Onicon F-3500 - Removing the Flow Meter; Removal Warnings and Cautions

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F-3500 Insertion Electromagnetic Flow Meter Manual 02/18 - 0665-11 Page 20
WARNING
SYSTEM MAY BE UNDER HIGH PRESSURE. When removing the ow meter, be sure to hold
the electronics enclosure rmly by hand before slowly loosening the positioning clamping
nut. Failure to do this will allow the pressure in the pipe to suddenly and rapidly force the
meter from the pipe causing serious injury. The meter could also be damaged or break apart
causing a break in the water seal with the resultant loss of large amounts of water. The hand
effort required to hold the meter will be 0.11 times the pipe pressure.
!
WARNING
In hot water systems, even a small amount of water can cause serious personal injury. Use extra
caution when working with hot water meters.
!
CAUTION
The main cause of damage to meters comes from accidentally closing the valve on the sensor head.
To avoid this, gently rotate the meter by twisting the electronics enclosure back and forth (twist the
stem, do not bend it) while you slowly close the valve. If the valve touches any part of the meter,
you will feel it as you are twisting the meter. If the valve touches anything, it means the meter is
not fully withdrawn. Usually a gentle twisting motion while withdrawing the meter will clear any
obstruction and permit the meter to withdraw completely. (Excessive build-up on the stem may
require the hot tap “O” ring to be lubricated with silicone.)
!
Step 1:
Slowly loosen the position
clamping nut while
maintaining a rm grip on the
enclosure to counteract the
e󰀨ect of pressure in the pipe.
Step 3:
After the meter is completely
withdrawn, slowly close the
valve to isolate ow.
Step 4:
After the valve is completely
closed, unscrew the hot tap
adapter from the valve. For hot
water meters, partially unscrew
the adapter to vent pressure
before fully removing the meter.
NOTE:
The hot tap
adapter will
contain a small
amount of water.
Step 2:
Carefully
withdraw the ow
meter stem from
the pipe until the
sensor head is
fully inside the
hot tap adapter.
3.4 REMOVAL OF THE METER
IMPORTANT NOTE
Removal of the meter is the same for small pipe conguration meter installations. The clamping
nut can be accessed with the alignment tool installed.
!
i
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