Fluke RPM4 Unit Conversion, Pressure, To Convert from Pa To, Multiply by, See Altitude Note below

RPM4™ OPERATION AND MAINTENANCE MANUAL

7.2UNIT CONVERSION

7.2.1 PRESSURE

RPM4 performs all internal calculations in SI units. Numerical values input or output in other units are converted to SI immediately after entry and back to other units just before output as needed.

Table 28 provides the conversion coefficients used by RPM4 to convert numerical values expressed in SI units to corresponding values expressed in other units.

Table 28. Pressure Unit of Measure Conversion Coefficients

TO CONVERT FROM Pa To			MULTIPLY BY
Pa	Pascal	1.0
mbar	millibar		1.0 E-02
hPa	hecto Pascal		1.0 E-02
kPa	kilo Pascal		1.0 E-03
bar	Bar		1.0 E-05
mmWa @ 4°C	millimeter of water		1.019716 E-01
mmHg @ 0°C	millimeter of mercury		7.50063 E-03
psi	pound per square inch		1.450377 E-04
psf	pound per square foot		1.007206 E-06
inWa @ 4°C	inch of water		4.014649 E-03
inWa @ 20°C	inch of water		4.021732 E-03
inWa @ 60°F	inch of water		4.018429 E-03
inHg @ 0°C	inch of mercury		2.953 E-04
kcm2	kilogram force per centimeter square		1.019716 E-05
mTorr	milliTorr (micron of mercury	7.50063
Torr	Torr (millimeter of mercury)		7.50063 E-3
user	User		User defined coefficient
Ft	feet of altitude		see Altitude Note below
M	meter of altitude		see Altitude Note below

Altitude Note: Quantities expressed in units of altitude follow MIL-STD-859A “Static Pressure, p, in Inches of Mercury for Values of Pressure Altitude, H, in Geopotential Feet.” MIL-STD-859A provides tables of pressure in inches of mercury as a function of altitude in feet. RPM4 uses a set of equations to model the pressure/altitude relationship. The worst case deviation between the MIL-STD-859A table and the calculated pressure is 0.0001 inches of mercury (0.3 Pa). The pressure quantity expressed in inches of mercury is converted to Pascal following Table 28 above. For altitude expressed in meters, meters are converted to feet using 1 m = 3.28084 ft.

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