Meter Repair Procedures - Elis FLONET FH30 Series Project Design, Installation And Service Manual

ELIS PLZEŇ a. s.
Extraordinary operational conditions of the flowmeter
At the time of the flowmeter commissioning, when the setting of the meter parameters with respect to
the co-operating technology and/or the higher-level computer control system may still have to be
optimised, it can happen that the meter behaviour is irregular.
Description
Unintelligible text on the
display
Meter including display is
functioning well, the meter
menu control does not
work
The measured values of
instantaneous flow rates
fluctuate excessively
including drops to zero flow
rate
Meter is apparently fully
functional but it does not
perform measurements

11.5 Meter repair procedures

If the flowmeter is not functioning as it should, where:
•
No data appear on the display;
•
Connection via the RS-485 communication line does not work; and/or
•
Meter outputs (current, frequency and pulse outputs) are not activated, check the meter power
source and power supply connections.
.
The power supply terminals and connections can be accessed upon removal of the rear cover
on the transmitter housing.
Procedure
1. Switch off the meter power source.
2. Release the Allen bolt securing the closed position of the rear cover on the transmitter housing.
3. Remove the rear cover on the transmitter housing.
4. Check the tightness of the power supply cable conductor connections in the respective terminals.
5. Switch on the meter power source.
ELIS PLZEŇ a. s., Luční 425/15, 301 00 Plzeň, Czech Republic, phone.: +420 377 517 711, fax: +420 377 517 722 Es 90678K
Project design, installation and service manual
Electromagnetic flowmeter FLONET FH30xx
Likely cause
Display or processor board fault
Incorrect procedure in working with the
optical reflex sensors.
Imperfect transmitter or fluid
grounding. In cases of remote meter
version, signal interference. Loose
signal cable. Power line interference.
Excessive content of air bubbles or
solid particles in measured fluid.
Fluid conductivity too low.
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Corrective action
Switch off and on the
meter power; if it does not
help, follow the standard
meter repair procedure
(replace processor board
or display)
See the manual: touch just
one optical sensor at a
time.
In reference to the manual,
check potential
equalisation connections
and sensor and fluid
grounding. Connect a line
voltage filter. Eliminate the
effects of external
interference sources.
Check the correct sensor
installation in the target
technology. Replace
sensor by sensor simulator
(remote meter version
only). Prevent aeration of
the fluid in piping.
Check the fluid
conductivity, consult the
problem with the product
manufacturer.