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Mercoid - div. of Dwyer InstrumentsSeries A1 Low Cost Pressure Switch

A1S Series OEM Switch A1 with NEMA4X Enclosure
A1S Series OEM - Stainless Steel Diaphragm
A1 Series with NEMA4X Enclosure
Low Cost and Precision Made, The Al Pressure Switches are ideal for panel mounting wherever a high quality, economical open case control is required. Perfect for a wide range of applications in industrial service, the compact Series Al control is available with field adjustable operating ranges from as low as 2-20 psig up to 50-500 psig (14-140 kPa to 345-3450 kPa). A convenient indicating scale is included, allowing quick and easy field adjustment of the actuation point. The rugged Al construction incorporates the features most often requested by customers; a 316 stainless steel diaphragm pressure element for exceptional compatibility and long service life. Standard pressure chamber is aluminum with a Teflon® impregnated hard coating, perfect for oil based hydraulic fluids and non-corrosive air and gases. Choose optional 316 stainless steel for water or harsher applications. Optional weatherproof housings meet NEMA 4X standards.

Specifications

Maximum Pressure: 750 psig(51 bar) 
Temperature Limits: -40 to 180°F (-40 to 82°C) 
Mounting and Process Connections: 1/8" NPTF x 1/2" NPTM 
Switch Type: SPDT snap action, (3) screw terminals 
Electrical Ratings: 15A @ 120/240/480 VAC, 1/8 HP @ 125 VAC, 1/4 HP @ 250 VAC 
Setpoint Adjustment: Knurled screw cap (deadband is fixed) 
Chamber Material: Anodized aluminum standard, Optional 316 stainless steel 
O-Ring Material: Viton® (A1S)
Diaphragm: 316 stainless steel (A1S)
Installation: Within 20° of vertical 
Weight: 9 ounces (.25 kg) (A1S)
 A1 Series dimensions

Part Numbers

Model 
Number
(Buna-N Diaphragm)
Model Number
(Stainless Steel
Diaphragm)
 Set Point 
Range 
PSIG
Set Point 
Range
kPa
Deadband in 
PSIG (kPa) at 
Min/Max Set Point
A1S-O-AL-1-1 
A1S-O-AL-1-2 
A1S-O-AL-1-3 
A1S-O-AL-1-4		 A1S-O-AL-1-1
A1S-O-AL-1-2
A1S-O-AL-1-3
A1S-O-AL-1-4		 3-20 
15-150 
25-250 
50-500		 21-140 
103-1030 
172-1720 
345-3450		 1/3 (7/21) 
5/15 (34/103) 
8/25 (55/172) 
15/50 (103/345)

Options

Stainless Steel Pressure Chamber: Change "AL" in model number to "SS"
Polycarbonate Weatherproof Enclosure: Change "O" in model number to "PC"
Stainless Steel Weatherproof Enclosure: Change "O" in model number to "SC"
A-613 Mounting Bracket: Optional accessory provides rugged, permanent mounting and speeds installation for any A1 Switch

Contact Us!

John Sherman Agencies Ltd.
1641 Venables Street
Vancouver, British Columbia, Canada
V5L 2H1

Phone: 604-254-9622
Fax: 604-254-3123

e-mail: info@johnsherman.com

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Viton® is a registered trademark of DuPont Dow Elastomers
Teflon® is a registered trademark of DuPont