Onicon FT-3500 - Removal of the Meter

FT
-
3500 ELECTROMAGNETIC FLOW METER
ONICON Incorporated 727.447.6140 Page 23 onicon.com
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withdrawn, slowly close the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.
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
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 eort required to hold the meter will be 0.11 times the pipe pressure.
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.
NOTE:
The hot tap
adapter will
contain a small
amount of water.
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If the valve touches anything, it means the meter is not fully withdrawn.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.)
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.