Yokogawa RAKD - Manual (Page 13)

<2. PRECAUTIONS>
2-1
IM 01R01B30-00E-E 5th edition January 01, 2013 -00 All Rights Reserved. Copyright © 2003, Rota Yokogawa
2. Precautions
2.1 Transportation and Storage
Before transporting the unit, it is recommended to fix the float with a card-board strip in the same way as
when shipped from factory. Prevent foreign objects from entering the tube (e.g. by covering openings).
To protect the unit and especially the tube’s interior from soiling, store it only at clean and dry locations
2.2 Installation
Ambient temperature and humidity of the installation location must not exceed the specified ranges. Avoid
locations in corrosive environments. If such environments are unavoidable, ensure sufficient ventilation.
Although the RAKD features a very solid construction, the instrument should not be exposed to strong
vibration or impact stress.
Please note that the RAKD is magnetic sensing system can be influenced by external inhomogeneous
magnetic fields (such as solenoid valves). Alternating magnetic fields (≥ 10Hz) as well as homogeneous,
static magnetic fields (in the area of the RAKD), like the geomagnetic field have no influence. Asymmetric
ferromagnetic bodies of considerable mass (e.g. steel girders) should be kept at a distance of at least 250 mm
from the RAKD.
To avoid interference, the distance between two adjacent RAKDs must be at least
120 mm.
Do not expose the unit to pressures higher than the indicated maximum operating pressure (refer to
specifications)
Make sure that wetted parts are resistant against the process medium.
Ambient- and process-temperature may exceed specified maximum values. Note the temperature curves in
fig. 2-1 and chapter 7 "Technical data".
The Rotameter must be mounted vertically. The flow direction is upwards.
Fig. 2-1. For option /KS1or /KN1 (Ex-version) the maximum values for ambient and process temperature
according to the respective temperature class mentioned in fig. 3-2 and tables 7-2 to 7-5 must
be regarded. The minimum ambient temperature is -25°C.
50 55 60 65 70
75
100
200
Illustration of maximum allowable operation temperature depending on
ambient temperature for Rotameter type RAKD
Max. operation temperatur
e
[°
C]
Ambient temperatur [ °C]
75 80
125
150
175
225
250
275
Version without valve Version with valve F21.EPS