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NPA-Series NEMA 7 Pressure Switch

Brand: Ashcroft Inc
The Ashcroft® NPA Pressure Switch is housed in a NEMA 7/9 explosion proof enclosure to satisfy challenging applications needing high cycle rates with switch functionality.

This design incorporates proven thin film technology to trigger a high quality relay, making this an extremely reliable and long lasting switch.

This switch is ideal for use with pressure control, shutdown or alarm operations.

Specifications:
  • Accuracy: ±0.50% full scale
  • NEMA 3, 4, 4X, 7, 9 and 13 (IP66); aluminum enclosure
  • Single set point
  • Pressure ranges: 60 to 20,000 psi
  • Select process connections
  • Adjustable dead-band (as low as 0.5% of full scale)
Features
  • Multi-turn potentiometers allow easy setpoint and deadband adjustments 
  • Switch status indication 
  • SPDT 10 amp relay 
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The Ashcroft® NPA Pressure Switch is housed in a NEMA 7/9 explosion proof enclosure to satisfy challenging applications needing high cycle rates with switch functionality.

This design incorporates proven thin film technology to trigger a high quality relay, making this an extremely reliable and long lasting switch.

This switch is ideal for use with pressure control, shutdown or alarm operations.

Specifications:
  • Accuracy: ±0.50% full scale
  • NEMA 3, 4, 4X, 7, 9 and 13 (IP66); aluminum enclosure
  • Single set point
  • Pressure ranges: 60 to 20,000 psi
  • Select process connections
  • Adjustable dead-band (as low as 0.5% of full scale)
Features
  • Multi-turn potentiometers allow easy setpoint and deadband adjustments 
  • Switch status indication 
  • SPDT 10 amp relay 

Specifications

Accuracy

  • ± 0.4 % BFSL
  • ± 1.0 % of Full Scale Output

Adjustment Type

  • Factory Set (Pre-Set)
  • Field Adjustable

Burst Pressure

  • bar: 33.09 to 4,136
  • kPa: 3,309 to 413,685
  • psig: 480 to 60,000

Compensated Temperature

  • -29° to 71° C (-20° to 160° F)

Cone & Thread Connection

  • 1/4” AMINCO Female

Diaphragm Material

  • 630 Stainless Steel

Electrical Connectors

  • 3/4” to 1/2” Conduit Reducing Bushing
  • Left Side Conduit Connection

Electrical Rating

  • 10 A, 250 Vac, 10 A, 3 Vdc
  • 10 A, 250 Vac, 10 A, 30 Vdc, 4-20 mA

Enclosure, Body Material

  • Aluminum

Environmental Protection

  • IP54
  • IP66
  • NEMA 13
  • NEMA 3, 4, 4X, 7, 9, 13 / IP54, 66
  • NEMA 4
  • NEMA 4X
  • NEMA 7
  • NEMA 9

Hysteresis

  • ± 0.2 % of Span

Mounting

  • 2” Pipe Mounting Bracket

NPT Connection

  • 1/2” NPT Male
  • 1/4” NPT Female
  • 1/4” NPT Female & 1/2” NPT Male Combination
  • 1/4” NPT Male
  • 1/8” NPT Female
  • 1/8” NPT Male

O-Ring Material

  • 630 Stainless Steel

Operating Temperature

  • -28° to 82° C (-20° to 180° F)

Options

  • External Set Point Adjustment

Output

  • 4-20 mA

Power Requirement

  • 110 Vac, 50/60 Hz
  • 24 Vdc
  • 250 Vac, 50/60 Hz

Pressure Range

  • bar: 4.14 to 1,378
  • kPa: 413.7 to 137,895
  • psig: 60 to 20,000

Pressure Type

  • Gauge

Process Connection Material

  • 316 Stainless Steel

Proof Pressure

  • bar: 8.27 to 1,654
  • kPa: 827.37 to 165,474
  • psig: 120 to 24,000

Repeatability

  • ± 0.5 %
  • 0.07%

Response Time

  • ≤ 5 milliseconds

SAE Connection

  • 7/16”-20 SAE Male - 1/4” SAE Female

Set Point - Decreasing

  • bar: 4.137 to 1,379
  • kPa: 413.7 to 137,900
  • psig: 60 to 20,000

Set Point - Increasing

  • bar: 4.137 to 1,379
  • kPa: 413.7 to 137,900
  • psig: 60 to 20,000

Stability

  • ± 0.5 % of Full Scale Output/Year

Storage Temperature

  • -53° to 121° C (-65° to 250° F)

Supply Voltage

  • 36 Vdc (Unregulated)

Switch Type

  • SPDT

System Pressure

  • bar: 4.14 to 1,654
  • kPa: 413.7 to 165,474
  • psig: 60 to 24,000

Temperature Range

  • -28° to 82° C (-20° to 180° F)

Zero Offset

  • ± 1.0 of Full Scale