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S-Series (Vacuum, Differential) Pressure Switch

Brand: ASCO
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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 snapaction swtiches.

The electrical snap-action switch together with the adjusting mechanism is a fully-tested, self-contained subassembly.
Features
  • Set point repeatability, +1% of operating range.
  • All wiring terminals, adjustments and visual scales are accessible from the front of the switch.
  • Choice of general-purpose, watertight or explosion proof enclosures.
  • Choice of fixed or full-range adjustable deadband.
  • Choice of single or two-stage units.
  • Manual reset units available.
  • Mounts in any position.
  • Rugged and vibration resistant.
  • Visual adjustment scales in psi and bars.
  • External adjusting nuts.
  • Separate electrical, pressure and adjusting chambers.
  • Wide selection of transducer wetted materials suitable for air, water, oil or corrosive fluids.
  • Mix and match switch and transducer components for increased stock flexibility or to change pressure ranges in field.

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Specifications

Brand

Adjustment Type

  • Field Adjustable

Ambient Temperature Range

  • -20° to 60° C (-4° to 140° F)

Approvals & Certifications

  • CSA
  • UL

Diaphragm Material

  • Buna-N
  • Ethylene Propylene (EPR)
  • Fluorosilicone
  • Neoprene
  • Viton

Electrical Connectors

  • 3/4” NPT

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
  • 10 A at 125/250 Vac
  • 15 A at 125 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 to 1.034
  • Inches Hg: 0 to 30
  • Inches WC: 0 to 400
  • kPa: 0 to 103.4
  • psi: 0 to 15

Process Connection Material

  • 303 Stainless Steel
  • 316 Stainless Steel
  • Aluminum
  • Brass

Proof Pressure

  • bar: 1.034 to 3.447
  • kPa: 103.4 to 344.7
  • psig: 15 to 50

Set Point - Decreasing

  • bar: 0 to 27.58
  • Inches Hg: -30 to 0
  • kPa: 0 to 2,758
  • psi: 0 to 400

Set Point - Increasing

  • bar: 0 to 27.58
  • Inches Hg: -30 to 0
  • kPa: 0 to 2,758
  • psi: 0 to 400

Standard Features

  • Explosion-proof
  • General-purpose
  • Watertight

Switch Type

  • SPDT

System Pressure

  • bar: 1.034 to 3.447
  • kPa: 103.4 to 344.7
  • psig: 15 to 50

Documentation

Data Sheets

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