YSI Pro20 - Manual (Page 9)

The Pro20 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. Polarographic will be abbreviated Polaro in the instrument.
Galvanic – This sensor has a grey sensor body and is engraved with the model
number 2002.
For information about the differences on the two sensor types, see Sensor Type in
the System Setup menu section and/or the Principles of Operation section of this
manual.
If using a ProBOD sensor/cable assembly, there is no need to install a sensor
because it has a built in Polarographic dissolved oxygen sensor.
Before installing either sensor or connecting the cable to the
instrument, the Sensor Type must be configured for the sensor being
installed/connected. Failure to do this may result in damage not
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covered under warranty. The instrument will step you through this
setup the first time it is powered on. See the System Setup menu
section of this manual for instructions on configuring the Sensor
Type after the first power on.
1) Ensure both the sensor connector and sensor port on the cable are clean and
dry.
2) Grasp the sensor with one hand and the cable bulkhead in the other.
3) Push the sensor into the connector on the cable until it is firmly seated and
only 1 o-ring is visible. Failure to properly seat the sensor may result in
damage.
4) Twist the sensor clockwise to engage threads and finger tighten. Do NOT
use a tool. This connection is water-tight.
For more detailed instructions, please refer to the sensor installation sheet that is
included with each sensor.
Figure 3
Bulkhead
Sensor
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