Edwards APG200

5.2 Pressure measurement
It is possible to r
ead the pressure from the gauge using a controller or by reading the
gauge voltage with a voltmeter and converng the indicated voltage to pressure.
If the gauge has a standard voltage output characterisc, if connected to our controller
then the display will indicate the measured pressure. Refer to Pressure output signal on
page 15.
Note:
The gauge models with matched v
oltage outputs are not compable with our
controllers. The gauge may not be recognised or the pressure output may not be correct.
5.2.1 APG200 with Log linear with pressure output
If the gauge is connected to a voltmeter, convert the voltage (V) to pressure (P)
according to the formulae in the following table:
Characteriscs
Formula: 10
(((V-a)/b) )
V
oltage output
Filament/pres-
sure range
P
(mbar)
P
(Torr)
P
(Pascals)
Range of formula
X (Log-linear with
pressur
e)
LC
a 6 6.125 4
V=2 - 9
b 1 1 1
X (Log-linear with
pressur
e)
M or MP
a 6 6.125 4
V=2.7 - 9
b 1 1 1
O (Log-linear with
pressur
e)
LC, M or MP
a 5.5 5.625 3.5
V=2.2 - 8.5
b 1 1 1
G (Log-linear with
pressur
e)
LC, M or MP
a 6.143 6.304 3.572
V=1.9 - 10
b 1.286 1.286 1.286
Q (Log-linear with
pressur
e)
LC, M or MP
a 5.875 6 3.875
V=1.875 - 8.875
b 1 1 1
a 5.875 6 3.875
V=2.573 - 8..875
b 1 1 1
5.2.2 Voltage to pressure conversion for APG200
The following gures shows variaon in pressure with voltage for the dierent voltage
output characteriscs of APG200.
07/2021 - ©Edwards Limited
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