SENTINEL Diaphragm Seals ensure gauge and switch accuracy, smooth out erratic pressure surges, extend pressure instrumentation life, and protect gauges from freezing and slurries. Without proper protection, process fluids regularly contaminate and damage system instrumentation. SENTINEL Diaphragm Seals are guaranteed to protect and isolate all forms of system instrumentation from hazardous and corrosive process fluids for three (3) years.

	SENTINEL Diaphragm Seals protect and isolate all forms of system instrumentation from hazardous and corrosive process fluids. SENTINEL Flow Thru models prevent clogging of viscous fluids.

The diaphragm seal housing and the gauge Bourdon tube are filled at the factory when a diaphragm is purchased complete with gauge. These pre-assembled diaphragm seals are filled with glycerine, silicone, mineral oil, or halocarbon. Consult warning tag on diaphragm seal for type of body fill. Unassembled diaphragm seals (no fill without gauge) must be completely filled with a temperature stable liquid fill fluid. Glycerine, silicone, mineral oil or halocarbon are commonly used fill fluids. Additionally, the gauge or other pressure instrument must also be filled with the fill fluid. WARNING: Glycerine Glycerine or Silicone could result in a spontaneous chemical reaction or explosion when combined with strong oxidizing agents. Do not use glycerine or silicone filled gauges or accessories in these types of service.

	SENTINEL Diaphragm Seals are available for inlet ports from 1/4" (6.35mm) to 3/4" (19.05mm). Standard models are available in stock, with custom models available through special order. Models are available in a full range of chemically resistant materials.s.

	SENTINEL Diaphragm Seals are designed for pressure ranges up to 1000 psi (68.9 bar).

	SENTINEL Pressure Relief Valves are designed to protect pumping systems from over pressure damage caused by defective equipment or a blockage in the pump system line. SENTINEL Back Pressure Valves are designed to enhance the performance of pumping systems by applying a continuous back pressure to the system pump, while also acting as an anti-syphon valve.

	SENTINEL valves are available in sizes up to 3 inches (76.2 mm). Wetted materials include PVC, CPVC, PP, PVDF, PTFE, 316 SS, A 20 and Hastelloy C.

	SENTINEL Diaphragm Seals carry a three (3) year guarantee of performance. Certain limitations and restrictions apply. Refer to BLACOH's Manufacturer's Limited Warranty and Return Policy for complete details.