Dwyer AFR User Manual
Series AFR Air Filter Regulator
3
.130
[
79.5]
3
.130
[79.5]
DRAIN
7
-3/4
[
196.8]
2
-19/32
[
65.8]
21/32
[
16.5]
2-53/64
[71.6]
I
NPUT
1
/4˝ NPT
3/8
[
9.6]
G
AUGE PORT
1
/4˝ NPT
OUTPUT
1/4˝ NPT
Specifications - Installation and Operating Instructions
Bulletin F-42-AFR
The Series AFR Air Filter Regulators are designed to provide clean,
accurate air pressure to instruments, valves and other automatic control
equipment under variable conditions. The regulators are designed for air
service only. Maximum allowable inlet pressure is 250 psi. Operating
temperature is 0 to 160°F. The Series AFR has a low capacity internal
relief which provides very limited down stream over pressure protection.
To avoid exceeding outlet pressure limits in service, a pressure relieving
or pressure limiting device should be used.
INSTALLATION
Install the regulator as close as possible to the instrument or tool it is to
service. For best filter drainage, orient the valve so it is at the lowest
point on the dripwell housing. The words “IN” and “OUT” are cast into the
body to indicate the direction of flow.
OPERATION
Turning the adjusting screw changes the force exerted by the range
spring on the diaphragm assembly. In equilibrium of set pressure, the
force exerted by the range spring is balanced by the force from the
output pressure acting underneath the diaphragm.
An unbalanced state between the output pressure and the set pressure
causes a corresponding reaction in the diaphragm and supply valve
assemblies. If the output pressure rises above the set pressure, an
upward force is exerted on the diaphragm assembly causing the relief
seat to lift and open. Excess pressure is vented to atmosphere until
equilibrium is reached. If the output pressure drops below the set
pressure, the unbalanced force of the range spring causes a downward
force on the diaphragm assembly. The supply valve then opens until the
pressure builds up once more to the equilibrium condition.
SPECIFICATIONS
Service: Air only.
Output Ranges: 0 to 10 psi (0 to 70 kPa), 0 to 30 psi (0 to 200 kPa), 0 to
60 psi (0 to 400 kPa), and 0 to 120 psi (0 to 800 kPa).
Maximum Supply Pressure: 250 psig (1700 kPa).
Port Size: 1/4˝ NPT(F) in, out, and gage.
Mounting: Pipe or through body.
3
Flow Capacity: 20 SCFM (33.0 m
/hr) at 100 psig (700 kPa) supply with
20 psig (140 kPa) output.
Exhaust Capacity: 0.1 SCFM (0.17 m3/hr) with downstream pressure 5
psig (35 kPa) above set point.
Sensitivity: 1˝ (2.5 cm) of water.
Air Consumption: Less than 6 SCFH (0.17 m3/hr).
Filter Size: 40 micron.
Effect of Supply Pressure Variation: Less than 0.2 psig (1.4 kPa) for 25
psi (170 kPa) change.
Materials of Construction: Body: Aluminum Alloy, Irridite, and baked
epoxy finish; Filter: Phenolic Impregnated Cellulose; Diaphragm and Valve
seat Plug: Nitrile Elastomer.
Weight: 1.6 lb (725 g).
Under forward flow conditions, the range spring force is balanced by the
diaphragm pressure force, with the supply valve open just enough to
maintain the required equilibrium pressure. When high flow occurs, a
specially designed aspirator helps maintain downstream pressure and
compensates for droop.
Prior to turning on supply air, back off adjusting screw until there is no
compression of the range spring. After turning supply pressure on, turn
the adjusting screw clockwise to increase outlet pressure.
PROXIMITY CONTROLS
A DIVISION OF DWYER INSTRUMENTS, INC.
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A.
Phone: 219/879-8000 www.dwyer-inst.com
Fax: 219/872-9057 e-mail: info@dwyermail.com
See Figures 1 and 2 below for additional performance characteristics.
100
90
80
70
6
0
50
40
30
20
1
0
0
(700)
(
620)
(560)
(480)
(420)
(
350)
(280)
(200)
(140)
(70)
OUTPUT PRESSURE, PSIG (kPa)
EFFECT OF UPSTREAM
PRESSURE VARIATIONS ON
REGULATED PRESSURE
I
NPUT PRESSURE, PSIG (kPa)
5
0
(345)
80
(
552)
100
(689)
90
(620)
70
(483)
60
(414)
RANGE PSIG (kPa)
0-60 (0-400)
0-30 (0-100)
0-10 (0-65)
0
-120 (0-800)
E
FFECT OF CHANGES IN FLOW
O
N REGULATED PRESSURE
100 PSI (6.9 bar) SUPPLY
100
90
80
70
6
0
50
40
30
20
10
0
(700)
(620)
(
560)
(480)
(420)
(350)
(280)
(
200)
(140)
(70)
OUTPUT PRESSURE, PSIG (kPa)
FLOW, SCFM (M3/hr)
2
(3.5)
20
(33.6)
18
(30.2)
16
(26.9)
14
(23.5)
12
(20.7)
10
(16.8)
8
(13.4)
6
(10.1)
4
(6.7)
RANGE PSIG (kPa)
0-60 (0-400)
0-30 (0-100)
0-10 (0-65)
0-120 (0-800)
Figure 1
WARNING
The Series AFR Air Filter Regulator is intended for use in industrial
compressed air systems only. Do not use these products where
pressures and temperatures can exceed those listed under
specifications.
Before using these products with fluids other than air, for non-industrial
applications, life-support systems, or other applications not within
published specifications, contact Dwyer Instruments, Inc.
MAINTENANCE
To Remove Condensate
Slowly open drain valve and bleed accumulated liquid.
To Clean Filter Element
1) Shut off air supply.
2) Drain condensate.
3) Remove four corner bolts from bottom of unit.
4) Remove dripwell housing and filter.
5) Clean parts and reassemble in reverse order.
MAINTENANCE
Upon final installation of the Series AFR Air Filter Regulator, no routine
maintenance is required. A periodic check of the system calibration is
recommended. This Series AFR is not field serviceable and should be
returned if repair is needed (field repair should not be attempted and
may void warranty). Be sure to include a brief description of the problem
plus any relevant application notes. Contact customer service to receive
a return goods authorization number before shipping.
Figure 2
©Copyright 2014 Dwyer Instruments, Inc. Printed in U.S.A. 4/14 FR# RP-440986-00 Rev. 5
PROXIMITY CONTROLS
A DIVISION OF DWYER INSTRUMENTS, INC.
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A.
Phone: 219/879-8000 www.dwyer-inst.com
Fax: 219/872-9057 e-mail: info@dwyermail.com
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