Ashcroft NEMA 7 Pressure Switch, PP-Series
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PP-Series NEMA 7 Pressure Switch

Brand: Ashcroft Inc
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The Ashcroft® PP Pressure Switch was designed for use with harsh applications where uncompromising protection is required.

The features of this switch along with its proven technology provide a stable, long-lasting product; ideal for satisfying pressure control, shutdown or alarm operations.
Features
  • Explosion Proof Enclosure 
  • Dual chamber design allows for field calibration to be performed safely, even with power connected 
  • Wide selection of switch elements and wetted materials 
  • Process connection options available

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Specifications

Brand

Adjustment Type

  • Differential Pressure Control, Single Set Point, Adjustable Deadband
  • Differential Pressure Control, Single Set Point, Fixed Deadband
  • Differential Pressure Control, Two Independently Adjustable Set Points, Fixed Deadband
  • Factory Set (Pre-Set)
  • Field Adjustable
  • Pressure Control, Single Set Point, Adjustable Deadband
  • Pressure Control, Single Set Point, Fixed Deadband
  • Pressure Control, Two Independently Adjustable Set Points, Fixed Deadband

Ambient Temperature Range

  • -29° to 65° C (-20° to 150° F)

Approvals & Certifications

  • CE
  • CSA
  • Dual Seal
  • UL

Burst Pressure

  • bar: 2.41 to 965.26
  • kPa: 241 to 96,526
  • psig: 35 to 14,000

Burst Pressure - Compound

  • bar: 27.58
  • kPa: 2,758
  • psig: 400

Burst Pressure - Vacuum

  • bar: 27.58
  • kPa: 2,758
  • psig: 400

Compound Pressure

  • 30” Hg (-760 mmHg) at 15 psi

Deadband, Approximate

  • bar: 0.03 to 179.26
  • bar: 0.03 to 24.82
  • kPa: 3.44 to 2,482
  • kPa: 3.45 to 17,926
  • psid: 0.5 to 360
  • psig: 0.50 to 2,600

Deadband, Approximate - Compound

  • bar: 0.03 to 1.72
  • kPa: 6.98 to 172.36
  • psig: 1 to 25

Diaphragm Material

  • Buna-N
  • Monel
  • Stainless Steel
  • Teflon
  • Viton

Electrical - Free Leads

  • 6 Foot Leads on the Micro Switch

Electrical Connectors

  • 3/4” Sealed Conduit Connection with 16” Lead Wires
  • 3/4” to 1/2” Conduit Reducing Bushing
  • Terminal Block

Electrical Rating

  • 1/8 hp at 125 Vac/Vdc
  • 10 A at 125 Vac/Vdc
  • 11 A, 125/250 Vac, 5 A, 30 Vdc
  • 15 A, 125/250 Vac
  • 15 A, 125/250/480 Vac, 1/2 A, 125 Vdc, 1/4 A, 250 Vdc
  • 6 A at 30 Vdc

Element

  • Ammonia Service
  • Dual Elements
  • General-purpose
  • Heavy Duty AC
  • Heavy Duty DC
  • Hermetic Seal Switch, General-purpose
  • Hermetic Seal Switch, Narrow Deadband
  • Hermetic Seal, Gold Contacts
  • High Temperature 149° C (300° F)
  • Low Level (Gold Contacts)
  • Manual Reset on Decreasing Pressure
  • Manual Reset on Increasing Pressure
  • Narrow Deadband
  • Sealed Environment Proof

Enclosure, Body Material

  • Aluminum

Environmental Protection

  • IP66
  • NEMA 7, 9 / IP66
  • NEMA 9

Mounting

  • Top Mounting

NPT Connection

  • 1/2” NPT Female
  • 1/2” NPT Male
  • 1/4” NPT Female
  • 1/4” NPT Female & 1/2” NPT Male Combination

O-Ring Material

  • Buna-N
  • Monel
  • Stainless Steel
  • Teflon
  • Viton

Options

  • Chained Cover
  • Cleaned for Oxygen
  • Fire-Safe Actuator
  • Fungus Proofing
  • Stainless Steel Tags

Pressure Range

  • bar: 0.89 to 206.84
  • kPa: 7.45 to 20,684
  • psig: 1.08 to 3,000

Pressure Type

  • Differential
  • Gauge
  • Vacuum

Process Connection Material

  • 316 Stainless Steel
  • Epoxy Coated Carbon Steel
  • Nickel-Plated Brass

Proof Pressure

  • bar: 1.38 to 827
  • bar: 1.49 to 551.58
  • kPa: 137 to 82,737
  • kPa: 149 to 55,158
  • psid: 21.6 to 8,000
  • psig: 20 to 12,000

Proof Pressure - Compound

  • bar: 17.24
  • kPa: 1,723
  • psig: 250

Proof Pressure - Vacuum

  • bar: 17.24
  • kPa: 1,723
  • psig: 250

Repeatability

  • ± 1 % of Operating Range

Set Point - Decreasing

  • -30” Hg to 3,000 psig
  • bar: 0 to 206.8
  • Inches Hg: -30 to 0
  • Inches WC: 30 to 150
  • kPa: 0 to 20,680
  • psig: 0 to 3,000

Set Point - Increasing

  • -30” Hg to 3,000 psig
  • bar: 0 to 206.8
  • Inches Hg: -30 to 0
  • Inches WC: 30 to 150
  • kPa: 0 to 20,680
  • psig: 0 to 3,000

Static Pressure

  • bar: 0.37 to 68.95
  • kPa: 37.23 to 6,894
  • psid: 5.4 to 1,000

Switch Type

  • SPDT

System Pressure

  • bar: -1.02 to 551.58
  • Inches Hg: -30 to 0
  • Inches WC: 30 to 150
  • kPa: -100 to 82,737
  • psig: -14.73 to 12,000

Temperature Range

  • -17° to 148° C (0° to 300° F)

Vacuum Pressure

  • -30” Hg at -14.73 psig
  • bar: -1.02
  • kPa: -100

Documentation

Data Sheets

Installation & Maintenance

Product Information

Selection Guides

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