■ CDS.911, Threaded Diaphragm Seal (Internal Diaphragm Type)

• All stainless steel body & internal diaphragm
• Threaded diaphragm seal (direct / capillary type)
• Nominal pressure up to 40 bar
• Dry type or various filling liquids (Options include glycerine, silicone and vegetable oil)
• Capillary connection [option]

 

■ Product Overview

The CDS.911 series is a screw-type diaphragm seal featuring an internal diaphragm structure, designed to isolate the process fluid from the pressure measurement equipment to protect the equipment.

All wetted parts are made of 316L stainless steel, providing excellent corrosion resistance and enabling stable operation in various process environments, including corrosive, viscous, and high-temperature fluids.

It is used in combination with pressure gauges (MAX, MBX series) or pressure transmitters (EDA.370, EDA.371), preventing direct contact between the process fluid and the measuring equipment to extend equipment lifespan and ensure measurement reliability.

Options include dry-type or various system fill fluids, and capillary connection options allow for adaptation to a wide range of installation conditions.

 

■ Principles of Pressure Measurement

The CDS.911 diaphragm seal transmits process pressure via an internal metal diaphragm.

The pressure of the fluid deforms the diaphragm, and this deformation is transmitted to the pressure gauge or transmitter via the internal filling fluid or a direct connection structure.

This design ensures stable pressure transmission while protecting the measuring equipment from direct exposure to corrosive, high-temperature, or viscous fluids.

 

■ Materials of wetted parts

All fluid-contacting parts are made of 316L stainless steel, providing excellent corrosion resistance against most industrial fluids.

 

For special environments, Teflon coating or other specialized materials can also be applied.

■ Accuracy class

The CDS.911 is a sealed product rather than a self-contained measuring device, and its accuracy depends on the precision of the pressure gauge and transmitter with which it is paired.

▶ Pressure Gauge

• MAX series: Class 1.0 / 1.6 (EN 837-1)
• MBX series: Class 1.0 / 1.6 (EN 837-1)

▶ Pressure Transmitter

• EDA.370 / EDA.371: Class 1.0 F.S

 

 

■ Configuration & Options

▶ Direct mounting

▶ Capillary connection (SUS protection / PVC coating options)

▶ Dry or filled (GL, SI, VO, HT, etc.)

▶ Teflon-coated diaphragm [optional]

▶ Oil-free (for oxygen) [optional]

▶ Restrictor (pulsation pressure protection) [optional]

▶ Various calibration certificates (KOLAS, etc.)

 

 

■ Industries of Application

Used to protect measuring equipment from process fluids in a wide range of industrial environments.

▶ Chemical and process industries

▶ Food and beverage industries

▶ Pharmaceutical and biotechnology industries

▶ Processes involving viscous or solidifying fluids

▶ Steam and high-temperature fluid environments

▶ Facilities subject to pressure pulsations and significant pressure fluctuations.

 

■ Features

▶Separate structure for process fluid and measuring equipment

▶Stable pressure transmission via internal diaphragm design

▶Suitable for viscous, corrosive and high-temperature fluids

▶Compatible with a wide range of pressure gauges and transmitters

▶Choice of various filling fluids and options

 

■ General Technical Specifications

Pressure ranges Nominal pressure	-1…0 to 40 bar PN 100
Temperature resistance	Max. +250℃ (with cooling device option up to 300℃)
Process connection	Threaded (G, PT type)
Filling liquid	Glycerin / Silicon / Vegetable oil / High temp oil
Mounting type	Direct / Capillary
Diaphragm type	Internal diaphragm (stainless steel 316L)