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MATERIAL COMPATIBILITY & ISOLATION

Pressure Measurement for Corrosive Media

Corrosive-service pressure measurement is a materials-and-containment decision before it is a range decision. Every wetted part, seal and process connection must be checked against the actual chemical service.

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DIRECT ANSWER

What is the practical starting point?

Start by defining gauge, absolute or differential pressure and the full pressure-temperature envelope. A compatible direct process connection may be simplest; a diaphragm seal can isolate the transmitter from corrosive, viscous or plugging media, but the seal material, fill fluid, diaphragm size and mounting arrangement introduce their own limits.

APPLICATION BOUNDARIES

When to use—and when to stop and review

When to consider this approach

  • Chemical service with a documented composition and concentration
  • Applications requiring a compatible direct connection or diaphragm isolation
  • Pressure, level or filter measurements with a defined pressure reference

When not to assume suitability

  • Do not choose wetted material from a generic fluid name without concentration and temperature.
  • Do not assume a diaphragm seal removes every corrosion or permeation risk.
  • Do not field-match a seal and transmitter without the manufacturer-approved filled-system design.

SELECTION FACTORS

Data to confirm before model selection

Use this list to prepare a traceable quotation request.

  1. 01Gauge, absolute or differential measurement
  2. 02Normal range, vacuum, static pressure and overpressure events
  3. 03Chemical identity, concentration and contaminants
  4. 04Process and ambient temperature cycle
  5. 05All wetted materials, gasket and connection requirements
  6. 06Direct mount, capillary, flushing and maintenance access
  7. 07Output, hazardous-area and project documentation needs

TECHNOLOGY COMPARISON

Compare the decision factors

ArrangementWhy consideredApplication boundary
Direct-mounted transmitterShort pressure path and simple installationSensor diaphragm and every wetted part must be compatible
Remote diaphragm sealSeparates the sensing assembly from corrosive or plugging process mediaFill-fluid and capillary temperature effects, response and seal construction require calculation
Impulse-line DP arrangementSupports differential or remote mounting tasksLines can plug, leak, freeze or react with the process; routing and maintenance matter

EXAMPLE APPLICATION

How to frame the requirement

For a mixed-acid service, provide each constituent and concentration at normal, cleaning and upset temperatures; “acid” alone is not enough to approve a diaphragm or gasket material.

RELEVANT INSTRUMENTS

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These products are available for selection and inquiry. Unverified model-specific Technical Facts remain isolated until the controlled technical review is complete.

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FAQ

Questions engineers ask first

Last reviewed:

Does a diaphragm seal protect the complete assembly?

It isolates the transmitter sensing assembly from the process, but the seal diaphragm, gasket, connection and any flushing parts remain exposed and must be compatible.

Why does capillary temperature matter?

Seal fill fluid expands and contracts with temperature, which can shift pressure at the transmitter and affect response. The selected filled system must be evaluated as one assembly.

ENGINEERING SUPPORT

Turn process data into a reviewable instrument request.

Share the medium, operating envelope, installation and required output. We will flag missing information before confirming a model.

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