■ CDS.951 Diaphragm Seal System for Pressure Gauges & Transmitters

-       Pressure gauge & pressure transmitter assembly type

-       Internal diaphragm with large working volume

-       Pressure range: -1…0 to 0…40 bar (system), up to 250 bar (flange rating)

-       Compatible with MAX / MBX gauges & EDA transmitters

-       Diaphragm seal protection for harsh media

 

■ Product Overview

CDS.951 is a diaphragm seal system designed for use with pressure gauges (MAX, MBX series) or pressure transmitters (EDA series), enabling reliable pressure measurement in demanding environments.

 

The internal diaphragm design with a large working volume ensures stable pressure transmission, while the screwed diaphragm seal construction allows easy maintenance and configuration flexibility.

 

It is suitable for aggressive, viscous, high-temperature, or crystallising media, protecting instruments and ensuring long-term stability.

 

■ Pressure Measurement Principle

Process pressure is applied to the diaphragm and transmitted to the pressure gauge or transmitter via the system fill fluid.

 

The diaphragm isolates the instrument from the process medium, ensuring accurate and reliable pressure transmission.

 

In gauges, pressure is indicated mechanically via a Bourdon tube, while in transmitters it is converted into an electrical signal.

 

■ Materials (Materials of wetted parts)

CDS.951 uses stainless steel 316L for all wetted parts, providing excellent corrosion resistance and durability.

 

Both the upper (instrument connection) and lower (process connection) parts are made of stainless steel 316L and support various flange standards.

 

The diaphragm is a high-sensitivity soft membrane type, tested with helium leak detection up to 10⁻⁹ mbar·l/s to ensure high sealing integrity.

 

Optional PTFE coating is available for enhanced resistance against aggressive media.

 

■ Accuracy Class

▶ MAX.51x / Class 1.0 (EN 837-1)

▶ MAX.41x / Class 1.6 (EN 837-1)

▶ MAX.31x / Class 1.6 (EN 837-1)

▶ MBX.51x / Class 1.0 (EN 837-1)

▶ MBX.31x / Class 1.6 (EN 837-1)

 

▶ EDA.370 / Class 1.0 F.S

▶ EDA.371 / Class 1.0 F.S

 

■ Applications

CDS.951 is designed for high-reliability measurement in demanding industrial environments and maintains stable performance under harsh conditions.

 

The diaphragm seal protects instruments from aggressive, viscous, and high-temperature media.

 

▶ Chemical & petrochemical industries

▶ Oil & gas industry

▶ Pharmaceutical & biotechnology industries

▶ Food & beverage industry

▶ Hydraulic & pneumatic systems

▶ Pumps & compressors

▶ General process industries

 

■ General Specification

Pressure ranges	-1…0 to 250 bar
Process connection	Flange, DIN EN 1092-1 ASME B16.5-2017 GOST 33259 API 6A JIS B2220
Filling liquid	Dry Glycerin Silicon Vegetable Oil [option] High Temp. Oil [option]
Mounting type	Direct (screwed type)
Temperature resistance	Medium temperature max. +250℃