AVF250 Operation Manual OP250.1.1.7Z.R8ENG
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8. Installation Considerations and Maintenance
(1) Before installation, please sweep the process pipe first so as to avoid any magnetic particles remained inside pipe
as it will influence flowmeter’s performance or cause damage to flowmeter due to adhesion onto flowmeter. If it’s
unavoidable, please install filter before flowmeter’s inlet.
(2) The installation can be vertical and horizontal. If vertical, its centerline should not deviate more than 2°. If horizontal,
its horizontal centerline should not deviate more than 2°.
(3) The size in upstream pipe and downstream pipe should be the same with that of flowmeter, so does the connecting
flange with flowmeter’s flange. And straight pipe distance of upstream should be the 5 times of flowmeter’s size;
straight pipe distance of downstream should be more than or equal to 250mm. Please see page 7 for more details.
(4) As this flowmeter’s signal is transmitted by magnetic coupling, to ensure flowmeter’s performance, there shouldn’t
be magnetic objects around, at least 10cm away.
(5) If measuring gas in the pipe, gas should not be drained directly from flowmeter’s outlet. Otherwise there will be
pressure drop in float which in return will distort data. Thus a valve should be installed around the flowmeter’s outlet,
turning it down slowly during operation.
(6) Flowmeter that has been installed onto pipe should not be influenced by stress. There should be suitable pipe
holding at flowmeter’s inlet and outlet, making this flowmeter staying in a min. stress state.
(7) When you are installing flowmeter that has PTFE liner, please install very carefully, because PTFE will be deformed
because of pressure influence. So do not tighten the flange screws excessively.
(8) After long time’s use, if too many impurities inside pipe, the float will be jammed, or accuracy will not be certain. So
it’s necessary to clean flowmeter’s measuring tube regularly. If magnetic filter has been installed at the inlet of
flowmeter, it has to be cleaned regularly too.
(9) For first-time installation, please keep the 2 points in mind below:
Liquid measurement: when you are about to open valve, please slowly open it to avoid sudden shock damage of
water column to flowmeter if the valve is opened suddenly.
Gas measurement: do not pressurize pipe before opening the valve. If valve opened suddenly, the float will rocket to
stopper and then flowmeter will be damaged probably. So please open valve in a slow way. To measure gas, it’s
better for you to install an air damper device to minimize the shock from float.
(10) If explosion-proof flowmeter’s housing needs to be opened at site for maintenance, please turn off the power first.
(11) For the flowmeter that has liquid crystal screen, please don’t let it be exposed to the direct sunlight as it may reduce
its life.
(12) When to measure medium of low temperature, heating job should be done if heating jacket is not ordered.
(13) Before connection, please confirm power supply, output and correct terminals of power and signal in circuit board
so as to avoid damage due to wrong connection.
