Advanced Instruments, Inc.
To avoid erroneous oxygen readings and damage to the sensor:
•
Do not place your finger over the vent (it pressurizes the sensor) to test the flow indicator when
gas is flowing to the sensor. Removing your finger (the restriction) generates a vacuum on the
sensor and may damage the sensor (voiding the sensor warranty).
•
Assure there are no restrictions in the sample or vent lines
•
Avoid drawing a vacuum that exceeds 14” of water column pressure – unless done gradually
•
Avoid excessive flow rates above 5 SCFH which generate backpressure on the sensor.
•
Avoid sudden releases of backpressure that can severely damage the sensor.
•
Avoid the collection of particulates, liquids or condensation collect on the sensor that could block
the diffusion of oxygen into the sensor.
•
If the transmitter is equipped with an optional integral sampling pump (positioned downstream of
the sensor) and a flow control metering valve (positioned upstream of the sensor), completely
open the flow control metering valve to avoid drawing a vacuum on the sensor and placing an
undue burden on the pump.
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