12
SENSOR TYPE
The instrument’s Sensor Type must be configured for the
sensor installed. Failure to do this may result in damage not
covered under warranty. If you observe readings very close
to 0 or extremely high readings, e.g. 600%, your Sensor Type
setting may be set incorrectly.
i
Sensor Type sets the type of dissolved oxygen sensor being used;
either polarographic (black) or galvanic (grey).
Use the up or down arrow keys to highlight Sensor Type, then press
enter
to open a submenu. Highlight the sensor type corresponding
to the sensor installed on the cable and press enter to confirm. The
enabled sensor type will have an ‘X’ in the box next to it. Next, use the
down arrow key to highlight the ESC – Exit box, then press enter to
save changes and to close the sensor submenu.
If using a ProBOD sensor/cable assembly, the sensor type should be
set to polarographic.
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 menu.
• 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 Pro Series galvanic sensors are exactly like the Pro
Series polarographic sensors. The advantage of using galvanic sensors
is convenience. Galvanic sensors provide 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.
MEMBRANE TYPE
Membrane Type sets the type of membrane used on the dissolved
oxygen sensor; either 1.25 PE (Yellow) or 2.0 PE (blue). Use the up
or down arrow keys to highlight Membrane Type and press enter to
open the submenu. Highlight the membrane type corresponding to
the membrane installed on the sensor and press enter to confirm. The
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