YSI Professional Plus - Manual (Page 16)

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SEtUP - DISSoLVED oXYGEN
Press Sensor , highlight Setup and press enter. Next, highlight DO and press
enter.
Enabled allows you to enable or disable the
Dissolved oxygen function. Highlight Enabled
and press enter to activate(
Q ) or deactivate( P )
dissolved oxygen. Disable dissolved oxygen
if you do not have a dissolved oxygen sensor
connected to the instrument.
If a sensor is Enabled that isn’t connected to the
instrument, the display will show an unstable, false
reading, ?????, or ----- next to the units.
Sensor Type sets the type of oxygen sensor being used: either Polarographic
(black) or Galvanic (grey). Highlight Sensor Type and press enter. Highlight the
correct sensor type installed on the cable and press enter to confirm.
If using a ProBoD sensor/cable assembly, the sensor type should be set to
polarographic.
the Pro Plus has two compatible sensors for use with a field cable:
Polarographic – this sensor has a black sensor body and is engraved with the
model number 2003.
Galvanic – this sensor has a grey sensor body and is engraved with the model
number 2002.
In terms of physical configuration, membrane material, and general performance,
YSI Professional Series Galvanic dissolved oxygen sensors are exactly like the
Professional Series Polarographic sensors. the advantage of using Galvanic
sensors is convenience. Galvanic sensors provide for an instant-on sensor without
the need for warm-up time but this affects the life of the sensor. Polarographic
sensors last longer and have a longer warranty but require a 5-15 minute warm-
up time before use or calibration.
IMPORTANT – The instrument default setting is Galvanic.
Please change the Sensor Type to match the correct sensor. If
you observe readings very close to 0 or extremely high readings
(i.e. 600%), your Sensor Type setting (Polarographic or
Galvanic) may be set incorrectly and you should immediately
ensure it matches the sensor installed on your cable.
Membrane sets the type of membrane used on the dissolved oxygen sensor.
Highlight Membrane and press enter. Highlight the correct membrane type
installed on the sensor and press enter to confirm. the Do sensor is supplied
with membranes specific to the sensor type ordered and are color coded as
described in the following tables.
Galvanic membrane kits:
Item
Color Material Description
5912 Black 1 mil teflon® traditional membrane material
5913 Yellow 1.25 mil polyethylene Improved response time and less
flow dependence than teflon®
Ships standard with the sensor.
5914 Blue 2 mil polyethylene Less flow dependence than 1.25 mil
but somewhat slower response
Polarographic membrane kits:
Item
Color Material Description
5906 Black 1 mil teflon® traditional membrane material
5908 Yellow 1.25 mil polyethylene Improved response time and less
flow dependence than teflon®
Ships standard with the sensor.
5909 Blue 2 mil polyethylene Less flow dependence than 1.25 mil
but somewhat slower response
Selecting a Dissolved oxygen Membrane:
Membrane Type Flow Dependence After 4 Minutes
Typical Response
Time - 95%
5912, 5906 - Black 60% 18 seconds
5913, 5908 - Yellow 25% 8 seconds
5914, 5909 - Blue 18% 17 seconds
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