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Qualitrol Rapid Pressure Rise Relay, 900/910

900/910 Rapid Pressure Rise Relay

Brand: Qualitrol Company
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Qualitrol Rapid Pressure Rise Relay, 900/910
Patented mechanical device for detection of sudden pressure events based on the rate of pressure rise and safe limits established by transformer manufacturers.

When a dangerous pressure rise has been detected, the Qualitrol rapid pressure rise relay (RPRR) will change state.

This can be used as an alarm or trip signal to minimize the potential of transformer tank damage.
Features
  • Models designed for use in oil or gas space
  • 100% tested for pressure rate release point
  • Protection and detection of dangerous sudden pressure changes
  • Devices calibrated to quickly alarm or trip during rapid pressure rise changes
  • Actuation only occurs based on rate of pressure rise and will not occur under normal pressure variations caused by temperature change and vibration
  • Can be subjected to full vacuum or 20 psi positive pressure without damage
  • Standard operation from -40° to 82°C (-40° to 180° F)
  • Special units available for operation at -55° C (-67° F)
  • 100% factory calibrated and tested to ensure performance
  • Units are serialized and calibration records maintained
  • Factory tested for switch (contact) performance and response
  • Field test kit available for simple GO/NO-GO test to assure proper functionality of the device
  • Multiple mounting and calibration options for gas or oil applications
  • Flange or thread mounting options available for vertical or horizontal mounting
  • Models calibrated for proper response in gas or oil space applications
  • From the original creator of mechanical rapid pressure rise relays
  • Original creator of patented bellows technology for mechanical rapid pressure rise detection
  • Over 25 years of experience and refinement in rapid pressure rise protection with greater than 100,000 units installed

Specifications

Brand

Ambient Operating Temperature

  • -40° to 82° C (-40° to 180° F)

Bleed Valve Material

  • Nickel-Plated Brass

Electrical Connectors

  • ANSI Style Circular 3-Pin
  • Flying Leads or Terminal Box
  • Military Spec MS3102E16-10P Circular 3-Pin
  • QUALITROL Style Circular 3-Pin

Finish

  • Thermosetting Powder Coat (ANSI # 70 Gray)

Flange Mount Dimension

  • Four 1/2” Diameter Bolt Slots Equally Spaced on a 4” Bolt Circle

Hardware Material

  • Stainless Steel

Housing, Cover

  • Die Cast Aluminum

Maximum Pressure

  • psig: 14.7 to 20 (kPa: 100 to 140, bar: 1.0 to 1.4) (Sensing Bellows)

Mounting

  • Vertical or Horizontal in Gas or Oil Mediums

Mounting Style

  • Flange Mount
  • Thread Mount

O-Ring Seal Material

  • Viton

Resistance to Vibration

  • Switch Operation Not Affected when Subjected to 50/60 Hz, or Whole Multiples Thereof

Switch Rating

  • 1/2 A at 125 Vdc, Resistive
  • 1/4 A at 250 Vdc, Resistive
  • 10 A at 125, 250 & 480 Vac

Switch Type

  • Snap-Action, SPST or SPDT

Thread Mount Dimension

  • 2-1/2”-8 NPT Tapered Pipe Male Thread with 3” Hex Wrench Flat

Vent

  • Brass
  • Copper

Documentation

Data Sheets

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