Bronkhorst CORI-FLOW User Manual download pdf (Page 9)

BRONKHORST CORI-TECH B.V.

Valves for gases

C0I / C1I valve

Direct operating valve for gases

metal sealed

C0I valve = normally closed

C1I valve = normally open

F-004AI valve

Direct operating valve for gases

and liquids. (bellow)

F-004AI valve =Normally closed.

C5I valve

Direct operating valve for gases

metal sealed

C5I valve = normally closed

1.2 Sensor principles

1.2.1 CORI-FLOW sensor

CORI-FLOW mass flow meters/controllers operate according to the Coriolis principle.

The instrument can be used to simultaneously measure the mass flow and temperature.

Measuring Principle

When a fluid flows through a vibrating tube, Coriolis forces are generated which bend or twist the tube.

The extremely small tube displacements are detected by optimally positioned sensors and evaluated

electronically.

Since the measured phase shift of the sensor signals is proportional to the mass flow, the CORI-FLOW

measures the mass flow directly. The measurement principle is independent of the density, temperature,

viscosity, pressure or conductivity. The tubes always vibrate at their natural frequency, which is a function

not only of the tube geometry and the tube material properties but also the mass of the fluid in the vibrating

tubes.

1.3 Valve principles

Control valves are not designed to provide positive shut-off, although some models have excellent

capabilities for this purpose.

It is recommended to install a separate shut-off valve in the line if required. Also pressure surges, as may

occur during system pressurisation must be avoided. The following models can be distinguished:

1.3.1 Solenoid valve

This is considered to be the standard (direct operated) control valve. In general it

is a normally closed solenoid valve. The plunger is lifted by the force of the

magnetic field of the coil. The orifice under the plunger is removable for optimising

the orifice diameter. Also a normally opened solenoid valve is available.

Flow control

valve

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Bronkhorst CORI-FLOW User Manual Page 9