Installation . . .
Install AFS models in piping system using standard pipe fitting procedures. Be
sure to keep thread sealing compound out of unit. Install so that flow is in proper
direction (marked "IN" and "OUT" on housing). Use of 50 micron filtration is
recommended.
Piston-Type Flow Switches
AFS Series
Electrical Data . . .
Typical Wiring Diagram . . .
3-Pin Receptacle
Amps AC
.4
.17
.08
Amps DC
.3
.13
.06
Volts
0-30
120
240
VA
Switch Ratings - Max Resistive Load
20
*Minimum line pressure for positive actuation.
15% Max.
Housing
Piston
(In Brass Housing)
Piston (SS Housing)
Other Wetted Parts
Operating
Proof
Burst
With SS or Brass Piston
With Polysulfone Piston
For 5 PSIG Line*
For 100 PSIG Line
Materials
Liquid Flow Adjustable Range - Water
Pressure
Ratings
Operating
Temperatures
-20
o
to +300
o
F(-29
o
C to +148.9
o
C)
-20
o
to +225
o
F(-29
o
C to +107.2
o
C)
Repeatability
1% Max. Deviation
Set Point Differential
Set Point Accuracy (Constant Temperature)
Factory-Set (Standard)
±10% Max.
Switch (See Electrical Data, Below)
SPDT, 20 VA
Lead Wires
No. 18 AWG, 24" L., Polymeric
Specifications . . .
Air/Gas Flow Adj. Ranges:
(Dep. on Oper. Line Pressure)
Note: Temperature changes will slightly affect water or gas flow settings.
Oil settings will vary with viscosity.
Brass or 316 SS
Polysulfone for Water
Brass for Oil or Air
316 SS
316 SS, Viton, Epoxy
0.5 to 20 GPM
1000 PSIG
2500 PSIG
5000 PSIG
For 100 PSIG Line: 3 to 160 SCFM Approx.
For 5 PSIG Line*: 1 to 75 SCFM (Approx.)
A
C
Red
Black
Orange
B
DWYER INSTRUMENTS,INC.
P.O.BOX 373 MICHIGAN CITY, INDIANA 46361, U.S.A.
Phone: 219/879-8000
Fax: 219/872-9057
Lit-By Fax: 888/891-4963
www.dwyer-inst.com
Important Points!
Product must be maintained and installed in strict accordance
with the National Electrical Code and Dwyer product catalog
and instruction bulletin. Failure to observe this warning could
result in serious injuries or damages.
For hazardous area applications involving such things as (but
not limited to) ignitable mixtures, combustible dust and
flammable materials, use an appropriate explosion-proof
enclosure or intrinsically safe interface device.
The pressure and temperature limitations shown on the
individual catalog pages and drawings for the specified flow
switches must not be exceeded. These pressures and
temperatures take into consideration possible system surge
pressures/temperatures and their frequencies.
Selection of materials for compatibility with the media is critical
to the life and operation of Dwyer products. Take care in the
proper selection of materials of construction, particularly wetted
materials.
Life expectancy of switch contacts varies with applications.
Contact Dwyer if life cycle testing is required.
Ambient temperature changes do affect switch set points,
since the specific gravity of a liquid can vary with temperature.
Dwyer Products have been designed to resist shock and
vibration; however, shock and vibration should be minimized.
Filter liquid media containing particulate and/or debris to
ensure the proper operation of our products.
Electrical entries and mounting points in an enclosed tank
may require liquid/vapor sealing.
Dwyer Products must not be field-repaired.
Physical damage sustained by the product may render it
unserviceable.
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