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2. Connect the sensor cable lead wires and the interconnect cable lead wires to the terminal
3. Insert the other end of the interconnect cable through a watertight cord grip into the AV38
4. Connect the interconnect lead wires to the AV38 as shown on the AV38 wiring chart
4. SYSTEM OPERATION AND MAINTENANCE
4.1 Sensor Startup
The sensor is shipped with a protective cap on the sensor head to keep the membrane wet and protect it
from damage. The cap should remain on the sensor head until the sensor is installed in the sample.
Remove the cap by pulling it straight off down the side of the sensor. Be careful not to damage the
sensor membrane. Save the protective cap and use it to keep the membrane moist whenever the sensor
is removed from service.
The membrane cap is screwed onto the front of the sensor and care should be taken not to unscrew it.
The cap contains dissolved oxygen electrolyte that will spill out if the cap is removed.
The sensor has been charged and tested prior to shipment. However, it requires time to stabilize when it
is initially installed. Depending on the oxygen level of the process, the sensor may need to run for up to
12 hours to stabilize after installation.
The sensor has been calibrated for span and offset prior to shipment. The span has been set using an
air calibration at approximately 8 ppm. The operator can redo either of these calibrations, although care
must be taken, particularly with the zero calibration, to insure accurate results. For maximum accuracy it
is recommended the operator perform a 1-point calibration at the high end of the application range. This
will update the span and optimize the sensor for the particular process application. The temperature
measurement can also be calibrated with a sample calibration. If the temperature measurement requires
calibration, it is advantageous to update it prior to calibrating the dissolved oxygen measurement
because the DO reading is temperature compensated. See Section 5 for instructions on performing the
various calibrations.
Thermo Scientific AquaSensors
strip in the junction box.
Remote Display. Conduit holes are located on the base of the AV38 for this purpose.
Be sure that the wire colors of the sensor cable match those of
the interconnect cable.
Route the interconnect cable through metal conduit to minimize
electrical noise that may interfere with the sensor signal.
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AquaTrace
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Trace DO System User Guide
13
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