<2. PRECAUTIONS>
2-1
IM 01R01B30-00E-E 8th edition November 01, 2019-00
All Rights Reserved. Copyright © 2003, Rota Yokogawa
2. Precautions
2.1 Transportation and Storage
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. Prevent foreign objects from entering the tube (e.g. by covering the 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 magnetic sensing system of the RAKD can be influenced by external inhomogeneous
magnetic fields (such as solenoid valves). Alternating magnetic fields (
≥
10 Hz) 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 not exceed specified maximum values. Note the temperature curve in
fig. 2-1.
The Rotameter must be mounted vertically. The flow direction is upwards.
Fig. 2-1 Temperature specification
For explosionproof types the maximum values for ambient and process temperature according to the respective
temperature class mentioned in chapter 7 must be considered.
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. process temperature in °C
Ambient temperature in °C
75
80
125
150
175
225
250
275
Version without valve
Version with valve
