Flow Switch UL Listed Model Q-16 Paddle Style

Flow Switch Paddle Style 1 Inch

THE Q-16. MAXIMUM RELIABILITY, MINIMUM COST.

The Q-16 is the newest addition to Harwil’s heavy-duty line of flow switches. The switch is used to signal, start, or stop electronically operated equipment when flow or no-flow conditions occur. The Q-16 benefits from 40 years of flow switch development experience for every conceivable application.

Harwil’s patented elastomeric sealing system is superior to the metal bellows that are subject to metal fatigue and corrosion. This seal system has been field-proven for over a decade.

The Q-16 can be used in pipes 1 inch and larger, with set points as low as 4 GPM (15.2 LPM) to over 500 GPM (1,893 LPM) in larger pipe sizes. The Q-16 uses a 15A SPDT micro switch that can control a . horsepower motor.

Multiple Quick-Change Paddles

Patented EPDM Seal, Superior To Metal Bellows

Field Adjustable Set Points

Field Adjustable Paddles

Direct Replacement For Most Paddle- Type Flow Switches

Best Flow Sensitivity Among Paddle-Type Flow Switches

Stainless Steel Paddles And Shaft

NEMA 1 Enclosure

Industry-Leading 3 Year Warranty

Flow Range

4–500 GPM (15–1,893 L/m)

Working Temp

250˚F (121˚C) Maximum

Working Pressure

200 psi (1.379 kPa)

Process Connection

1″ NPT

Electrical Switch

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

Enclosure

NEMA 1 (Not for use in hazardous locations)

Approvals

UL 508 & UL 353

Uses

For use in:

  • Boilers
  • Cooling Towers
  • Chillers
  • Water Treatment
  • Irrigation

Models

PIPE SIZE NPT SWITCHPOINT RANGE (GPM)
MIN. ADJUST. MAX. ADJUST.
ON OFF ON OFF
1″ 4 2 8 7
1 1/2″ 7 5 13 11
2″ 12 7 27 26
2 1/2″ 18 12 35 32
3″ 27 19 52 49
4″ 63 50 123 120
5″ 125 100 238 232
6″ 190 158 350 338

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 1 psi

≈ 4″–48″ pipe, negligible

WORKING LINE PRESSURE 200 psig max. WORKING TEMPERATURE 250˚F max. continuous. WETTED MATERIALS

Body: Brass Shaft: 304 Stainless Steel Paddle: 316 stainless steel Seal: EPDM

ELECTRICAL SWITCH CHARACTERISTICS

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

Model Q-16 can also be fitted with a SPDT Gold Cross Bar Switch for computer/PLC interface.

 

Diagram

diagram_q-16