Flow Switch
In-line Model Q-4E

In Line Flow Switch 1 Inch

Designed for extreme, long-term reliability.

Detects and signals flow change.

Continuously adjustable while in operation.

Four (4) individual Paddle options plus continuous adjustment provides wide operating range.

For use in particle contaminated fluids.

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.

DPDT model available per request.

Flow Range

4–70 GPM (15.14–265 L/m)

Working Temp

180˚F (82˚C) Maximum

Working Pressure

300 psig (2,068 kPa)

Process Connection

1″ NPT

Electrical Switch

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

Enclosure

NEMA 4 / IP 66

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
  • Fluid Blending Systems
  • Transformers
  • High Power Transistors
  • Vacuum Systems
  • Railroad Engine Lubrication Systems

Other Uses:

  • Monitor Filter Clogging
  • Starting Back-up Pumps Fire Sprinkler Flow Alarms

Models

ORIFICE/ PADDLE # CONTINUOUS SWITCH POINT ADJUSTMENT RANGE
1 4 to 8 GPM
2 6 to 20 GPM
3 15 to 35 GPM
4 25 to 70 GPM

Q4
Group

Q-4E

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 psig max. @ 180˚F max (Proof tested to 1,200 psi @ 70˚F)

WORKING TEMPERATURE
180˚F max. (May be extended to 200˚F for short periods.)

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, 1/2 hp @ 125 or 250VAC .A @ 125VDC, .A @ 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. Model Q-4E can also be fitted with a SPDT Gold Cross Bar Switch for computer/PLC interface.

Diagram

q4-diagram