Flow Switch
In-line Model Q-1

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.

DPDT model available per request.

Flow Range

0.12–8 GPM (0.45– 30.4 L/m)

Working Temp

180˚F (82˚C) Maximum

Working Pressure

300 psig (2,068 kPa)

Process Connection

½” NPT

Electrical Switch

SPDT (single pole double throw) 15A or Dry Circuit

Enclosure

NEMA 4

Uses

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

Models

ORIFICE # CONTINUOUS SWITCH POINT ADJUSTMENT RANGE
1 0.12 to 0.25 GPM
2 0.25 to 0.50 GPM
3 0.50 to 1 GPM
4 1 to 2 GPM
5 2 to 4 GPM
6 4 to 8 GPM

Specs

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.)

Diagram

diagram_q-1