8
Calibration
Temperature
All probe and cable assemblies have a built-in thermistor. Temperature
calibration is not available or required. To verify the temperature sensor,
compare it to a NIST traceable thermistor by touching the thermistors
together and observing the measurements.
Dissolved Oxygen
Calibration Requirements:
• The approximate true barometric pressure (in millibars [mbars]) of the
location at the time of calibration.
True Barometric Pressure (mmHg) =
[Corrected BP mmHg] – [2.5 * (Local Altitude in ft. above sea level/100)]
mBar = mmHg *1.333
• The approximate salinity of the water to be analyzed. Fresh water’s
salinity value is approximately zero parts per thousand (ppt). Seawater
has an approximate salinity of 35 ppt.
• For highest accuracy, complete all calibrations at a temperature as
close as possible to the sample temperature.
1. For the field probe, place 5-6 drops of clean water (tap, distilled, or
deionized) into the sponge inside the calibration bottle. Turn the
bottle over and allow any excess water to drain out of the bottle. The
wet sponge creates a 100% water-saturated air environment for the
probe, which is ideal for calibration, transport, and storage of the DO
probe. For calibration, the probe remains in a water-saturated air and
is
not
submersed.
For the lab BOD probe, simply use the same bottle the probe is stored
in with approximately 1 inch of water in the bottom. This creates a
100% water-saturated air environment for the probe, which is ideal for
calibration and storage of the Model 200-BOD probe. For calibration,
the probe remains in a water saturated air atmosphere and is not
submersed.
2. For the field probe, slide it into the calibration bottle. Be sure the
membrane does not touch the sponge.
3. Turn on the unit by pressing the Power
YSI EcoSense Handheld Overlay
12/19/2016
DO200M
colors:
Black background
PMS 7482 C power symbol
PMS 130 C logo
Reverse white all other imagery
DO
200
M
INPUT
EcoSense
®
Mode
CAL
Recal
Timer
Date
Time
key. Wait 10 to 15 minutes
for the dissolved oxygen and temperature readings to stabilize.
4. Press
CAL
.
5. The LCD prompts for the local pressure in mBar. Use Up and Down
keys to increase or decrease the pressure value respectively. See
Appendix A to convert barometric pressure units to mBars.
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