Understanding Transmitter Seals Webinar

What Do I Need to Know?

Understanding Transmitter Seals

Tonya Miller & Liz Majestic

November 17, 2016

Host: Kristina NeahrMarketing Specialistkristina.neahr@us.yokogawa.com

Presenter 1: Tonya MillerTechnical Support Specialistsupport@us.yokogawa.com

Presenter 2: Liz MajesticApplication Engineersupport@us.yokogawa.com

Host & Presenters

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Event Logistics

1. What is a diaphragm seal system?2. How a diaphragm seal system works3. Direct mount vs. capillary mount4. When to use a diaphragm seal system5. Performance considerations6. Advantages & limitations

What is a Diaphragm Seal System?

Consists of a transmitter, a process connection, and a capillary connecting the two.

Transmitter: Measures and converts the measured variable to a signal to be transmitted.

Capillary: Connects the seal to the transmitter and contains the fill fluid.

Process Connection: The part that is in contact with the process. and is available in a host of sizes, types, flange ratings, and wetted materials.

What is a Diaphragm Seal System?

How a Diaphragm Seal System Works

Instrument (such as a pressure transmitter) mounted- directly or by means of a capillary or cooling element.

A diaphragm within the seal system separates the transmitter from the process medium. Any part of the diaphragm seal (i.e. diaphragm, lower housing, gaskets) which will be exposed to the process medium is selected from materials resistant to pressure, temperature and possible chemical attack by the process medium.

The diaphragm seal is also filled with a transmitting or system fill fluid. Pressure applied by the process medium to the seal diaphragm is hydraulically transmitted to the pressure element of the transmitter, generating a pressure reading.

Principle of HydraulicsMechanically transfers the force applied at the process

diaphragm to the transmitter diaphragm. Fill fluid is a non-compressible liquid compatible with the

process temperature and pressure. Basically- the process pressure is transmitted to the

transmitter via the fill fluid.

Accuracy & Response Time

System Accuracy & Response Time ≠

Transmitter Accuracy & Response Time

Remember:System Accuracy = Transmitter Accuracy + Capillary/Diaphragm Seal Accuracy

System Response Time = Transmitter Response + Capillary/Diaphragm Response

Direct vs. Capillary Mount

Direct MountSeal is attached as an integral (close

coupled) part of the transmitter body

Capillary MountRemote mounted diaphragm seal process

connection with a capillary between the seal & transmitter

Direct vs Capillary Mount

Connection system to mount various types of seals directly to a transmitter.

Eliminates capillaries, improving the overall temperature effect.

Reasons to use a Direct Mount System:Level measurementsFlexibility in applicationsWhen close connection to tank is requiredSanitary applications where capillaries are not

recommended

Direct Mount

A remote diaphragm seal system offers a cost effective means of preventing the process medium from coming in contact with a transmitter.

Reasons to use a Remote Mount System:High temperaturesCorrosive serviceSafetyPrevent clogging of cell body or impulse linesSanitary requirementsReplacement of wet legsAvoid contamination

Capillary (Remote) Mount

When to Use a Diaphragm Seal System

A transmitter alone is not always the solution Typical conditions:

Process temperatures beyond the limits of the transmitterSpecial process connections (sanitary connections, PMC

connections, quick disconnect)Presence of solids or viscous fluids Process is corrosive Hydrogen PermeationReplacement of inefficient wet legs

When to Use a Diaphragm Seal System

Performance Considerations

Maximum process and ambient temperature changes How quickly will the measured variable change? Location of transmitter Expected highest temperature & lowest pressure Is the process under vacuum? Measurement span Maximum pressure limits on the system Is the process connection cleaned? Type of cleaning

solution?

Performance Considerations

Diaphragm Seal System Limitations

LimitationsSmall span measurementsIncreased response timeDecreased total system accuracyTemperature-induced errors

Tonya Tip: always use the smallest diameter diaphragm required

*Recommended sizes for different measurement spans

Limitations

Resources

Questions?

Thank you!

Understanding Transmitter Seals Webinar

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