Diaphragm Seal Repair

Diaphragm Seals are typically used with pressure transmitters, but can also be used with pressure gauges and pressure switches. They are recommended in applications where the process medium is:

  • is aggressive, corrosive, toxic and/or highly viscous
  • has a (extremely) high or low temperature
  • has crystallization and/or polymerization

Given the above applications, seals are often subjected to harsh environments, rendering them damaged. High temperatures can ruin seals by heating fill fluids. High pressure water jets, corrosive materials and dents can also cause damage.

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Bliss Anand understands that constantly replacing your diaphragm seals can get expensive, so we offer Diaphragm Seal Refurbishment Services. We will replace an old Diaphragm Seal from an existing transmitter-seal assembly at half the cost of a new transmitter-seal assembly, so you can get your project running smoothly again with minimal disturbance.

Benefits of Seal Renewal

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  • Significantly more economic than ordering a completely new instrument
  • Before executing the order, the transmitter is tested for proper functioning, so there are no unnecessary costs for a repair executed in vain
  • All brands of pressure transmitters are compatible and new Diaphragm Seals can be mounted to them
  • A clear and written quotation, so you have a clear insight in the costs and actions beforehand
  • A repair/renewal of Diaphragm Seals often provides valuable information regarding the process and offers the opportunity of a better solution for increased lifetime

For more information, download our catalogue: Badotherm Diaphragm Seals Repair Service or call us at 281.479.2457 if you have questions about Diaphragm Seal Refurbishment.

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Low Gauge Pressure Diaphragm Seals

Standard diaphragm seals limit you to measuring down to 100mbar. Beyond this, measurements are inaccurate and often not possible at all.

This can be problematic when trying to measure lower pressure applications, so we are offering you a solution – our Low Gauge Pressure Seals, developed for measuring pressures as low as 5mbar with minimal temperature effects.

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Typically, in order to obtain low-pressure readings in applications, nitrogen blankets are used to prevent process gases from entering the atmosphere. You need to be able to accurately measure and monitor the pressure of the nitrogen blanket in order to minimize its interference with the process in the vessel.

Unfortunately, nitrogen blankets with an overpressure are unstable in a corrosive environment that uses diaphragm seals. The combination of the seal and the low overpressure range (approximately 10mbar for nitrogen blankets) results in high temperature effects when exposed to process and ambient conditions. The high temperature effects then lead to unreliable and unstable data.

With the Low Gauge Pressure Diaphragm Seal, the minimum GP range reduces from 80 mbar with a standard Diaphragm Seal to only 5 mbar with the LGP Diaphragm Seal. Similarly the ambient temperature effect reduces from 0.006 psi (0.4 mbar) per 50°F (10°C) to 0.0004 psi (0.03 mbar) per 50°F (10°C), while the process temperature effect reduces from 0.006 psi (0.39 mbar) to 0.001 psi (0.09 mbar).Screen Shot 2017-05-22 at 11.20.26 AM

The LGP Diaphragm Seal also provides additional benefits:

  • The way of mounting the transmitter to the vessels has no effect on the zero and span adjustments of the transmitter, so there is no zero adjustment required
  • There is no effect on the performance by a change in the density of the fluid caused by ambient temperature fluctuations; so there is no mounting effect.

For more information, please download the LGP Diaphragm Seal brochure here: Badotherm Diaphragm Seal Solution Low Gauge Pressure (LGP)