Pressure Tare - Valeport miniIPS2 Operating Manual

Setting Up the mniIPS2

5.7 Pressure Tare

The Interchangeable pressure sensor fitted in the miniIPS2 and 2e measures absolute pressure, that is, it
includes atmospheric pressure. The pressure Tare function allows the atmospheric pressure (as measured
by the sensor, normally before deployment) to be removed from the observations so the output is simply
the pressure of water.
The Tare function is performed after any User Cal is applied and conversion to depth if the units selected are in
If you set the Tare in one unit it will be held in that unit until re-observed regardless of whether you change the
By taking a Tare reading at any fixed point in the water column, readings will then be output relative to that
• The pressure Tare observation 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
Code Description
#007 Enable | Disable pressure Tare function
#007;0 (disable)
#007;1 (enable)
#008 Read pressure Tare status
#009;0 Auto Tare (observes current pressure reading and programs the Tare value)
#009;nnnn.nnn Sets specific Tare in dBar or Bar (max resolution of 0.000001) depending on units
selected by #018 command.
Example:
#009;10.325 sets tare to 10.325dBar
#010 Read the current Tare value in the units set at the time it was observed
If the Pressure Module, units or the calibration are changed the Tare value must be re-observed
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feet (f) or metres (M).
unit subsequently
point
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