Harwil

Harwil Corporation’s wide range of liquid level switches provide level control solutions for many industries including chiller, scrubber, carpet cleaning machinery, water treatment, fluid handling and truck/automobile wash industries.

Harwil flow switches have provided reliable solutions for many industries including chiller, scrubber, geothermal, water treatment, boiler, carpet cleaner, pool and spa industries.

Wetted materials ranging from red brass, 316 stainless steel, Hastelloy® C-276-276, Noryl® (PPO), and Fortron® (PPS) accommodate fluids from pure water to strong acids and bases.

Q-Series Fluid Flow Switches:

Since 1965, Harwil Corporation’s flow switches have provided reliable solutions for many industries including chiller, scrubber, geothermal, water treatment, boiler, carpet cleaner, pool and spa industries.

Wetted materials ranging from red brass, 316 stainless steel, Hastelloy® C-276-276, Noryl® (PPO), and Fortron® (PPS) accommodate fluids from pure water to strong acids and bases.

With electrical ratings from dry circuit to 15 amp 125/250 VAC temperature/pressure ratings up to 250°F/300 psi and pipe sizes of 3/4 inch or greater, Harwil Corporation flow switches can meet almost any specification requirement.

L-Series Liquid Level Switches:

Harwil Corporation’s wide range of liquid level switches provide level control solutions for many industries including chiller, scrubber, carpet cleaning machinery, water treatment, fluid handling and truck/ automobile wash industries.

Wetted materials range from red brass, 316 stainless steel, Hastelloy® C-276-276, Noryl® (PPO) and Fortron® (PPS) to accommodate pure water to strong acids, bases, and hydrocarbons.
Electrical ratings range from dry circuit to 15 amp 125/250 VAC. Temperature/Pressure ratings to 250°F/300 psi respectively.
With a wide variety of products, Harwil Corporation level switches can meet most specifications.

Pool & Spa Switches:

Harwil Pool and Spa flow switches sense FLOW independent of pressure or temperature. They are superior to pressure switches since often a system may have pressure but not flow. Without the flow of water, chlorine generators, heaters or pumps will fail. Flow switches should be used when system pressure is at or below the threshold of reliable pressure switch operation. Use Harwil Pool and Spa flow switches to protect chlorine generators, heaters and pumps.

Harwil Pool and Spa flow switches are specially manufactured of materials resistant to chemicals typical of swimming pools and spas such as chlorine, sodium chloride and muriatic acid. They are used by many chlorine generator, pool heater and portable spa manufacturers.

We are excited to add a new Temperature Sensing flow switch to our successful line of Pool and Spa flow switches. This feature may be used for a temperature indicator for customer convenience, or to determine salt concentration requirements for salt chlorine generators.

Temperature Sensors:

Harwil Corporation’s Temperature Sensing products are conveniently designed to fit into any standard process pipe fittings of 3/4 inch and larger.

The temperature sensing flow switch senses temperature as well as closes and opens a circuit at specific flow rates. This unique product is perfect for processes where both temperature and flow are critical and eliminates the need for separate, often custom made manifolds for mounting individual flow switches and temperature sensors. The dual function temperature sensing flow switch reduces component count and associated assembly and labor cost.  It may also be used as redundant systems of different technology such as high temperature shut-off in the event of flow switch failure.
Harwil temperature sensing products have wetted  surfaces of Noryl® and 316 stainless steel, for pure water to mild acids and bases, and Fortron® with Hastelloy® C-276-276 for strong acids and bases.
Our temperature sensing products are available in any length of potted PVC jacketed cable or Quick Connect terminals. Customer specified connectors are available for OEM or volume users.

Controllers & Relays:
Harwil Corporation’s controllers are specifically designed to complement Harwil Flow and Level Switch products.

  • The unique L-21 and LC-1 provide latching contacts for pump up/pump down control of solenoid valves or pumps.
  • Model SDC-101 provides a time delay to allow a pump to establish prime before control is turned over to the flow switch.
  • Model CF-112 controls chemical injection pumps based on flow of the bulk liquid.
  • Series 27 Intrinsically Safe Relay allows any Harwil Flow or Level Switch to be used in hazardous areas. Approved for use in Class I, Groups A, B, C, D; Class II, Groups E, F, G; and Class III, Division 1 hazardous locations. The S27 also has a latching wiring option.

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