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2008K
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Preventive Maintenance Procedures
P/N 508138 Rev. J
3.10 DEAERATION AND LOADING PRESSURE
Verify that the deaeration pressure is between –24 and -25 inHg and the loading
pressure is between 18 and 20psi (between 23 and 25psi if a DIASAFE
Plus filter
system is installed) as follows:
1. With dialysate flow OFF, install a pressure gauge with a T-fitting to monitor the
pressure on the inlet (suction) side of the deaeration pump (See Figure 3, pg. 9).
2. Connect a pressure gauge equipped with a yellow connector into the red
ACETATE/ACID port.
3. In Dialysis Mode, turn dialysate flow ON and verify that the pressure gauge
on the deaeration pump indicates between -24 and -25 inHg. The needle
will be vibrating somewhat. Verify that it does not go higher than -24 inHg
or lower than -25 Hg. Verify that the pressure gauge in the
ACETATE/ACID port indicates between 18 and 20psi (between 23 and
25psi if a DIASAFE
Plus filter system is installed).
4. Record the measured values on the Annual/4000 Hour Preventive
Maintenance Checklist.
Note: When the machine is at a different elevation above sea level, it may be
difficult or impossible to achieve -24inHg. The following table will help in
determining the appropriate deaeration pressure calibration point at different
elevations:
Table 2
Elevation
Approx.
atmospheric
pressure
Minimum target deaeration
pressure relative to
atmospheric pressure
0 760 -24.0
1000 728 -23.0
2000 697 -22.0
9000 514 -16.2
10000 492 -15.5
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