Harwil Corp. products

In Line Flow Switch 1/2 Inch. Designed for extreme, long-term reliability. Detects and signals flow change. Continuously adjustable while in operation. 6 interchangeable orifices plus 2:1 continuous switch adjustment with each orifice. Calibrated independent of line pressure and temperature. Maintains calibration limits when subjected to reasonable line hydraulic hammer or surge pulses. Super-simple maintenance and checkout for personnel using a standard test meter. Model Q-1 can also be fitted with a SPDT gold cross-bar switch for computer/PLC interface.

Since the mid 1980`s the Harwil Q-12 flow switch has been used by some of the largest companies in the Pool & Spa and fluid control industries. The Q-12 has several factory adjustable parameters that provide the flexibility to meet the requirements of almost any application. The Q-12 verifies fluid flow, typically in conjunction with another device. For example most of swimming pool salt chlorine generators use the Q-12 to verify sufficient flow before the generator is energized. In a spa or hot tub the Q-12 ensures sufficient flow to prevent the water heater from a meltdown. In a chiller the Q-12 prevents the system from freezing.

The Q-16 Stainless Steel is the newest addition to Harwil’s heavy-duty line of flow switches. The switch is used to signal, start, or stop electronically operated equipment when flow or no-flow conditions occur. The Q-16 Stainless Steel benefits from 40 years of flow switch development experience for every conceivable application.

Model Q-10 can be provided with three factory adjustable parameters which provide performance flexibility to meet a multitude of applications: Paddle Area. Paddle Length. Paddle Stiffness. Responds to fluid flow only, independent of line pressure and temperature.  Max. flow may be five times normal flow.

During normal operations flow switches increase efficiency, save time and money by the continuous monitoring of deviations from optimum flow rates. During emergency conditions flow switches signal system malfunctions such as line breakage, pump failure, incorrect valve opening or closing, pipe, valve or filter clogging, etc.

Featuring continuously adjustable float buoyancy control to allow use in fluids with specific gravity down to 0.6. Continuous buoyancy control allows switch activation at oil/water interface. May be used in hazardous areas when used with intrinsically safe relays. Consult factory for other dual-component fluid interface systems. Horizontal Mounting Only High/Low Liquid Level Alarm Solenoid Valve On/Off Control.

The L-21 is a low cost, high performance level switch made from highly durable plastics. It features a variable liquid level differential and a single point pump up/pump down level control.

The CF-112 Chemical Feed Pump Controller is a stand-alone controller that automatically actuates a chemical feed pump when primary bulk fluid (water) begins to flow.  An example would be to start a chlorine injection pump when the water flow starts and turns the injection pump off when the flow stops.

CF-8 Chemical Feed Pump Controller is a stand-alone controller that automatically actuates a chemical feed pump when primary bulk fluid (water) begins to flow.  An example would be to start a chlorine injection pump when the water flow starts and turns the injection pump off when the flow stops.  The CF-8 Chemical Feed Pump Controllers are also used to control irrigation chemical feeders and UV lights or Ozone generators on swimming pools

Chemical Feed Pump Controller is a stand-alone controller that automatically actuates a chemical feed pump when primary bulk fluid (water) begins to flow.  An example would be to start a chlorine injection pump when the water flow starts and turns the injection pump off when the flow stops.