Flow Switch
Adjustable Model Q-8

Adjustable Flow Switch

During normal operations flow switches increase efficiency, save time and money by the continuous monitoring of deviations from optimum flow rates. During emergency conditions flow switches signal system malfunctions such as line breakage, pump failure, incorrect valve opening or closing, pipe, valve or filter clogging, etc.

Designed for long-term reliability and chemical resistance.

Detects and signals flow change.

Seal is continuously flushed by the working fluid. Available with Optional Rubber Boot.

Continuously adjustable while in operation.

Responds to flow only, independent of line pressure, temperature, environment

Super-simple maintenance and checkout for personnel using a standard test meter.

Flow Range

8–1,900+ GPM (30–7,192 L/m)

Working Temp

200˚F (93˚C) Maximum

Working Pressure

50 psig (690 kPa) @ 180˚F (N)

50 psig (690 kPa) @ 200˚F (CR)

Process Connection

1″ NPT

Electrical Switch

SPDT (single pole double throw), 1/2hp 15A or Dry Circuit

Enclosure

NEMA 6P IP 67

Uses

Monitoring fluid flow in:

  • Air Conditioning Systems
  • Industrial Refrigeration Systems
  • Cooling in Data Centers
  • Pools and Spas
  • Chillers
  • Scrubbers
  • Fluid Blending Systems
  • Water Treatment Systems
  • Natural Gas

Models

PIPE SIZE NPT CONTINUOUS SWITCH POINT ADJUSTMENT RANGE SHAFT LENGTH PADDLE SIZE
1″ 12 to 20 GPM 1 2
24 to 34 GPM 1 1
1 1/2″ 16 to 28 GPM 2 3
25 to 37 GPM 2 2
38 to 70 GPM 2 1
2″ 30 to 50 GPM 2 3
44 to 65 GPM 2 2
67 to 90 GPM 2 1
3″ 45 to 140 GPM 3 3
100 to 145 GPM 3 2
152 to 200 GPM 3 1
4” 80 to 170 GPM 3 3
175 to 240 GPM 3 2
160 to 290 GPM 3 1

Q8
Group

Q-8

Q-8CR

Q-8CR/BOOT

Q-8DS

Q-8N

Specs

HYSTERESIS (Δ FLOW RATE TO ACTIVATE/DEACTIVATE SWITCH)
≈ 10% at upper end of flow range
≈ 30% at lower end of flow range

DIFFERENTIAL PRESSURE DROPS ACROSS UNIT
Under normal operating conditions:
≈ 1″–3″ pipe, less than 0.5 psi
≈ 4″–10″ pipe, negligible

WORKING LINE PRESSURE:
50 psi max., operating @ 180˚F 100 psi max. non-operating @ 180˚F Pressure over 50 psi can affect the switch point range

ELECTRICAL SWITCH CHARACTERISTICS
SPDT (single pole double throw) 10,000,000 Operations Median 15A, 1/2 hp @ 125 or 250VAC .A @ 125VDC (tungsten lamp load)

Model Q-8N can also be fitted with a SPDT Gold Cross Bar Switch for computer/PLC interface.

Diagram

diagram_q-8