Harwil Corporation

Harwil Q-1 Inline Flow Switch, 0.12 to 8 GPM, 1/2 in NPT, 300 psig

SKU PFS-QD-1/6/C

$315.70 $527.22

Harwil Q-1 Inline Flow Switch Low flow, high precision. The Harwil Q-1 is an inline flow switch covering 0.12 to 8.0 GPM in 1/2 inch line. It detects and signals a change in flow, and calibration holds independent of line pressure and...

Flow range: See model configuration
Pipe size: See model configuration
Body material: Harwil Corporation

Switch OperationDPDT

DPDT SPDT

Orifice # · Switch-Point Range4 to 8 GPM

4 to 8 GPM 2 to 4 GPM 1 to 2 GPM 0.50 to 1 GPM 0.25 to 0.50 GPM 0.12 to 0.25 GPM

Electrical ConnectionGrommet C

Grommet C Grommet B Grommet AA Grommet A Conduit Fitting F

SKU PFS-QD-1/6/C

Product drawings

2 files

Product diagram Download PNG Electrical diagram Download PNG

This part is made to order. Please allow 1–2 weeks for order processing.

Reference drawing Product diagram Click to Inspect

Harwil Q-1 electrical connection diagram

Reference drawing Electrical diagram Click to Inspect

Drawing help

Check the manufacturer drawings while you build.

1Duty
2Sensing element
3Model configuration
4Electrical

Pipe and target flow

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Use the pipe size and switch point from your system. Do not enter a component code.

Pipe size

Target switch point

Choose a pipe size to see its published operating choices.

Published sensing selection

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Choose only from documented operating ranges or fixed ON/OFF points.

Pipe size and operating duty determine the sensing element.

Model configuration

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Choose the model or switch package that matches the application.

Electrical configuration

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Choose the cataloged switch operation, cable, or conduit connection.

Technical information

Description and specifications

Harwil Q-1 Inline Flow Switch

Low flow, high precision.

The Harwil Q-1 is an inline flow switch covering 0.12 to 8.0 GPM in 1/2 inch line. It detects and signals a change in flow, and calibration holds independent of line pressure and temperature. Six interchangeable orifices, each with a 2:1 continuous switch point adjustment, cover the full range.

Flow and Pressure

Flow Range	0.12 to 8.0 GPM
Line Pressure	To 300 psig
Temperature	180 F continuous
Orifices	6 interchangeable, 2:1 continuous adjustment each

Connection and Body

Pipe Size	1/2 inch
Process Connection	NPT inline
Body Material	Brass

Electrical

Switch Operation	SPDT or DPDT (QD-1)
Switching Capacity	15 amp (SPDT model)
Dry Circuit Option	Computer / PLC interface model available
Hazardous Area	Usable with Harwil intrinsically safe relay

Compatibility

1/2 inch NPT inline installations
Coolant water and process fluids
Alcohols, glycols, oils, pure water, tap water
Contaminated ground water and filtered sewage water

Cross-References

Q-1QD-1

Notes

What is the difference between Q-1 and QD-1?

The Q-1 is the SPDT version. The QD-1 is the DPDT version. Both cover the same 0.12 to 8.0 GPM range.

How is the switch point set?

Each of the six orifices covers a band, and each orifice has a 2:1 continuous switch point adjustment that can be made while the unit is operating.