YSI 95 - Manual (Page 13)

Operation Section 4
YSI Incorporated Model 95 9
4.4 4.4 4.4 4.4 STIRRING STIRRING STIRRING STIRRING
It is important to realize that even a small amount of stirring will improve the DO and temperature
response times in stagnant water, because the transfer process of heat and oxygen will be facilitated
by convection. Also, the MEA dissolved oxygen probe is not totally stirring independent due to the
consumption of oxygen at the sensor tip during measurement. When taking dissolved oxygen
measurements in totally stagnant samples, the probe must be moved through the sample at a rate of
2 inches per second to provide adequate stirring.
4.5 4.5 4.5 4.5 SSSSAVING DATA AVING DATA AVING DATA AVING DATA
The Model 95 is equipped with a non-volatile memory that is capable of storing up to 50 different
sets of readings. Non-volatile means that you do not need to worry that your data will be lost due to
a power failure or interruption, such as when the batteries are removed. Each set consists of
dissolved oxygen in percent, dissolved oxygen in mg/L and temperature. The Model 95 will also
assign a site identity number to each set of readings to allow easy review of the data. This feature is
useful in situations where transcribing data is difficult or not available.
While dissolved oxygen is displayed on the screen (in
% or mg/L), depress the ENTER button and hold it
for approximately 2 seconds. The meter will flash
SAVE on the display along with the current site
identity (1 through 50) being used.
When all 50 sites are full, the display will flash FULL
on the screen. This message will remain on the screen
(even after power down) until a button is pushed.
Once you have acknowledged the memory is full, any
subsequent saved data will begin overwriting existing
data starting with site #1. No additional warning will
be displayed.
4.6 4.6 4.6 4.6 RECALLING STORED DATA RECALLING STORED DATA RECALLING STORED DATA RECALLING STORED DATA
1. To put the Model 95 into the RECALL mode,
depress the MODE button repeatedly until “rcl”
is displayed on the screen along with the site ID
number in the lower right corner.
2. Depress the ENTER button to review the last set
of data that was saved. The Model 95 will display
the dissolved oxygen in % air saturation and
temperature. Another press of the ENTER button
will display the dissolved oxygen in mg/L and the
temperature.
3. Depress the UP ARROW button to move up
SAVE
01
rcl
01