4
The Pro20/Pro20i 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’s menu.
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 (Pro20
only) to the instrument, the Sensor Type must be configured
for the sensor being installed/connected. Failure to do this
may result in damage not 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.
i
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
