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Differential pressure sensor plumbing

Where to install

  • If possible, install the differential pressure sensor close to the existing dial gauge.
  • Sensor should be installed with cap facing 15 to 90 degrees above horizontal
  • Locate the 1/4" NPT upstream pressure port on your regulator or a 1/4" NPT port in between your regulator and cylinder. The pressure sensor should be installed in a port that it is able to measure the pressure inside of the cylinder or container.
  • Inspect port and fitting to ensure that both are free of contaminants and excessive burrs and nicks.
  • Wrap Teflon tape 1-1/2 turns in a clockwise direction, viewed from the pipe end, leaving the first two threads uncovered. Another option is to apply a stripe of an anaerobic liquid pipe sealant around the male threads leaving the first two threads uncovered.
  • Screw finger tight into the port.
  • Wrench tighten the fitting 1.5 to 3 additional turns past finger tight. A properly assembled fittings total thread engagement should be 3.5 to 6 turns.

Close and equalize high and low pressure lines

  1. Check all valves high pressure, low pressure and the equalizing valve, are closed
  2. Open the equalizing valve. This ensures that the same pressure will be applied to both sides of the sensor
  3. Open the Low pressure (Vapor) valve slowly, check for leakage from both the high pressure and low pressure side of the sensor
  4. Close the equalizing valve. This will lock the pressure on both sides of the sensor.
  5. Open the high-pressure (Liquid) valve to apply process pressure to the high-pressure side of the sensor and establish the working differential pressure.
  6. Sensor is now in service.

Note: To protect sensor from subzero liquid gas contact, ensure no subzero liquid gas ever touches the sensor diaphragm; this will kill the sensor. This can be accomplished by installing the sensor at a higher elevation than the high pressure line output and by increasing the length of plumbing between the high pressure line output and the sensor. If you are utilizing a liquid phase out port for the high pressure line, this is especially critical.

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