Changing the Units
As noted above, the aM! command can return the pressure in several different units. The selection
of the units is made using the XUP command:
AXUP+n+d!
where n is one of the selections from the following table and
d is the number of digits to the right of the decimal point.
N Type
Units
Comments
0
ft of water
The conversion to feet of water uses the
factor 2.3073 ft per psi.
1
Psi
pounds per square inch.
2 kPa
kilo-pascals
3
cm of water
The conversion formula is 70.3265 cm
per psi.
4
m of water
The conversion formula is 0.703265 m
per psi.
5
Mm of water
The conversion formula is 703.265 mm
per psi.
9
User units
The value has units that depend on the
values entered using the XUU command.
For example, the command
aXUP+0+2!
will specify the output to be in the default units (Feet of water) with a resolution of 2 decimal
places. The second parameter (2 in the example) is optional. If omitted, the resolution is not
changed.
Setting User Units
If you want the sensor to read out in units other than feet of water, psi, kPa, or cm of water, you will
need to use the XUP command to set the units to 9, user units. When user units are selected, the
software will use the equation:
output = psi * scale + offset
where scale and offset are values you can enter into the system.
The XUU command is used to enter the user scale and offset. The format of the command is:
aXUUso!
Where s is the signed scale and o is the signed offset.
For example, the following command will set the scale to 70.32 and the offset to 0.0, which are the
proper values to convert the psi to cm of water:
aXUU+70.32+0
Similarly, the slope and offset can be set to any values that will produce the desired units.
NOTE: Remember that both an XUU and an XUP command are required for the
ACCUBUBBLE to report in user-defined units.
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Содержание Accububble 56-0131-50-1
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