It's a switch.

Proteus 500 Series flow switches measure and monitor liquid flow.

You can accurately select from 16 trip points with an easily-accessed

switch. Trip points can be incremented in steps of 6% of the full flow

range. Because you can set the flow switch set point yourself, you

can maintain strict control over your flow parameters without additional

instrumentation.

It's a meter.

500 Series flow switches are calibrated to provide a 5VDC output for

their maximum rated flows. This output is accurate to within ± 2% of

range, assuring you that your liquid flow is within your specification.

The actual flow rate can be displayed on a digital voltmeter. Scaled

digital display meters are available to provide direct flow readout in

GPM or LPM.

It's a switch and a meter in a single unit.

A flow switch combined with a metering function permits display of

the flow rate while providing an accurate and predictable set of trip

points. A three-color LED indicator that acts like a traffic signal shows

actual flow status. When green, flow rate is more than 15% above

your selected trip point. An amber light shows that flow is within

15% of your trip point. When flow falls below your trip point, a red

light is displayed. As flow falls below your selected trip point, the

built-in relay contacts open, indicating the alarm condition to your

control system.

Even if your application doesn't require continuous feedback of

the actual liquid flow rate, the calibrated output affirms that your

process is being managed properly. Guess work is eliminated. And if

control parameters do need to be changed you can make exact and

repeatable changes as required.