Diaphragm Seal Assemblies with Capillary
Protective diaphragm seal systems designed to isolate instruments from corrosive, viscous, or high-temperature process media, improving measurement accuracy and extending instrument service life.
System Configurations
Standards & Compliance
Contact our engineering team for NACE compliance verification, material selection guidance, and custom configuration support.
Detailed Technical Specifications
| Parameter | Specification | Unit/Notes |
|---|---|---|
| Pressure Range | Full vacuum to 10,000 | PSI (higher ranges available) |
| Temperature Range | -40°C to +400°C | Process media temperature |
| Diaphragm Materials | 316L, Hastelloy C276, Inconel 625 | Other materials on request |
| Body Materials | 316L, Carbon steel, Alloy 20 | Various coating options |
| Process Connections | 1/2" to 2" NPT, 150# to 2500# flanges | RTJ, RF, FF flange faces |
| Capillary Length | Standard: 1-20 meters | Custom lengths available |
| Capillary OD | 1.5mm, 3mm, 4.5mm, 6mm | Stainless steel or armored |
| Filling Fluids | Silicone oil, glycerin, halocarbon | High-temp fluids available |
| Instrument Connection | 1/4" NPT, 1/2" NPT, G1/2 | Adapter kits available |
| Accuracy Impact | < 0.5% of span typical | Depends on configuration |
| Response Time | 50-500 ms typical | Depends on capillary length |
| NACE Compliance | MR0175/ISO 15156 | Materials and certification available |
Key Features & Benefits
Instrument Protection
Isolates sensitive pressure transmitters and gauges from corrosive, abrasive, or high-temperature process media, extending instrument life.
Improved Accuracy
Prevents process media from entering instrument sensing elements, maintaining measurement accuracy over time.
Premium Material Options
Available in SS316L for standard applications and Inconel 625 for extreme corrosion/temperature conditions.
Offshore Applications
Specifically designed for offshore oil & gas platforms, marine environments, and coastal installations.
Easy Maintenance
Diaphragm can be replaced without removing the entire assembly from the process, minimizing downtime.
Flexible Configuration
Capillary lengths up to 20 meters allow instrument mounting away from harsh process environments.
Industrial Applications
Diaphragm seal assemblies protect instruments in the most demanding industrial applications where process media would otherwise damage or clog sensing elements.
Wellhead Pressure Measurement
Protects instruments from H2S, CO2, sand, and high-pressure conditions in oil & gas production.
Corrosive Process Services
Acids, alkalis, chlorine, and aggressive chemicals in chemical processing plants.
High-Temperature Applications
Steam systems, hot oil circuits, and high-temperature process streams up to 400°C.
Viscous & Slurry Services
Prevents clogging in polymer production, food processing, and wastewater treatment.
Pharmaceutical & Food
Sanitary designs for hygienic applications with clean-in-place (CIP) capabilities.
Marine & Offshore
Saltwater environments, offshore platforms, and shipboard applications with marine-grade materials.
Technical Documentation
Download detailed specifications, material selection guides, and installation manuals.
Product Data Sheet
Complete technical specifications and selection guide
NACE Compliance Guide
Material selection for sour service applications
Installation & Maintenance Manual
Mounting, filling, commissioning, and maintenance procedures
Dimensional Drawings
2D & 3D CAD files for all standard configurations