A remote seal system consists of the following components.

• Pressure transmitter
• One or two remote seals
• Filling liquid
• Connection between the pressure transmitter and remote seal (direct mounting or via a capillary)

The space for the measured medium is sealed off with a flat embedded elastic diaphragm. Between the diaphragm and the pressure transmitter is the filling liquid.

In many cases, a capillary must be connected between the remote seal and the pressure transmitter in order, for example, to reduce the temperature effects on the pressure transmitter when the measured medium is hot.

However, the capillary influences the activation time and the temperature response of the overall remote seal system. When capillaries are used to connect a remote seal to a pressure transmitter for differential pressure, two capillaries of equal length must always be used.

Optionally, the remote seal with diaphragm extension (tube) can be ordered.

The remote seals in sandwich design are secured with a blank flange.

Designs

Diaphragm seal

With diaphragm seals, the pressure is sensed by a flat embedded diaphragm.

Diaphragm seals are differentiated as follows:

Diaphragm seal in sandwich design without (left) and with diaphragm extension (tube)

• Sandwich design
• Sandwich design with diaphragm extension (tube) according to EN or ASME and secured with a blank flange

Diaphragm seal in flange design without (left) and with diaphragm extension (tube)

• Flange design
• Flange design with diaphragm extension (tube) according to EN or ASME and secured using holes on the flange

Quick-release diaphragm seal

• Remote seal with quick release, e.g., according to DIN 11851, SMS Standard, IDF Standard, APV-RJF Standard, clamp connection, etc.
• Miniature remote seal with male thread for screwing into threaded holes
• Remote seal with customer-specific process connections

Miniature diaphragm seal with flush-mounted diaphragm

• Miniature diaphragm seal

Remote seals with quick release are used mainly in the food industry. They are designed to prevent the measured medium from depositing in dead spaces. The remote seal's quick release mechanism enables fast disassembly for cleaning.

Clamp-on seal

Clamp-on seal with quick release (left) and for flange mounting

With clamp-on seals, the pressure is sensed using a cylindrical diaphragm inside the pipe and then transmitted with the filling liquid to the pressure transmitter.

The clamp-on seal is a special design for flowing media. It consists of a cylindrical pipe in which a cylindrical diaphragm is embedded. Because it is completely integrated in the process line, there are no turbulences, dead spaces or other obstacles in the flow direction. The clamp-on seal is also piggable.

Clamp-on seals are differentiated as follows:

• Clamp-on seal with quick release, e.g., according to DIN 11851, SMS Standard, IDF Standard, APV/RJF Standard, clamp connection, etc. The remote seal's quick release mechanism enables fast disassembly for cleaning.
• Clamp-on seal for flange mounting according to EN or ASME
• Clamp-on seal with customer-specific process connections

Note:

The pressure information on the transmitter and the remote seal must be observed in accordance with the pressure-temperature relationship.