Welch Allyn PROPAQ CS Service Manual page 35

Service Manual
b. The reported ATIS is 30.09 inches Hg. (Altimeter: three zero zero niner.)
c. Multiply the LUP (632.35) by the ATIS (30.09) times 0.033421.
This gives the local barometric pressure of 635.92 mmHg.
Example 2
a. The altitude is 1000 meters. The local uncorrected pressure (LUP) is determined
b. The reported ATIS is 764.29 mmHg.
c. Multiply the LUP (674.11) by the ATIS (764.29) times 0.00131579.
This gives the local barometric pressure of 677 .92 mmHg.
Partial pressure of test gas source
To determine the partial pressure of test gas source multiply the local barometric pressure
(as determined in step 3 above) by the certified percentage (±0.01% accuracy) of the test
gas.
Example
The local barometric pressure (as calculated in Example 1 above) is 635.92 mmHg.
The certified CO
Determine the CO
This gives the partial pressure of the CO
Table 8. Local uncorrected barometric pressure (LUP) as a function of altitude (feet)
Altitude
(feet)
-2000
-1900
-1800
-1700
-1600
-1500
-1400
-1300
-1200
-1100
-1000
-900
-800
-700
-600
from the following table to be 674.11.
gas percentage is 5.00%.
2
partial pressure by multiplying (635.92) x (0.0500).
2
Pressure Altitude
(mmHg) (feet)
816.56 1000
813.66 1100
810.76 1200
807.87 1300
804.99 1400
802.11 1500
799.25 1600
796.39 1700
793.54 1800
790.70 1900
787.87 2000
785.05 2100
782.23 2200
779.42 2300
776.62 2400
as 31.8 mmHg.
2
Pressure Altitude Pressure
(mmHg) (feet)
732.93 4000 656.38
730.27 4200 651.52
727.62 4400 646.68
724.97 4600 641.88
722.33 4800 637.10
719.70 5000 632.35
717.07 5200 627.64
714.46 5400 622.95
711.85 5600 618.28
709.25 5800 613.65
706.65 6000 609.04
704.07 6200 604.47
701.49 6400 599.92
698.92 6600 595.40
696.36 6800 590.90
Functional verification
Altitude Pressure
(mmHg) (feet) (mmHg)
10000 522.65
10333 515.93
10667 509.26
11000 502.69
11333 496.18
11667 489.72
12000 483.34
12333 477.04
12667 470.78
13000 464.60
13333 458.50
13667 452.44
14000 446.46
14333 440.55
14667 434.68
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