Description
ASCO S-Series pressure switches consist of a switch unit and a transducer unit. They can be ordered separately for customer stocking and/or field assembly or as a complete factory-assembled unit.
Switch
S-Series pressure switch units incorporate the unique ASCO TRI-POINT alternating fulcrum balance plate to control the operation of one or more electrical snap- action swtiches.
The electrical snap-action switch together with the adjusting mechanism is a fully-tested, self-contained subassembly.
Transducer
Transducer unit incorporates a diaphragm/piston type pressure sensor, and is also a fully-tested, self-contained subassembly.
Features- Set point repeatability, +1% of operating range.
- UL Listed in the gas and oil equipment list.
- FM Approved as “pressure supervisory switches.”
- Externally visible pressure setting scales.
- External adjusting nuts.
- Choice of fixed or full-range adjustable deadbands.
- Choice of single or two-stage units.
- Mounts in any position.
- Rugged and vibration resistant.
- Separate electrical, pressure and adjusting chambers.
- Mix and match switch and transducer components for increased stock flexibility or to change pressure ranges in field.
- Withstands high surge pressures.
Configure
Specifications
Specifications
Brand
Adjustment Type
- Field Adjustable
Ambient Temperature Range
- -20° to 60° C (-4° to 140° F)
Approvals & Certifications
- FM
- UL
Diaphragm Material
- Buna-N
- Ethylene Propylene (EPR)
- Fluorosilicone
- Neoprene
- Viton
Electrical Contacts
- Gold
Electrical Rating
- 1/2 A at 125 Vdc
- 1/4 A at 250 Vdc
- 1/4 hp at 250 Vac
- 1/8 hp at 125 Vac
- 5 A at 125/250 Vac
Enclosure, Body Material
- 316 Stainless Steel
- Aluminum
NPT Connection
- 1/2” NPT Female
- 1/4” NPT Female
O-Ring Material
- Buna-N
- Ethylene Propylene (EPR)
- Fluorosilicone
- Neoprene
Pressure Range
- bar: 0.028 to 6.895
- Inches WC: 0 to 400
- kpa: 2.758 to 689.5
- psig: 0.4 to 100
Process Connection Material
- 303 Stainless Steel
- 316 Stainless Steel
- Aluminum
- Brass
Proof Pressure
- bar: 1.034 to 13.79
- kpa: 103.4 to 1,379
- psig: 15 to 200
Set Point - Decreasing
- bar: 0.027 to 6.894
- Inches WC: 0 to 400
- kPa: 2.757 to 689.4
- psi: 0.4 to 100
Set Point - Increasing
- bar: 0.027 to 6.894
- Inches WC: 0 to 400
- kPa: 2.757 to 689.4
- psi: 0.4 to 100
Standard Features
- Watertight
Switch Type
- SPDT
System Pressure
- bar: 1.03 to 13.79
- kPa: 103.4 to 1,379
- psig: 15 to 200