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9. Rinse or clean the reagent head with an appropriate material.
10. Remove the diaphragm by running a blunt blade along the periphery and prying it
out.
11.2 Inspection
Remove and inspect the diaphragm assembly. It may have taken a permanent
convex/concave set as a result of normal flexure and conformance to the dish-
plate. This condition is normal and is not cause for replacement. The diaphragm
must be replaced if it is deformed, dimpled, or obviously damaged.
If the diaphragms have been removed from the support ring, the entire
assembly should be replaced to ensure proper sealing of its components.
11.3 PULSAlarm® Diaphragm Reinstallation
1. Ensure that the critical sealing areas of diaphragm assembly, reagent head,
and pump head are clean and free from debris. Align the diaphragm
assembly capillary tubes with mating holes in the seal groove in the reagent
head and position it in place against the reagent head. Ensure seating of the
diaphragm sealing ring into the mating groove in the reagent head.
2. Install the reagent head bolts and tighten in an alternating pattern to ensure an
even seating force. Torque to the values recommended in the Installation,
Operation, and Maintenance manual appropriate to the pump.
3. Apply sealing compound to the gauge/pressure switch assembly threads and
reinstall to the upper port on the reagent head.
4. Apply sealing compound to the fill valve assembly pipe plug and reinstall to the
lower port on the reagent head.
5. Connect a hand-held vacuum pump or other vacuum source to the vacuum
port, which fits 6 mm (1/4 in.) I.D. tubing.
Diaphragm damage or decreased flow will occur if a vacuum is not drawn
before the pump is returned to service.
6. Re-prime the pump head hydraulic system
7. If required, test operation
8. After diaphragm set-up and priming, the pump is ready to be returned to
service.
12.0 Barrier Fluid Setup
The barrier fluid should be chosen for compatibility with the process and
environmental conditions. The fluid chosen should have as low a viscosity as
possible to aid in priming the system. Water can be used, and ethylene or
propylene glycol can be added for corrosion and temperature protection. Thin oils
such as silicone oil or mineral oil can also be used. Liquids of higher viscosity will
extend the time required to properly prime the system. Thinner liquids will allow for
faster setup.
Pulsafeeder supplies low viscosity silicone oil standardly.
Summary of Contents for PULSAlarm Pulsa Series
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