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- Harwil - Model Q-12 - Flow Switch
Harwil - Model Q-12 -Flow Switch
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.
At home the Q-12 turns on the water disinfection system when someone is getting a glass of water.
- Max. flow may be five times normal flow.
- Positive stop eliminates fatigue effects of turbulence, vibration and flow surge on flow detecting element.
- Very low pressure drop – typically less than 1.0 psig at normal flow rate.
- Small size and low profile provides easy mounting in crowded installations.
- Power the driving coil of small ice cube relays as well as some 30A power relays.
- Switches 5VDC to 240VAC.
- Switch employs magnetic coupling.
- Can be used in ¾ inch to 6 inch pipe.
- Flow Range : 0.7–590 GPM (2.6–2,233 L/m)
- Working Temp : 200˚F (93˚C) Maximum
- Working Pressure : 250 psi (1.724 kPa)
- Process Connection : 1/2" NPT, 3/4" NPT
- Electrical (Reed) Switch : SPNO (single pole normally open) 0.5A*
- Enclosure : NEMA 4X / IP 66
Monitoring flow of coolant supplied to:
- Brakes and Clutches
- Emergency Wash-Down Showers
- Computer Systems
- Marine and Stationary Engines
- Diodes, SCRs, Triacs, etc.
- RF and Radar Transmitters
- Electromagnets
- Spot welders
- Fire Sprinkler Flow Alarms
- Transformers
- Lasers
- Vacuum Systems
In Water Treatment:
- Irrigation Systems
- Salt and Fresh Water Systems
- Chemical Feed Pump Control
In Chemical Processing:
- Fluid Blending Systems
- Liquid Transfer
- Heat Transfer Fluids
- Monitor Filter Clogging
- Liquid Scrubbers
- Starting back-up pumps
- Monitoring pump output, valve position, systems flow status
In Pool and Spa:
- Protect water heater in Spa
- Protect water heater in Pools
- Turn on Salt Chlorinator
- Turn on UV System
- Turn on Ozone System