YSI ADV6600 - Manual (Page 56)

Section 4. Calibration and Diagnostics
ADV6600
Y S I
Environmental
Page 46
NOTE CAREFULLY: Immersion of the pressure sensor to depths of greater than 150 % of its
specification will result in irreparable damage. Thus, the 10 m sensor must not be immersed below
15 m to avoid this damage.
The output of the sensor is in pressure units only, such as psi or dbar, and the system is not designed
for long-term deployments that require a high level of depth or level accuracy. Further, the pressure
sensor cannot be vented to automatically remove the effects of barometric pressure changes on the
overall reading. However, the pressure sensor can measure even slight changes in water level, but
the data is not automatically corrected for offsets due to barometric, temperature, or conductivity.
Users may choose to export the pressure data to an Excel spreadsheet and manually compensate for
temperature, conductivity, and atmospheric pressure changes to allow for a precise reading of the
water level (given that the necessary information is available).
The factory calibration of the pressure sensors is set to give a pressure output of zero at atmospheric
pressure at the time / place of calibration. When deploying the instrument, it may be desired to reset
the pressure offset to show zero pressure at the time / place of deployment. This may be done using
the following steps.
1. Connect the ADV6600 to a computer.
2. Launch ADVantage 6600 Software.
3. Choose Connect to System. Verify the
COM setting and Baud Rate. Click on
Connect.
4. Be sure that the instrument is positioned
properly (i.e., standing up in the vertical
position with sensors down) and is not
immersed in water.
5. Click on Set Pressure Offset in the Tools
and Utilities on-screen list (or choose it
from the System menu). The window to
the right should appear.
6. Follow the instructions outlined in the window to collect Pressure data.
7. Click on Set Pressure Offset to “zero” your pressure sensor at the current atmospheric
pressure.
8. Any pressure the instrument is being exposed to will be automatically removed (i.e., tared).
After completing the Beam Check procedure, calibrating the compass, and setting the pressure
offset, the preparation of the ADV sensors is complete. Proceed to Section 4.5 below for
calibration of the Water Quality sensors.
4-5. Water Quality Sensors – Preparing for Calibration