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.
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 |
Instruction |
