DWYER INSTRUMENTS Flow Switches

Dwyer Instruments flow switches are designed for providing electrical feedback at a specific flow rate in applications including boilers, hot water heaters, chillers and hydro-pneumatic tanks. These units feature a magnetic-actuated design with a weatherproof and explosion-proof body for withstanding outdoor applications and side wall mounting configuration for easy accessibility and quick maintenance. The brand's Series V10 Flotect flow switches allow field-calibrated switch adjustments to toggle between NO (Normally Open) or NC (Normally Closed) operations; thereby eliminating the need to fiddle with the electrical connections. Choose from a wide range of these products available in pipe sizes ranging from 1/2 to 2 inches on Raptor Supplies, an authorised Dwyer Instruments distributor.

How to install this Dwyer flow switch?

• Make sure you carefully unpack the switch and take any packaging out of the lower housing.
• The vane should be trimmed at the proper mark depending on the pipe size being utilised.
• Install the switch in the system piping with the arrow on the side pointing in the direction of flow and then apply pipe thread sealant to the 1/2 inch male NPT mounting threads.
• Install wiring in accordance with regional electrical regulations.
• When assessing system loads and currents, use caution. After installation, set the switch action to NO (usually open) or NC (normally closed).
• When a reed switch is activated by an increase in flow, usually closed connections open and normally open contacts close.
• The two screws on the top cap must be loosened but not removed in order to replace them.
• To reveal the specified switch action, slide the reed switch assembly.
• When the adjustment is finished, tighten the screws.

What is the difference between inductive, capacitive and lamp load current ratings?

An inductive load is due to an electromagnetic solenoid, electromagnetic relay and electromagnetic counter with an inductive component as a circuit load. A capacitive load is a capacitor connected in series or parallel with a reed switch control. In a closed circuit, a cable length, generally greater than 50 metres, is used to connect the reed switch which may also evolve static capacitance. A lamp load can occur because of a tungsten filament lamp load.

What do actuation and de-actuation mean?

Actuation refers to the phenomena when a microswitch trips or the contacts of a microswitch change their state. De-actuation occurs when the flow rate is low enough for the microswitch to revert to its default setting.

Does Raptor Supplies provide DPDT switch variants of Dwyer Instruments flow switches?

Yes, Dwyer Instruments V6EPB-B-D-2-MI flow switch features a DPDT switch that and is available on Raptor Supplies.