Yokogawa RotaMASS 3-Series - Manual (Page 183)

8. SElF-dIAgNOSTIC ANd TrOUBlESHOOTINg
8-7
IM 01R04B04-00E-E 8th edition March 01, 2011 -00 All Rights Reserved. Copyright © 2003, Rota Yokogawa
8.7.4 Unstable zero
no
yes
yes
no
no
yes
no
Is the tube filled with liquid
completely (check the
density)?
Fill the detector. May be
vertical installation is
indicated.
Are bubbles in the liquid ? Check piping and
installation.
Is the detector installed
free of mechanical stress?
Is electrical grounding
correct according chapter
4 . 8.4; 4.8.5; 9 ?
Make correct grounding.
Is the flowmeter located
near motors, transformers
or other electric
equipments ?
Shield the flowmeter
sufficiently.
Locate the flowmeter as
far as possible from
these equipments.
Is the connection box free
of dirt and humidity? (only
for remote installation)
yes
no
Loose the process
connections and make
sure that they are in line.
Support only one
adjacent pipe, let one
side of the adjacent pipe
be “soft”.
yes
Contact the nearest
YOKOGAWA office or
service center.
yes
no
Clean and dry the
connection box. Make
sure that humidity
cannot penetrate.
F84.EPS