UNATTENDEDMONITORING
“MAKINGGOODDOMEASUREMENTS”
It is recommended that you take the following steps prior to deployment:
• Confirm that the RS-232 and SDI-12 Auto Sleep functions are enabled. Both can be found in the
Advanced Menu under Setup.
• Confirm that the sonde Report Menu has been set up correctly.
• Confirm that the date and time are correct.
• Program the “Unattended” study and confirm that the battery voltage and system memory are
adequate for the length of the deployment.
• Start the sonde logging. Confirm that the sonde is logging data by going to the Status Menu and
making sure that the sonde displays a “Logging Active” message.
• Confirm that at least one sample has been logged in memory. View using “Quick View File” in
the sonde’s File Menu.
FINAL PREPARATIONS
Note: These instructions were written primarily for YSI sondes using the Rapid Pulse DO sensor.
Sondes fitted with optical DO probes do not have the warm-up and burn-in requirements listed in this
document.
1. Once the sonde is logging it is strongly recommended that the instrument be placed in a saturated
water bath prior to deployment. The data logged in a saturated water bath can be used as your pre-
deployment DO calibration verification. The water bath can be made with a five-gallon pail,
aquarium air pump, air stone, and tap water. Run the air pump for at least one hour prior to ensure
that the water bath is completely saturated.
To determine the DO saturation level of your water you can divide the barometric pressure by 7.6.
Example: 755 mmHg ÷ 7.6 = 99.34%
The sonde should remain in the saturated bath for at least one hour. Verify that the oxygen sensor
meets the accuracy requirements. If an adjustment is needed, recalibrate in the bath between your
samples. Do not stop the “Unattended” logging run to recalibrate.
2. Once the pre-deployment DO data has been checked the sonde can be prepped for transport. The
best way to move instruments is assembled with the sensor guard on the sonde. Removing a
calibration cup in the field exposes the probes to potential damage. Wrapping the assembled sonde in
a wet white towel will provide shock and vibration protection for the instrument while maintaining a
saturated environment for the DO sensor. Moving the instruments in a large (vented) white igloo
cooler wrapped in wet towels will provide the best protection. The cooler keeps the instruments
together, is easy to lash down in a boat or truck, and maintains the instruments in a cooler saturated
environment so pre-deployment DO data can continue to be collected.
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