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3.1.3 Model 4500C
The filter housing is not removable on the 4500C. Any attempt to remove the filter
stone or the housing will destroy the transducer!
If the pressure to be measured is less than 5 psi the filter stone must be saturated. A hand
operated vacuum pump and short length of 1/2" surgical tubing is required. Hand pumps
and tubing are available from the factory. (A hand pump that has been used successfully
is the MityvacII® by Lincoln Industries Corp. of St. Louis, MO.)
The saturation procedure is as follows:
1)
Attach the tube to the transducer as shown in Figure 2.
2)
Fill the tubing with approximately 2" (5 cm) of water.
3)
Attach the other end of the tube to the hand vacuum pump.
4)
While holding the transducer so that the water rests on the filter but does not enter the
pump, squeeze the hand pump to initiate a vacuum inside the tubing. This will draw
the air out of the filter and the area behind it, replacing it with water.
5)
A vacuum of 20-25" Hg. (50-65 cm Hg.) is sufficient for proper air evacuation.
Figure 2 - 4500C Saturation
Summary of Contents for 4500AL
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