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