Description
Long-stem flow detection for reliable pump and dosing control
The Harwil HRQ12D Flow Switch is a compact, purpose-built device for sensing liquid flow in small piping systems. With a 1/2" MPT connection and an extended stem, this model is designed to reach deeper into piping runs or fittings where standard-length switches cannot. The HRQ12D uses a mechanical paddle to detect flow and provides a pilot-duty output (SPNO) for control circuits. Built in the United States, it combines straightforward functionality with a rugged, space-saving profile for use in pump systems, chemical dosing, and general flow monitoring.
Key Features
Connection: 1/2" MPT (male pipe thread) for easy integration into standard plumbing.
Long stem: Extended insertion length for deeper installation and more versatile placement.
Mechanical paddle actuation: Simple, reliable flow sensing with no electronics required for detection.
Pilot duty SPNO: Single-pole, normally open switch output suitable for control circuits.
Made in the USA: Domestic manufacture and compact construction.
Typical uses: Pump flow sensing, low-flow settings, chemical dosing control and other small-system applications.
Installation note: Wiring and final installation should be performed by a qualified or certified electrician.
Why clients choose this long-stem Harwil switch
Users prefer the HRQ12D when they need a dependable, no-frills flow switch that fits into constrained spaces or deeper fittings. The long stem extends installation options without sacrificing the simplicity of a mechanical paddle and pilot-duty contact. Its compatibility with common 1/2" MPT piping and suitability for pump and dosing control make it an economical, easy-to-service choice for maintenance teams and system builders looking for reliable flow detection in small-scale fluid systems.
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