L-737-3-E
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5.6 Securing the Sensor Unit and Piping Clamps
To ensure accurate and consistent measurement, observe the following guidelines:
This is particularly important in applications where excessive piping vibration is observed, or during low flow
measurement.
◦Secure adequate rigidity between the mounting base and piping clamps both upstream and downstream.
◦Ensure rigid installation of piping clamps without using cushioning materials, such as rubber pads.
◦Secure adequate rigidity of the piping assembly itself from the sensor unit to piping clamps.
◦A change in the spring elements in the area surrounded by dotted lines may cause zero drift.
The sensor unit and mounting base are secured with four M10 bolts (designed to prevent them from
loosening) when shipped from the factory. On the rare occasion you find loose bolts, retighten them.
◦Secure the mounting base to a sturdy pedestal that is firmly fixed to a place without vibration.
CAUTION:
Secure the sensor unit firmly to a sturdy pedestal through the mounting base,
using M12 bolts and nuts (customer to furnish). With possible inadequate
seating of the mounting base on the pedestal in mind, OVAL furnishes
eight sets of spherical washers and four sets of flange nuts as standard
accessories with the product. Use them in combination with M12 bolts.
Fig. 5.7 Piping Clamps
Piping Clamp
Piping Clamp
Valve
50 to 500mm50 to 500mm
Pedestal
Mtg. Base
400mm
min.
OUT
IN
Increase the rigidity of
the whole assembly
surrounded by dotted
line as high as possible.
Secure firmly using
anchor bolts, etc.
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