Dwyer Instruments SERIES AFS Catalog Page

1 NPT

1-25/32 HEX

[50.80]

SERIES AFS

ADJUSTABLE FLOW SWITCH

For Oils, Water and Gases, Innite Adjustments

2

3/4

[19.05]

1-1/4

[31.75]

1/2 NPT
BOTH ENDS

4-1/8 [104.78]

Flow Switches,

Shuttle/Piston

The Series AFS Adjustable Flow Switch is externally adjustable piston-type ow

switches for oils, liquids and gases. This Series offers an innite number of ow
settings from 0.5 to 20 GPM.

FEATURES/BENEFITS

• Externally adjustable ow set point

• Offers a number of ow settings at pressures up to 1000 psig, with low pressure drop
and precise repeatability

APPLICATIONS

• Protecting machine tools from coolant ow failure

• Protecting bearings from loss of lubricant

• Assuring proper air ow

• Water or compatible liquid control

• Oil ow control

• Control of gas ows

MODEL CHART
Model Media Electrical Connection Piston Housing
AFS-131

AFS-141
AFS-151
AFS-231
AFS-251
AFS-132
AFS-142
AFS-152
AFS-232
AFS-252

Oil
Water
Liquids
Gases
Gases
Oil
Water
Liquids
Gases
Gases

Wire leads
Wire leads
Wire leads
Wire leads
Wire leads
1/2˝ NPT conduit
1/2˝ NPT conduit
1/2˝ NPT conduit
1/2˝ NPT conduit
1/2˝ NPT conduit

Brass

Polysulfone

316 SS
Brass
316 SS
Brass

Polysulfone

316 SS
Brass
316 SS

Brass
Brass
316 SS
Brass
316 SS
Brass
Brass
316 SS
Brass
316 SS

SPECIFICATIONS
Service: Compatible gases or liquids.

Wetted Materials: Housing and Piston: See model chart; Spring: 316 SS;

O-ring: Fluoroelastomer; Other: Epoxy.
Temperature Limits: -20 to 300°F (-29 to 149°C), -20 to 225°F (-29 to 107.2°C)
with polysulfone piston.

Pressure Limit: 1000 psi (68 bar).
Accuracy: ±10% of set point.
Repeatability: ±1% maximum deviation.
Switch Type: SPDT.
Electrical Rating: .17 A @ 120 VAC, .08 A @ 240 VAC, .13 A @ 120 VDC, .06 A @

240 VDC.
Electrical Connections: 18 AWG, 24˝ (61 cm), polymeric lead wires, optional 1/2˝
male NPT conduit connection.

Process Connection: 1/2˝ female NPT ports.
Mounting Orientation: Any.
Set Point Adjustment: Liquids: 0.5 to 20 GPM (1.9 to 75.7 LPM); Gases: 1.0 to 75

SCFM (28 to 2124 LPM) at 5 psig.

Required Filtration: 50 microns or better.
Weight: 2 lb, 11 oz (1.22 kg).
Agency Approvals: CE.

USA: California Proposition 65
WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

DWYER INSTRUMENTS, INC. |

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