Harwil Q-8DS Flow Switch, 5 to 80 GPM, 1 in NPT Side Port, SPDT 15 Amp
SKU PFS-Q-8DS/3/10566/C
Harwil Q-8DS Flow Switch Protects the heater. The Harwil Q-8DS senses low flow independent of pressure or temperature and cuts power or gas to a heater before it can melt down. It resets automatically as soon as flow is re-established, and drives...
- Flow range
- See model configuration
- Pipe size
- See model configuration
- Body material
- Harwil Corporation
Product drawings
2 filesBuild from your operating duty
Choose the operating duty and product options. The builder identifies the published sensing configuration and matching SKU.
Reference drawing
Product diagram
Click to Inspect
Reference drawing
Electrical diagram
Click to Inspect
Check the manufacturer drawings while you build.
- 1Duty
- 2Sensing element
- 3Model configuration
- 4Electrical
Pipe and target flow
Use the pipe size and switch point from your system. Do not enter a component code.
Pipe sizeChoose a pipe size to see its published operating choices.
Published sensing selection
Choose only from documented operating ranges or fixed ON/OFF points.
Pipe size and operating duty determine the sensing element.
Model configuration
Choose the model or switch package that matches the application.
Electrical configuration
Choose the cataloged switch operation, cable, or conduit connection.
Technical information
Description and specifications
Harwil Q-8DS Flow Switch
Protects the heater.
The Harwil Q-8DS senses low flow independent of pressure or temperature and cuts power or gas to a heater before it can melt down. It resets automatically as soon as flow is re-established, and drives pump motors, heaters and solenoid valves directly.
| Operating Range | 5 to 80 GPM |
|---|---|
| Pipe Size | 1 1/2 inch or 2 inch |
| Process Connection | 1 inch NPT side port in any plastic tee |
| Mounting | Horizontal, vertical or inverted |
| Reset | Automatic when flow is re-established |
| Body | Noryl (PPO) |
|---|---|
| Shaft Length | Short, Medium, Long |
| Switch Operation | SPDT |
|---|---|
| Standard Rating | 1/2 hp, 15 amp at 115 or 230 VAC |
| Special Order Rating | 25 amp, 1 hp at 120 VAC, 2 hp at 230 VAC |
| DC Rating | 1/2 amp at 125 VDC, 1/4 amp at 250 VDC |
| Lamp Load | 5 amp at 125 VAC tungsten |
| Life | 10,000,000 operations median |
| Listings | UL and CSA listed, UL Component Recognized file E85349 |
- Pool and spa heater flow protection
- Direct control of pump motors
- Solenoid valve control
- Any plastic tee with a 1 inch NPT side port
Does it reset on its own?
Yes. The Q-8DS resets automatically and is ready to go as soon as proper flow is re-established.
Can it switch a heater directly?
Yes. It is rated for direct control of pump motors, heaters and solenoid valves at 1/2 hp, 15 amp, 115 or 230 VAC as standard.