- Home
- Companies
- Harwil Corp.
- Products
- Harwil - Model Q-1 - In-line Flow ...
Harwil - Model Q-1 -In-line Flow Switch
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.
Monitoring flow of coolant water and fluids supplied to:
- Alcohols
- Contaminated Ground Water
- Filtered Sewage Water
- Glycols
- Oils
- Pure Water
- Soap Solutions
- Tap Water
Monitoring flow of coolants and fluids supplied to:
- Air Conditioning Systems
- Plastic Molding Equipment
- Cooling in Data Centers
- Scrubbers
- Diodes, SCRs, Triacs, etc.
- Spot Welders
- High Power Transistors
- Transformers
- Fluid Blending Systems
- Vacuum Systems
- Railroad Engine Lubrication Systems
Other Uses:
- Starting Back-up Pumps
- Oil Supply to Bearing & Gear Systems
- Monitor Filter Clogging
- Metal Fabrication Systems
Hysteresis (Δ Flow Rate to Activate/Deactivate Switch)
- ≈ 5% at upper end of flow range
- ≈ 25% at lower end of flow range
Differential Pressure Drops Across Unit
- Under normal operating conditions:
- ≈ 1.0 psig at upper end of flow range
- ≈ 5.0 psig at lower end of flow range
Working Line Pressure
- 300 psi max.
Working Temperature
- 180˚F max. (250˚F model available)
Wetted Materials
- Body: Red brass
- Hardware: Noryl® (PPO) (10% glass fibers), Plastic
- Working fluid “sees” red brass, phosphor bronze, and EPDM elastomer seal
- Gasket: Cork/Nitrile blend
- Optional Seal: Hypalon, Viton® or FKM
Electrical Switch Characteristics
- SPDT (single pole double throw)
- 15A, ½ hp @ 125 or 250VAC
- ½A @ 125VDC, ¼A @ 250VDC
- 5A @ 125VAC (tungsten lamp load)
- 10,000,000 operations, median
- (Switch may be overloaded to 20A @ 125 or 250VAC for a minimum of 20,000 operations.)