Measurement Specialties
KPSI
®
Digital Series User’s Manual
Page 18
www.Meas-Spec.com
Use the second form when the sensor is at a stable known pressure.
aXSpu!
where “p” represents the signed
known pressure value
and “u”= signed
units
.
For example, after venting the sensor at address “0” to the atmosphere, the following command
would cause a new offset to be computed:
0XS!
If the same sensor was under pressure and stable at 4.65 feet of H
2
0, the following command
would adjust the offset to ensure the 4.65-foot offset:
0XS+4.65+0!
If the same sensor was under pressure and stable at 5.00 psi, the following command would
adjust the offset to ensure the 5.00-psi offset:
0XS+5.00+1!
When the sensor has completed self-calibration, the new offset is stored into memory. A
response:
attt1
is returned by any of the above command forms. It indicates that command last send to sensor
at address “a” will be complete in “ttt” seconds, and one (1) value (offset in units of psi) will be
returned in the response to a subsequent “
D0
” command. The offset can also be displayed at
any time using the “
M3
” command.
Remember: The units for the displayed
field calibration offset
will be
psi
, regardless of
the units
you used in the XSdu! command.
C o n f i g u r i n g t h e A v e r a g i n g T i m e
setting the averaging time
The sensor supports user selectable averaging time for SDI-12 readings. The time period in
seconds is specified with the following command
aXTt!
where “t” is the signed
time in seconds
The example command:
0XT+10!
will set the averaging time to 10 seconds for a sensor at address “0.”
