Harwil Corp.

The Q-5 is available in brass or stainless steel. It is a 1 inch paddle style switch for 1 to 12 inch pipe. This switch typically lasts 25-35 years. It usually lasts longer than the system where it is installed or the person who installed it. There is no other flow switch more durable than the Harwil...

The Q-16SS is the best paddle style flow switch and is now available in stainless steel. You can replace all those brass switches that contain toxic lead. Q-16SS

THE PROBLEM Failure to establish flow after the pump has been turned on. Failure to maintain proper flow during normal operation due to line clogging, line rupture, incorrect valve positioning, etc. THE SOLUTION Use an SDC-101 shut down control on the input power of pumps, heaters, valves, etc.,...

The combination of any two Harwil liquid level switches and the LC-1 electronic control module mounted in a weather-resistant box provide a ready-to-go system for the automatic filling or emptying of tanks or vessels. (Pump-Up / Pump-Down)

The L-40 is ideal for a high or low level indicator switch or can be used in pairs with a latching level controller (LC-1 or Wireless Switches.) This switch is ideal for tank or pond level control. It features a 10 watt reed switch and can be Normally Open (NO) or Normally Closed (NC.)

The L-21 is a magnetically coupled level switch that can have 1, 2, 3 or 5 inch differentials. This switch is ideal for pond level control as it is not affected by waves or turbulent water. The L-21 features a 15 amp micro switch that can run up to a 1/2 hp motor.

Side and Top Mount (Horizontal or Vertical) Corrosion-resistant plastic with optional metal pivot pin (available in 316 stainless steel, HASTELLOY C, Titanium, or Teflon or PTFE). 10 times less sensitive to deposits or build-up of contaminants than sliding float Level Switches. Each unit can...

Side and Top Mount (Horizontal or Vertical)

Water level control in ponds, water falls, or fountains is simple using the Harwil L-21N Liquid Level Switch. The L-21N offers 1, 3 or 5 inches of water level control so the pump or solenoid valve is not affected by wind or waves. Keep it always full, functioning and beautiful.

Controls chemical feed pumps, UV or Ozone when water flow is detected. Detects down to 0.7 GPM is a 3/4 inch water line. Includes power and flow indicatory lights and fits up to 2 inch water pipes. Available in 110 or 220 volt AC.

The Q-16 is available in brass or stainless steel. It is a 1 inch paddle style style switch for 1 to 12 inch pipe. The brass version is UL 508 and 353 listed by ETL. The Stainless Steel version is designed for protected or indoor drinking water applications.

There are millions of the Q-12 flow switches in service today. It is used by Hayward, Pentair, and Jacuzzi to control and ensure the correct flow rate in their equipment. It is made from the engineered resin Noryl and features a 1/2 or 3/4 inch NPT process connection and can be used in potable water.

The Q-10 flow switch is a heavy duty yet very sensitive switch. It is commonly used in automated or powered irrigation systems to detect when flow has been interrupted. It is made from the engineered resin Noryl and features a 1 inch NPT process connection.

The Q-16 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 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:

Controls chemical feed pumps, UV or Ozone when water flow is detected. Detects down to 1 GPM is a 1 inch water line. Includes 2 or 4 receptacles and fits up to 6 inch water pipes. Available in 110 volt AC.

Controls chemical feed pumps, UV or Ozone when water flow is detected. Detects down to 0.7 GPM is a 3/4 inch water line. Includes 2 or 4 receptacles and fits up to 2 inch water pipes. Available in 110 volt AC.