SENTINEL™ Diaphragm Seals
Isolate & Protect Process System Instrumentation

Without proper protection, process fluids regularly contaminate and damage inline instrumentation. SENTINEL Diaphragm Seals, also referred to as gauge guards or gauge isolators, employ a chemically resistant diaphragm to isolate and protect system instrumentation from corrosive process fluids, freezing and slurries.

  • Wide variety of gauge options with gauge accuracy of +/- 2% or better full deflection
  • Models available with no gauge, custom fills, and factory installed instrumentation provided by customer
  • Housings are unconditionally guaranteed for life not to fail or Blacoh will replace them at no cost
  • Easily installed, come in a variety of chemically resistant materials, and work in both pressure and vacuum conditions
  • Protect gauges and other system instrumentation from process fluid contamination and corrosion.
  • Accurately transfer process pressure without direct contact with process fluids.
  • Prevent erratic surges and clogging due to solids in process fluids.
  • Protect gauges from freezing and slurries.
  • Ensure accuracy and reliability of pressure instrumentation when working with corrosive or solids-laden fluids.
  • Reduce costs by replacing expensive gauges with low cost utility gauges.
  • Proudly made in the USA

HOUSING MATERIALS: CPVC, Polypropylene, PVC, PVDF, Alloy 20, Stainless Steel
BLADDER MATERIALS: EPDM, PTFE, Viton
INLET SIZES: 0.25" (8mm), 0.5" (15mm), 0.75" (20mm)
INLET TYPES: FNPT, BSP, ANSI Flange, Socket Weld, Tri-clamp, Union
MAX PRESSURE: 200 psi (13.7 bar), PVDF 250 psi (17.2 bar), METAL 1000 psi (68.9 bar)
CERTIFICATIONS & TESTING: NSF, ARRA, 3.1 Cert, Cert of Origin

MODEL NUMBER FORMAT

Example model number:

Series Wetted/Nonwetted
CPVC CPVC
PP Polypropylene
PVC PVC
PVDF PVDF
A20 Alloy 20
SS Stainless Steel