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)