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Instruction 24-94486-10
Maintenance
6.5 Nitric Oxide Sensor Battery Replacement
A single lithium battery, located on the NO Smart Sensor assembly, applies
a bias voltage to the NO sensor to prevent the sensor from destabilizing
when the analyzer is turned off. The NO bias battery is expected to last at
least the life of the NO sensor.
Note: It is recommended that the bias battery be replaced whenever the NO
sensor is replaced.
Material Required:
• Bias battery (refer to Section 8.1 Replacement Parts)
Procedure:
1. Follow the instructions in Section 6.3 Smart Sensor Replacement to
remove the Smart Sensor assembly from position 4.
2. Remove the old battery from its holder on the Nitric Oxide printed
circuit board.
3. Insert the new battery with the positive side facing away from the
sensor (the battery contact is stamped with a + symbol) .
4. Re-install the Smart Sensor assembly.
5. Before powering up and using the analyzer, allow the Nitric Oxide
sensor to stabilize as described below. Note that recalibration of the
Nitric Oxide sensor is not required after replacing its bias battery.
Depending on how long the Nitric Oxide sensor was without bias
voltage, the time required for the sensor to completely stabilize varies
from less than a minute to several days. Typical stabilization times
are shown below. Generally, however, the sensor is sufficiently stable
after 4 hours for measurement purposes.
Bias battery removed for . . . Stabilization time
Less than 15 minutes Less than 1 minute
Less than 1 hour Less than 5 minutes
Less than 2 days Less than 4 hours
Greater than 2 days Up to 2 days