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SPS Secondary Process Seal Assemblies

The secondary process seal assembly with rupture indication sensor is designed to prevent the passage of gases under pressure through conduit, cables and conductors, while providing immediate notification of a dangerous, potentially explosive seal rupture.  These assemblies are ideal where volatile liquids or gases are stored, processed or transported under pressure.  If the primary seal in an instrument should fail, the secondary process seal will prevent gases, vapors and liquids from migrating into the non-classified location through the electrical system.

The secondary process seal features a rupture indication sensor that opens safely at 60 PSI minimum and activates a circuit to a control system or alarm, which immediately alerts maintenance personnel that the primary seal has ruptured.  The location of the problem can be pinpointed so the problem can be quickly addressed.

Certifications and compliances

  • Class I, Divisions 1 & 2, Groups B, C, D
  • Class I, Zones 1 & 2, IIB + H2
  • Class II, Divisions 1 & 2, Groups E, F, G
  • CSA and CSAus certified
  • NEMA 3, 4, 7BCD, 9

Design features

Secondary process seal:

  • Meets or exceeds ANSI / ISA / CSA / CEC / NEC / API requirements for a secondary process seal and explosionproof conduit seal
  • Sealed to 1500 PSI; operates in any position
  • Simplified design allows for easier installation in new and existing applications
  • Integrated packaging contains all necessary components for installation
  • Explosionproof drain allows for the safe release of gas, vapor or liquid from the electrical system to meet required codes
  • Explosionproof terminal box features a simple design to provide access for quick connection of circuits
  • Assembly with drain provides local “make obvious” indication of primary seal failure

Rupture indication sensor:

  • Rupture detection and indication at 60 PSI
  • Provides remote, immediate notification of a seal rupture, allowing for maintenance to quickly address the problem and isolate safety concerns
  • Stainless steel construction provides superior corrosion resistance and durability
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