PPC3™ OPERATION AND MAINTENANCE MANUAL
© 2002-2007 DH Instruments, a Fluke Company Page 146
7.2 UNIT CONVERSION
7.2.1 PRESSURE
PPC3 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 30 provides the conversion coefficients used by PPC3 to convert numerical values
expressed in SI units to corresponding values expressed in other units.
Table 30. 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
kcm
2
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. PPC3 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 30
above. For altitude expressed in meters, meters are converted to feet using 1 m = 3.28084 ft.
7.3 REMOTE [ENT]
The PPC3 remote ENTER function operates by detecting the open or closed status of the REMOTE
ENTER switch.
The normal status of the ENTER switch is OPEN. When PPC3 detects a CLOSED condition held for 300 ms,
it is interpreted as equivalent to a press of the [ENT/SET P] key.
Any switch may be used to accomplish the remote ENTER function. The switch should be installed on
the optional remote ENTER cable (DHI P/N 103128). Install the switch by connecting its two terminals to
the black and white wires of the remote ENTER cable.
1. Black wire 2. White wire
Figure 15. Remote [ENT/SET P] Connector Schematic
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