ONICON FB-3500 Series - Manual (Page 19)

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FB-3500 Bi-Directional Insertion Electromagnetic Flow Meter Manual 05/14 - 0718-3
Page 19
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the meter is not fully withdrawn.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 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 3:
After the meter is completely
withdrawn, slowly close the
valve to isolate flow.