YSI ProDSS Manual page 4

Parameters are
all set to [On]
(ISE=pH)
Audio
•
Enabled,
Continuous
Mode
and
Log Samples
boxes are
checked
Sample
•
Period(s)
is
set to a
number
Sample Count
•
Stabilize:
c) 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
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.
Log a reading:
d)
Once you're sure that all parameters
have stabilized, press Enter to log a
The first tim e you hit Enter,
reading.
it w ill probably just light up the
darkened screen; you have to hit
Enter again before it w ill say
"Sam ple 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 record the readings, but you'll
need to estimate values for the non-stable
parameters.
Field Procedures
is set to a number.
next to
--If turbidity values oscillate, watch them for
several minutes and estimate the average, to
the nearest whole number, considering both the
extremes and most frequent numbers. If
needed, we might be able to calculate the
average at the office.
--If DO readings stabilize or overly slowly or not
at all, the DO Sensor Cap might be failing.
Check if more than a third of the black paint is
missing from the face of the sensor.
--Notify program staff of any problems.
R ecord the data:
3.
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):
Tem perature:
a)
P ressure:
b)
DO Saturation (local):
c)
DO Concentration:
d)
mg/L
Specific Conductivity:
e)
whole µS (microSiemens)
Salinity:
f) to nearest 0.1 PSU (Practical
Salinity Units—similar to parts per
thousand)
pH:
g) to nearest 0.1
Turbidity:
h)
I f you're taking replicates at this site:
4.
Remove probes from stream, shake off
water, and replace in stream. Then stabilize
and record a second reading; you may have
to press Enter twice.
P erform a
5. Dissolved Oxygen
check:
Remove probes from stream. Rinse
with purified water if the stream was dirty.
Then shake off any water droplets from the
DO sensor tip and temperature sensor; you
can also insert a lint-free cloth through the
open slots in the sensor guard. The
4
YSI ProDSS
If possible, record the
to nearest 0.1°C
to nearest 0.01 inHg
to nearest %
to nearest 0.1
to nearest
to nearest whole FNU
drift
th
18 Edition, 2016