Dynamax HPFM3, Installation And Operation Manual, Page: 32 / 86

Revision: JUNE 2017 32
5.4.2 Priming a Totally Empty Captive Air Tank (CAT)
When first priming the HPFM or if air bubbles have entered into the HPFM system, you must pre fill the CAT with at least
2 liters of degassed, distilled water before you can start the priming process. If the HPFM has had water already
added, please skip this subsection and move on to Subsection 5.4.3 , “
Adding water to a Partially Empty Captive Air
Tank (CAT)
.” This pre-fill will assist in the removal of all air bubbles. Removing air bubbles as in Section 5.5 ,
“Eliminating Air
from the HPFM
” is a requirement for normal operation of the HPFM. Another requirement is the removal of small microscopic
bubbles that form inside the wetted areas of the HPFM and adhere to the surfaces. Note that parts of the series of instructions
are very much like Subsection 5.4.3 . That is because you must fill the HPFM unit with water to remove the air bubbles
first. The steps for priming the empty HPFM CAT are:
1. Make sure that all valves are closed.
2. If there is pressure, begin to release the pressure with the Compressed Air Supply Valve.
To release pressure, slowly turn the valve to the bleed air position (right).
3. Once the pressure is removed, close the Compressed Air Supply Valve.
WARNING!
Cover the “disconnect” and screwdriver with a towel to keep the hot water from
spraying.
4. Raise the refill tubing straight upward. Depress the Refill Kit male “disconnect” against
a hard object, such as a flat blade screwdriver, allowing the water to flow and remove
bubbles from the Refill Kit tubing.
WARNING!
Take Precautions. Use Gloves when handling the HOT Degassed Water.
5. Connect the Refill Kit to the HPFM. Once the connector is snapped shut, turn the water valve to the left and
proceed to using the following steps:
a. Make sure that there is degassed water in the Refill Kit. If not, go to Subsection 5.4.1 ,
“
Making Degassed Water
.” Make sure that you have enough water to finish the sampling project in the
Refill Kit, with water to spare. Some of the excess water will be used for the removal extraneous
bubbles from the tubing, root compression fittings, etc.
b. Pump the Refill Kit with several hand strokes. This is the pressure that will force the degassed water
into the HPFM.
c. Connect the Refill Kit to the HPFM check the tubing for air bubbles and leaks. Open the Water Supply
Valve to the left to allow the water to flow into the CAT.
d. Pump up the Refill Kit every 1-L (0.25 gallons) with another 10-15 strokes, keeping pressure and water
flow into the CAT. Note the tank pressure gage will show an increasing pressure on the compressed
air supply side of the HPFM.
e. When the tank pressure gage reaches 15 kPa (2-3 PSI), turn the Compressed Air Supply valve
to bleed the pressure from the HPFM System.
f. Make sure that you do not allow air from the Refill Kit tank to enter into the HPFM. Stop when you have
about 1 liter (1 quart) of water left in the refill kit.