HollySys HT5 Series Instructions For Use Manual page 17

Metal tube flowmeter
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Will result in these cases in the media flow meter measuring tube is very unstable,
float suffered three forces can not achieve equilibrium caused
by the float up and down, up and down movement of the float
is transmitted by a magnetic coupling system, so do follow the
motion of the pointer Axis system, ultimate expression of
continuous non-stop swing pointer larger output variation
margin. Users can not read the current instantaneous value
scale, transmitter output signal can not be used by the system.
Customers are advised to avoid the above situation, please
select the instrument with additional structural damping
device. Even so, they can not guarantee the stable operation
of the instrument, situations pointer swinging and output volatility does not appear, it
is suggested that users should namely process design, instrumentation installation location,
piping configuration, the voltage boost efforts to fundamentally solve the instrument could
cause unstable situation occurs.
Note: In order to achieve stable operation of the instrument working conditions, in
the selection of design should meet the working pressure stable and not less than 2 times
the pressure loss meter, gaseous medium working pressure should not be less than 5
times the pressure loss of the instrument.
2.11 Mounting accessories - magnetic filter and the straight pipe
Mounting accessories metal tube: the magnetic filter and the straight pipe, a user can
optionally order. The fluid conduit or contain tiny ferromagnetic particles dross purge
is not clean, it should be installed in the instrument magnetic filter to prevent adsorption
of the float when ferromagnetic particles flow through the float, causing float Caton, and
can not return movement not comfortable. Magnetic filter should be cleaned regularly to
prevent smoke filled not achieve filtration.
Location of the installation of the meter shall ensure that there is greater than or
equal inlet straight pipe 5D and export not less than 250mm straight pipe segment, the user
can request the installation location, choose to order straight pipe, to meet the conditions
14

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