YSI BOD Analyst Pro - Manual (Page 56)

YSI BOD Analyst Pro ® User Manual 56
The default Supersaturation setting is 9.09 mg/L. You may change it if you like. Often altitude
would be a reason to change this. It is not uncommon to collect a sample in cold weather that is
over 10 mg/L. While a 10 mg/L sample may not be supersaturated at low temperatures it could be
at 20
C. If such a sample is placed in the incubator it may “outgas” and cause erroneously high
BOD. The supersaturation alarm will warn you that the reading is above the value that you have
specified. It indicates that there is a risk of supersaturation. The warning appears as follows:
If you do not want to store the reading, press SKIP and you can take steps to remedy the situation.
If you want to store the reading anyway press CONFIRM.
All of the alarm settings are set on The YSI Instrument Parameters form. See Section 10.5 for
additional information.
6.4 DERIVED INITIAL DOS
If you have checked the Derive initials field on the General Setup Form then the program will
automatically derive Initial DOs for you whenever it can. This can save time without
compromising accuracy in many applications. If required later you can “write” over a derived
Initial DO by making a measurement using the Retake This Bottle operation.
Supersaturated
Store anyway?