© 2019 Valeport Ltd
0760824b - miniIPS Operating Manual
Page 10
5.2.4. Pressure Tare
The pressure sensor fitted to the miniIPS measures absolute pressure, i.e. it includes atmospheric pressure. The
pressure tare function allows the atmospheric pressure (as measured by the sensor before deployment) to be
removed from the readings, so the output is simply pressure of water. Note also that by taking a tare reading at
any fixed point in the water column, readings will then be output relative to that point.
The pressure tare should be taken with the sensor in the same orientation as it
will be deployed (horizontal, pointing up or pointing down) to negate any
effects of the weight of the sensing element itself. Whilst this effect is small, it
is an unnecessary contribution to the error budget.
The location of the sensor (i.e. the point relative to which all measurements
are made) is indicated by a groove and cross in the acetal sensor cap.
Unit takes a single reading to use as the Tare value. Output at that
pressure should now be approximately zero.
Tare value is removed (i.e. set to zero)
Sets specific tare in dBar or Bar (max resolution of 0.000001) depending
on units selected by #020 command.
#009;10.325 sets tare to 10.325dBar
Unit responds with current Tare value
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