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S-Series Combustion Switch

Brand: ASCO

ASCO S-Series combustion 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 combustion 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

Specifications

Brand

Diaphragm Material

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

Ambient Temperature

  • -20° to 60° C (-4° to 140° F)

Proof Pressure

  • bar: 1.034 to 13.79
  • kpa: 103.4 to 1,379
  • psig: 15 to 200

NPT Connection

  • 1/2" NPT Female
  • 1/4" NPT Female

Standard Features

  • Watertight

Approvals & Certifications

  • FM
  • UL

Pressure Range

  • bar: 0.028 to 6.895
  • inH₂O: 0 to 400
  • kpa: 2.758 to 689.5
  • psig: 0.4 to 100

Set Point - Increasing

  • bar: 0.027 to 6.894
  • inH₂O: 0 to 400
  • kPa: 2.757 to 689.4
  • psi: 0.4 to 100

Set Point - Decreasing

  • bar: 0.027 to 6.894
  • inH₂O: 0 to 400
  • kPa: 2.757 to 689.4
  • psi: 0.4 to 100

Enclosure, Body Material

  • 316 Stainless Steel
  • Aluminum

Process Connection Material

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

Electrical Rating

  • 1/2 A Res. at 125 Vdc
  • 1/4 A Res. at 250 Vdc
  • 5 A Res.at 125/250 Vac
  • 1/4 hp at 250 Vac
  • 1/8 hp at 125 Vac
  • 0.4 A Res. at 125 Vdc

Switch Type

  • SPDT

Documentation

Data Sheets

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