If the analog output voltage is being used in a data acquisition system, the following formulas can be used to calculate pressure.
EXP=INT
Pressure (Torr)=Mant x 10exp
Therefore,
Note that the INT function simply returns to the first digit in a number.
Examples:
INT (2.56) = 2
INT (9.87) = 9
Voltage to pressure conversion example:
Given
V = 2.35 Volt
First calculate the exponent;
EXP = INT (2*2.35) - 6
=INT (4.7 - 6
=INT
=- 2
Next calculate the mantissa;
MANT = 1 + 18 * V - 9 (EXP +6)
=1 + 18 * (2.35) - 9 * (2+6)
=1 + 42.3 - 36
=7.3
Finally the pressure is given by;
Pressure (torr) = MANT x 10EXP
= 7.3 x
Model 2002 Vacuum Gauge | Page 15 of 37 |