Overview

The document presents technical specifications and ordering information for the D712 series of flange diaphragm seals manufactured by Manfred Jünemann Mess- und Regeltechnik GmbH. These seals are designed for use with corrosive, contaminated, hot, and viscous media, serving as separators for pressure transmitters and pressure gauges. Special materials and designs are available for specific requirements.

Application and Purpose

• Used as chemical seals (flange diaphragm seals) to protect pressure measurement devices from aggressive, dirty, hot, and viscous fluids.
• Special materials can be selected for demanding applications.

Technical Specifications

• Pressure Range: 0.6 to 250 bar
• Diaphragm Material: Stainless steel 316L (1.4435)
• Flange Material: Stainless steel 316L (1.4404)
• Flange Standards: DIN EN 1092-1 (Form A/B1) or ASME B16.5 (Raised Face)
• Capillary Length: Standard 1.0 m; other lengths available (refer to page 06.1501)
• Filling Liquid: Silicone oils
• Temperature Range: -20°C to +200°C (special designs available for higher temperatures)

Product Variants and Dimensions

The D712 series includes types D712.0, D712.1, D712.2, and D712.3, each available in various nominal diameters (DN) and flange standards:

• DIN EN 1092-1: DN 15 to 125
• ASME B16.5: DN ½" to 4"

Each type has detailed dimensional data including flange diameter (D), bolt circle diameter (K), bolt hole diameter (d4), number and size of bolts (n x d2), flange thickness (b), diaphragm diameter (dm), sealing face (f), and mass (weight). The weight of the seal must be added to the basic weight of the pressure gauge.

Ordering Information

Each variant is identified by specific order numbers for different flange standards and sizes. The document provides comprehensive tables listing order numbers, dimensions, pressure ratings (PN or lb/sq.in.), and weights for each model and size.

Additional Notes and Options

• Special constructions are available for higher pressure and temperature ratings.
• Special materials for chemical seals can be ordered (see page 06.1501).
• Mounting options and systems are detailed on page 06.1502.

Summary

The D712 flange diaphragm seals are robust, versatile components designed to protect pressure measurement instruments in harsh industrial environments. Their compliance with international flange standards (DIN EN and ASME), availability in multiple sizes and pressure ratings, and options for special materials and designs make them suitable for a wide range of demanding applications.