uvSVX and uvSVXe Operating Manual: MANUAL-857569191-11 | issue 1.7
Read Modbus activation status and parity status
5.3 Sampling Modes
The uvSVX will operate in a number of different modes, only one is for regular use – Continuous
Contact Valeport if you have a special requirement
Data is observed and output at a fixed sampling rate from 1 to 64Hz
set by #095
Set the sampling rate where xx = 1, 2, 4, 8, 16, 32 or 64Hz
Slow baud rates and long output strings can limit the sampling rate
5.4 Pressure Tare
The Interchangeable pressure sensor fitted in the uvSVX 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.
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 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
Auto Tare
observe current pressure and program it as current Tare value
Set manual Tare in dBar or Bar (max resolution of 0.000001) depending on
units selected by #020 command.
Example:
#009;10.325 sets Tare to 10.325 dBar
read current Tare value in the units set at the time it was observed
Enable | Disable pressure tare function
#011;0 (disable) the tare value is not subtracted from the measured pressure
#011;1 (enable) the tare value is subtracted from the measured pressure
read pressure Tare activation status - 1 (Enabled) | 0 (Disabled)
If the Pressure / Depth units or calibration are changed the Tare value must be re-observed
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