YSI ADV6600 - Manual (Page 64)

Section 4. Calibration and Diagnostics
ADV6600
Y S I
Environmental
Page 54
6. Press Enter again to return to the Calibrate menu.
ORP readings for the same solution can vary up to 100 mV depending on the temperature.
However, no standard compensation algorithms exist for this parameter. Be sure to take this factor
into account when reporting ORP values and checking sensor calibration. When entering
calibration values for Zobell solution, consult the following chart:
Temperature, C Zobell Solution Value, mV
-5 270.0
0 263.5
5 257.0
10 250.5
15 244.0
20 237.5
25 231.0
30 224.5
35 218.0
40 211.5
45 205.0
50 198.5
Note: Instructions for preparation of ORP calibrator solutions (including Zobell reagent) can be
found in Section 2580 A. of Standard Methods for the Examination of Water and Wastewater.
Alternatively, the Zobell solution is available from YSI.
4-6.7. Ammonium
When selecting to calibrate Ammonium, you will be given the choice of a 1-point, 2-point, or 3-
point calibration. The temperature response of ion selective electrodes is not as predictable as that
of pH sensors. Therefore, be sure to carry out a 3-point calibration the first time you use the probe.
This will provide a default setting for the effect of temperature on your particular sensor. After this
initial calibration, you can use the less time-consuming 2-point and 1-point routines to update the 3-
point calibration. However, it is strongly recommended to perform a new 3-point calibration after
each deployment of 30 days or longer.
A 1-point calibration is used to adjust a previous calibration, using any solution of known
ammonium concentration.