uvSVX and uvSVXe Operating Manual: MANUAL-857569191-11 | issue 1.7
Page | 17
© 2021
– Valeport Ltd
# Code
Description
#701
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
# Code Sampling Mode Description
#039;1 Continuous
Data is observed and output at a fixed sampling rate from 1 to 64Hz
set by #095
# Code
Description
#095;xx
Set the sampling rate where xx = 1, 2, 4, 8, 16, 32 or 64Hz
#096
Read sampling rate
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
Code
Description
#009;0
Auto Tare
observe current pressure and program it as current Tare value
#009;nnnn.nnn 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
#010
read current Tare value in the units set at the time it was observed
#011;n
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
#012
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
