Fixed-Setpoint Flow Switches
Since they come factory set to a specific set point, these switches are easier to install than adjustable flow switches. As flowing liquid pushes an internal piston, the switch reads the position of the piston to measure the flow. When the piston passes the set point, the switch actuates. They’re accurate in any mounting orientation.
These switches are calibrated with and measure water accurately. They can also be used with other liquids by applying your liquid’s specific-gravity conversion factor to calculate the new set point.
Choose a fitting material that is compatible with the liquid you intend to run through your line. Bronze and 316 stainless steel fittings resist impact better than plastic fittings.
SPDT (single pole, double throw) switches can either turn one device from off to on (normally open) or from on to off (normally closed).
Stainless Steel Body
with Female Fittings
Conduit | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Pipe Size  | Thread Type | Gender | Set Point, gpm | Approx. Difference Between Setpoint and Reset Point, gpm | Max. Pressure | Temp. Range, °F | Max. Switching Current @ Voltage | Trade Size | Thread Type | Gender | End-to-End Lg. | Mounting Orientation | Each | |
Bronze Body with Bronze Fittings | ||||||||||||||
SPDT | ||||||||||||||
| 1 1/4 | NPT | Female | 1 | 0.15 | 400 psi @ 70 ° F | -20° to 300° | 400 mA @ 30 V AC 170 mA @ 120 V AC 80 mA @ 240 V AC 300 mA @ 30 V DC 130 mA @ 120 V DC 60 mA @ 240 V DC | 1/2 | NPT | Male | 4" | Any | 00000000 | 0000000 |
| 1 1/4 | NPT | Female | 4 | 0.6 | 400 psi @ 70 ° F | -20° to 300° | 400 mA @ 30 V AC 170 mA @ 120 V AC 80 mA @ 240 V AC 300 mA @ 30 V DC 130 mA @ 120 V DC 60 mA @ 240 V DC | 1/2 | NPT | Male | 4" | Any | 00000000 | 000000 |
| 1 1/4 | NPT | Female | 20 | 3 | 400 psi @ 70 ° F | -20° to 300° | 400 mA @ 30 V AC 170 mA @ 120 V AC 80 mA @ 240 V AC 300 mA @ 30 V DC 130 mA @ 120 V DC 60 mA @ 240 V DC | 1/2 | NPT | Male | 4" | Any | 00000000 | 000000 |
Fixed-Setpoint Hazardous Location Flow Switches
Safe to use where flammable gases and combustible dust may be present, these switches activate or deactivate when your flow reaches a factory-set level. All are UL listed for hazardous environments. Because their set point is fixed, they’re ready to go, making them easy to install. They actuate when your flowing liquid or gas pushes their paddle into a set position. These switches are single pole, double throw (SPDT) and can turn one device from off to on (normally open) or from on to off (normally closed). They must be mounted horizontally to function accurately.
These switches are calibrated with water and air. They can also be used with other liquids and gases but may not measure accurately if their viscosity is significantly different.
Set Point | Conduit | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Pipe Size | Thread Type | Gender | For Liquids, gpm | For Gases, scfm | Max. Pressure | Temp. Range, °F | Voltage | Max. Switching Current | Trade Size | Thread Type | Gender | End-to-End Lg. | Each | |
Brass Body | ||||||||||||||
| 1 1/4 | NPT | Female | 4 | 21 | 250 psi @ 70° F | -4° to 220° | 120V AC/ 240V AC | 5 A @ 120 V AC | 3/4 | NPT | Male | 2 5/8" | 00000000 | 0000000 |
Fixed-Setpoint Insertion Flow Switches
Easy to install, these flow switches come already set to a specific set point and don’t require you to disassemble your pipeline. Instead of mounting them inline, insert them into an unthreaded PVC pipe tee or pipe outlet in large-diameter pipe. They have a paddle that’s pushed as your liquid moves through to determine flow. When the paddle reaches a set position determined by the set point, it activates or deactivates equipment. All are single pole, double throw (SPDT) and can either turn one device from off to on (normally open) or on to off (normally closed). IP rated, they seal out dust and can be lightly rinsed.
They should be mounted vertically into a horizontal pipeline, so liquid pushes the paddle. Secure them with PVC cement and primer (not included).
These flow switches are calibrated with water. You can use them with other liquids, but they may not measure accurately if the liquid’s viscosity differs from water.
| Pipe Size | For Pipe Size | Set Point, gpm | Max. Flow Rate, gpm | Max. Pressure | Temp. Range, °F | Max. Switching Current @ Voltage | Body Ht. | Environmental Rating | Specifications Met | Each | |
Noryl Plastic Body | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Socket Connection | |||||||||||
| 3/4 | 1, 1 1/4 | 2.7, 6.8 | 31, 40 | 160 psi @ 70° F | -13° to 212° | 1 A @ 230 V AC, 1 A @ 48 V DC | 2 1/2" | IP65 | UL 508 | 00000000 | 0000000 |