Pressure system set-up and priming, 5 pressure system set-up and priming – Pulsafeeder Pulsar Shadow User Manual
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11.5 Pressure System Set-up and Priming
If the pressurized leak detection system is opened to the atmosphere during maintenance or
inspection, the system must be re-primed properly to avoid diaphragm damage and ensure
proper leak detection operation and system performance.
The standard factory intermediate fluid is a Silicone oil. If any other customer-specified media
is used, it must be compatible with the materials of construction. Refer to the fluid
manufacturer’s literature for appropriate safety precautions.
Use the following procedure to set-up the pressurized leak-detection system:
1. Complete re-assembly of the diaphragm, reagent head, and external components. Ensure that
reagent head and tie-bar bolts are tightened according to the appropriate torque specifications
(consult Appendix IV)
2. Remove the pressure gauge from the housing body and replace with the straight tubing connection
supplied with the pump or conversion kit. Connect a vacuum supply (hand vacuum pump) to the tube
fitting.
If the system was previously sealed, you may need to remove the plug and re-install the hose
fittings at the fill port. There should be a container in the vacuum line to trap excess barrier
fluid. An inexpensive automotive brake bleeding kit is appropriate for this purpose.
3. Connect the fill tube, supplied with the replacement diaphragm, to the fill valve tubing connection.
Any short length of the appropriate sized tubing may be used for this purpose.
4. Open the fill valve.
5. Place the fill tube into a container of the barrier fluid being used.
6. Apply vacuum, the fluid should rise into the fill tube and enter the system.
7. Observe the fluid at the exit (vacuum pump) side. When clear, air free fluid is observed, close the fill
valve, while maintaining the vacuum on the system to begin the process of drawing out excess fluid.
If you a re-using a previous diaphragm, it will take time for the silicone fluid to migrate through
the system, be patient!
8. Release the vacuum, and remove both the fill tube and the vacuum pump from the fittings.
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