Exam 12: Flow Switches

You can consult the NEC for insulation temperature ratings.

A flow switch may be used to detect_______ over the refrigeration coils, stopping the refrigeration compressor and starting a defrost cycle.

A flow switch either closes or opens a set of gates.

Air condition and heating circuits often use timed contacts that are self-contained and do not require a coil for operation. Their time delay is preset and cannot be adjusted.

A flow switch is a device that can be inserted in a pipe so that when liquid or air flows against a part of the device called a_________ , a switch is activated.

The electrical connections of airflow switches are ____________those of liquid flow switches.

The insulation of the wire leading to the switches must be adequate to withstand the high pressure of the liquid inside the pipe.

In general, a flow switch contains_______ electrical contacts.

Typical applications of flow switches are commonly found in the chemical and petroleum industries.

A flow switch used with_________ may start a motor when flow occurs, and stop the motor when there is no flow.