ABB S26RAHG1SFTM2BJGNN S26R Remote Diaphragm Seal

ABB S26RAHG1SFTM2BJGNN Product Overview

The ABB S26RAHG1SFTM2BJGNN belongs to the S26 series of diaphragm seals developed for ABB industrial pressure measurement systems. ABB describes the S26 line as a family of remote and direct-mount seals for pressure transmitters. The product line is designed to extend the application range of pressure measurement instruments when direct exposure of the transmitter sensing connection to the process is not appropriate.

The S26R designation identifies a particular remote diaphragm seal configuration within the S26 family. A remote seal places the process diaphragm at the process connection while the pressure transmitter is connected to the seal through a pressure transmission system. This construction provides physical separation between the process medium and the transmitter sensing mechanism.

The complete ordering code S26RAHG1SFTM2BJGNN identifies a specific configuration of the S26R product. Because ABB offers numerous combinations of process connections, materials, fill systems and other options within the S26 family, the complete ordering code should be retained when identifying the product.

Product Specifications

Remote Diaphragm Seal Function

A diaphragm seal is used when the pressure transmitter needs to be isolated from direct contact with the process medium. Instead of allowing the process fluid to enter the transmitter pressure connection, the process pressure acts on a flexible diaphragm at the seal.

The pressure applied to the diaphragm is transferred through the internal fill system to the pressure sensing element of the connected transmitter. In this way, the transmitter can measure the process pressure while remaining separated from the process fluid.

This design can be particularly useful in applications involving difficult process media, elevated temperatures, corrosive substances, viscous materials or processes where a specialized process connection is required. The appropriate seal configuration depends on the process conditions and the selected transmitter.

S26R and ABB 266 Pressure Transmitters

ABB’s S26 line is closely associated with the 266 pressure transmitter family. ABB states that the S26 line, together with the 266 pressure transmitter family, supports gauge, absolute and differential pressure measurement applications.

The combination of a pressure transmitter and remote diaphragm seal creates a measurement system in which the seal provides the process interface and the transmitter provides the pressure sensing and signal-processing functions. This modular arrangement allows the pressure measurement system to be adapted to different process installation requirements.

The S26R seal should therefore not be regarded as a standalone electronic pressure transmitter. It is a process interface component intended to operate together with a compatible pressure measurement instrument.

Applications in Industrial Process Measurement

Remote diaphragm seals are commonly used in industrial process measurement where direct pressure connection is unsuitable. The S26 family provides different seal configurations so that the process connection can be matched to the installation requirements.

In liquid level measurement, a remote diaphragm seal can be installed on a process vessel and connected to a pressure transmitter. The seal transfers the pressure generated by the process liquid to the transmitter while separating the transmitter from direct exposure to the liquid.

In flow measurement systems, differential pressure transmitters can use remote seals where process conditions require diaphragm isolation. The pressure difference between the relevant process points can be transmitted to the connected pressure transmitter through the remote seal arrangement.

Remote seals can also be used in pressure measurement systems where the process connection needs to be physically separated from the transmitter body. The final application depends on the transmitter model, seal configuration and process conditions.

Process Isolation

One of the primary functions of a remote diaphragm seal is process isolation. The process medium contacts the diaphragm at the seal rather than entering the transmitter sensing connection directly.

This arrangement can provide an important barrier between the process and the pressure transmitter. The diaphragm material and internal fill system must be appropriate for the process because they directly influence the pressure transmission characteristics of the measurement system.

ABB documentation emphasizes the importance of checking wetted-material compatibility before installation. The diaphragm seal should be selected according to the process fluid, temperature, pressure and other relevant environmental conditions.

Installation Considerations

Correct installation is important for remote diaphragm seal systems because mechanical installation can directly affect measurement performance. The seal must be correctly positioned against the process connection, and the required gasket or sealing arrangement must be installed correctly where applicable.

ABB installation documentation specifically lists S26R among the diaphragm seal models that require attention to gasket selection and positioning. An unsuitable gasket or incorrect installation can interfere with the diaphragm and affect measurement performance.

Flanged and other seal configurations also require appropriate bolt tightening procedures. The exact installation requirements depend on the specific S26 configuration and process connection.

Vacuum Measurement Considerations

Remote diaphragm seal systems may also be used in applications operating below atmospheric pressure. Vacuum service requires special consideration because the fill fluid and transmitter installation arrangement can influence the measurement system.

ABB’s operating instructions recommend checking the fill-fluid characteristics and temperature limits for applications operating below atmospheric pressure. The relative elevation of the transmitter and process connection should also be considered during installation.

These considerations demonstrate why the complete S26 configuration is important. The seal type, fill system, capillary arrangement and installation position work together as part of the overall pressure measurement system.

Construction and Configuration Flexibility

The ABB S26 line includes a wide range of process connection arrangements. ABB provides different seal designs for different industrial requirements, allowing the pressure measurement system to be adapted to the physical characteristics of the process.

The S26 family includes configurations such as threaded, flanged, wafer, sanitary and other specialized seal arrangements. S26R is one of the remote seal configurations within this broader product family.

This configuration flexibility is important when designing process instrumentation because a pressure transmitter cannot always be connected directly to the process. A remote seal can provide the necessary mechanical and process interface while maintaining the pressure measurement function of the connected transmitter.

Identification of S26RAHG1SFTM2BJGNN

The full code S26RAHG1SFTM2BJGNN should be used when documenting this specific product. The first part of the designation identifies the S26R remote diaphragm seal family, while the remaining characters represent configuration information.

ABB product coding can include multiple configuration fields within a single ordering designation. For procurement, maintenance and replacement purposes, shortening the code may result in an incorrect seal configuration being selected.

The most reliable identification method is therefore to record the complete product code from the nameplate or product documentation. If the S26 seal is supplied together with an ABB 266 transmitter, the transmitter’s complete model code should also be recorded separately.

Key Features of ABB S26RAHG1SFTM2BJGNN

• ABB S26 series remote diaphragm seal configuration
• S26R remote seal design
• Designed for compatible ABB pressure transmitters
• Associated with ABB 266 pressure transmitter systems
• Provides process isolation through a diaphragm interface
• Supports pressure measurement system configurations
• Suitable for gauge, absolute and differential pressure applications when matched with the appropriate transmitter
• Available in multiple process connection and configuration options across the S26 family
• Complete ordering code identifies the specific configuration
• Designed for industrial process measurement installations

Conclusion

ABB S26RAHG1SFTM2BJGNN is an S26R remote diaphragm seal configuration within ABB’s S26 pressure measurement seal family. The S26 line is designed to work with compatible ABB pressure transmitters and provides a process-side diaphragm interface that separates the transmitter from direct contact with the process medium.

The S26R concept is particularly useful when pressure measurement requires process isolation, specialized connections or additional installation flexibility. It can be integrated with compatible ABB 266 pressure transmitters for gauge, absolute or differential pressure measurement applications.

Because S26 products are available in numerous configurations, the complete S26RAHG1SFTM2BJGNN designation should be retained when identifying the product. The exact configuration should be verified from the product nameplate and applicable ABB documentation before selecting a replacement or defining process installation parameters.