Description of Diaphragm Seals, 34-ST-03-57

34-ST-03-57 Page 2

Description of Diaphragm Seals

Diaphragm seals are traditionally used when a standard pressure transmitter should not be exposed to the process pressure directly. Diaphragm seals typically protect the pressure transmitter from one or more damaging aspects of the process media. Consideration for using a diaphragm seal should be made in the following circumstances.

•High Process Temperature

•Process Media is Viscous or Contains Suspended Solids

•Process Media is Subject to Solidifying

•Process Media is Corrosive

•Process Application Requires Sanitary Connections

•Process Application Subjects the Measuring Instrument to Hydrogen Permeation

•Tank Level Applications with Maintenance Intensive Wet Legs

•Tank Application with Density or Interface Measurements

•Measuring Instrument Requires Remote Mounting

The following diaphragm seals are standard from Honeywell (please call your local salesperson if you do not see the product you need for your application):

Figure 2 - Flush Flange Seals can be used with differential, gauge and absolute pressure transmitters and are available with 3” ANSI Class 150, ANSI Class 300 and DIN DN80-PN40 process connections. Flush flange seals can also be provided with Lowers. Lowers are essentially calibration rings, which allow flushing connections if needed – see Figure 31.

Figure 2

Figure 3 - Flange Seal with Extended Diaphragm can be used with differential, gauge and absolute pressure transmitters and are available with 3” and 4” ANSI Class 150, ANSI Class 300, DIN DN80-PN40 and DIN DN100-PN40 process connections. 2”, 4” and 6” extension lengths are available.

Figure 3

Figure 4 - Pancake Seals can be used with differential, gauge and absolute pressure transmitters and are available with 3” ANSI Class 150, 300 and 600 process connections.

Figure 4

Figure 5 - Chemical Tee “Taylor” Wedge seals can be used with differential pressure transmitters and are available with Taylor Wedge 5” O.D. process connection.

Figure 5

STR94G, STR93D specifications

The Honeywell STR93D and STR94G are advanced temperature controllers designed for precision temperature management in a variety of applications, from industrial processes to HVAC systems. These intelligent devices are engineered to enhance efficiency, reliability, and user flexibility, catering to both simple and complex control scenarios.

The STR93D is characterized by its dual-channel capability, making it ideal for processes requiring simultaneous temperature monitoring and control. Its robust design ensures stable performance even in demanding environments. The controller features a user-friendly interface that includes a large, backlit display, allowing operators to easily navigate through menus and settings. The intuitive design simplifies the setup process, reducing installation time and minimizing user error.

On the other hand, the STR94G takes automation a step further with its advanced features and connectivity options. This model is equipped with a comprehensive set of control algorithms, including PID, on-off, and fuzzy logic controls, ensuring precise temperature regulation. The STR94G also supports multiple input types, such as thermocouples and RTDs, providing versatility across various applications.

Both models incorporate Honeywell's proprietary Smart Control technology, which optimizes energy consumption and enhances operational efficiency. This technology not only ensures accurate temperature management but also contributes to reduced operational costs by minimizing energy waste. Additionally, the controllers support communication protocols such as Modbus and BACnet, facilitating easy integration into existing systems and enabling remote monitoring capabilities.

Both controllers are built with durability in mind, featuring a rugged housing that protects against environmental factors, including dust and moisture. This makes them suitable for use in harsh industrial settings as well as in less demanding environments. Their adaptability and advanced technology provide users with solutions that not only meet but exceed industry standards.

In summary, the Honeywell STR93D and STR94G are exemplary temperature controllers that stand out in their field. They combine advanced control features, robust design, and exceptional connectivity, making them suitable for a wide range of applications. Whether for industrial use or commercial HVAC installations, these controllers deliver reliability and efficiency, setting a benchmark in temperature control solutions.

Honeywell STR93D, STR94G manual Description of Diaphragm Seals, 34-ST-03-57

Models: STR94G STR93D