YSI ProDSS, Руководство пользователя

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3. Select your Site :
a) Select the
System
button , then
highlight
Logging [single]
by using the
down arrow. (Note: the green band
indicates which feature is highlighted.)
Select this feature by hitting Enter.
b) Before selecting a site, make sure the
Use Site List
check box has been
selected . If not, highlight that row
and hit Enter.
c) Highlight
Site[whatever is in the
brackets] . Hit Enter.
d) You will see a list of sites. Scroll down
until you find your site name, and hit
Enter. If you can’t find your site, select
“test” and note on your field sheet the
site and time.
e) The green bar should read
Select [your
site]. Hit Enter, then hit Escape twice.
This will return you to the Run screen.
SAMPLING:
1. Place the probe at the sampling point:
Standing downstream or to the side of the
probe, place it in the main current, in a
place with steady flow, adequate depth,
good mixing, and no surface turbulence.
Do not sample downstream of where
your team has disturbed the bottom.
Sample at mid-depth or 8-12” below the
surface if the water is deep. You may dangle
the probe or place it on clean rocks at the
bottom if the stream is shallow.
You must
immerse the probe at least halfway up
the guard.
Agitate the probe
under water to dislodge any
bubbles at the probe tips.
2.
Stabilize and log readings:
Turn on the Auto Stable feature:
a) Hit the Probe button , then
select Auto Stable .
b) Confirm settings (see image):
•
Parameters are all set to
[On] (ISE=pH)
•
Continuous Mode
and
Log
Samples
boxes are checked
•
Sample Period(s)
is set to [15]
•
Sample Count
is set to [10].
c) Stabilize: Hit the up arrow and select
Start Auto Stable. You’ll return to the
Run screen. On the Run screen, there
will be a flashing red symbol next to
each parameter. Wait until all of these
flashing red symbols become green and
stay green for at least two minutes
(use the on-screen clock). Also observe
the readings (particularly temperature,
DO, and pH) to look for drift.
d)
Log a reading:
Once you’re sure that
all parameters have stabilized, press
Enter to log a reading.
The first time
you hit Enter, it will probably just
light up the darkened screen; you
have to hit Enter again before it will
say “Sample Logged” at the bottom.
Anytime the screen is dark, hitting any
button just brightens it.
Jumping Values: If readings won’t stabilize
…you can still log the readings, but you’ll need
to estimate values for the non-stable
parameters. For instance, if you see turbidity
values jumping up and down, watch the
readings over a period of several minutes and
estimate the average, to the nearest whole
number, considering both the extremes and the
most frequent numbers. In a pinch, we might
be able to calculate the average at the office.
3.
Record the data:
If possible, record the
data directly off the Run Screen right after
you’ve logged your sample. It is also
possible to retrieve the data
either directly from the meter
or by linking the meter to a
computer—see instructions at
end of protocol.
Record the readings on your data
sheet, in the following order, using
our rounding convention (see
Quality Assurance protocol):
a)
Temperature:
to nearest
0.1
°
C
b)
Pressure:
to nearest 0.01
inHg