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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

  • Ensure that the tank high and low pressure lines are CLOSED prior to the installation process, and that your plumbing accommodates equalizing the high and low pressure lines
  • In order to protect the sensor form damage, you MUST equalize the pressure in the two lines BEFORE installing or removing the sensor

Physically connect the sensor

  • Close the high and low pressure tank lines and open the equalization valve if present
  • Plumb the high pressure line from your tank, representing the pressure at the bottom of the tank, to the sensor port labeled "H" ("High Pressure")
  • Plumb the low pressure line from your tank representing the headspace pressure at the top of the tank to the sensor port labeled "L" ("Low Pressure")
  • Within 5-10 minutes, you should see an update in the Pulsa dashboard

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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