
float is magnetically transmitted to the indicator,
which indicates the flow value by a pointer on a
scale. The indicator can be equipped with limit
switches and an electronic transmitter.
Fig. 1-1
The RAKD is usually calibrated with water. The user
must specify the process values of the fluid: density and
temperature. These values are used to calculate the
user-specific scale from the calibration data.
F10.EPS
