Dwyer 530 User Manual

Model 530 Air Flow Switch

Specifications - Installation and Operating Instructions

Bulletin E-65

The Model 530 Air Flow Switch provides excellent sensitivity and

reliability at a very reasonable price. Quality features include rugged
die cast zinc body, stainless steel vane, silicone rubber gasket and
SPDT snap switch. Unit is easily field adjustable from 400-1600 FPM.
Mounting is fast and simple, requiring only two screws. Vane fits 6 in.
or larger ducts. UL approved. To order, specify Dwyer Instruments, Inc.
Model 530 Air Flow Switch.

CAUTION: For use only with air or non-combustible, non-corrosive
gases. Unit is not sealed against dust.

SPECIFICATIONS
Service: Air and non-combustible gas flow.
Wetted Materials: Contact factory.
Vane: SS.
Temperature Limit: 180°F (82°C).
Switch Type: SPDT.
Electrical Rating: 125 VAC - 9.8 amp full load 58.8 amp locked rotor.

250 VAC - 4.9 amp full load 29.4 amp locked rotor. Pilot Rating: 470 VA
at 125, 250 VAC. Resistive: 15 amp at 125, 250, or 480 VAC.

Electrical Connections: Screw type terminal.
Conduit Connection: 7/8˝ conduit hole.
Mounting Orientation: Horizontal duct flow
Set Point Adjustment: Screw type.
Weight: 1 lb, 1 oz (481.94 g)

DWYER INSTRUMENTS, INC.

Phone: [phone] www.dwyer-inst.com

P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A. Fax: [phone] e-mail: [e-mail]

CAUTION: Vane edges are sharp. Use care when handling.

FLOW SWITCH

ø3-7/16 (87.31)

ø3/32 (2.38)

TYP 2 PLACES

ø1 (25.40)

2-7/16

(61.91)

1/8

(3.18)

TYP

2-7/8

(73.03)

AIR

FLOW

INSTALLATION

1. Select a location in a horizontal duct at least 10 duct diameters from
fans and 7 diameters from elbows, size changes, etc. which can cause
turbulence. Also, avoid areas with excess vibration or where the
temperature limits might be exceeded. Switch must be mounted on top
of a horizontal duct.

4. To make electrical connections, loosen the retaining screw and remove
the conduit enclosure cover. The SPDT snap switch has screw terminals
marked common, normally open and normally closed. A ground screw is
also provided. On increasing flow the normally open contacts will close
and the normally closed contacts will open as the set point is passed.

5. To adjust set point, turn the hex screw located near the ground screw.
Rotate clockwise to increase setting or counter-clockwise to decrease.

2. Use vane as received for 8″ (203 mm) or larger ducts. Trim at notch
for 6″ (152 mm) ducts.

3. Cut a mounting hole and slot for the vane and drill two 3.32” (2.38
mm) screw holes as shown in the full size drawing on the reverse side.
Insert switch through slot and rotate 90° so arrow on switch enclosure
points in direction of air flow. Attach switch to duct with sheet metal
screws provided.

Full Size Mounting Template

6. After all electrical connections and adjustments are complete, replace
conduit enclosure cover.

MAINTENANCE

The only adjustment is that of the set point. Care should be taken to keep
switch dry and free of dust, dirt and oil. No lubrication or routine
maintenance is necessary in normal service.

©Copyright 2014 Dwyer Instruments, Inc. Printed in U.S.A. 3/14 FR# 2C-440532-00 Rev.4

DWYER INSTRUMENTS, INC.

P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A. Fax: [phone] e-mail: [e-mail]

Phone: [phone] www.dwyer-inst.com