Specifications

PCA

9. Attach the gas cup to new sensor, making sure that when the

sensor assembly is plugged into the analyzer’s main board, the

tubing connections on top of gas cup are aligned as shown in

Figure 6-3.

10. Plug the sensor into analyzer; and then reattach tubing to gas cup.

11. Install the sensor retainer and battery cover.

12. Allow the sensor that was just installed time to stabilize in the

circuit before continuing with this procedure. Stabilization time

for all sensors (except for the NO sensor) is about 1 hour. The NO

sensor baseline technically requires several days to stabilize but

should be sufﬁ ciently stabilized for use in approximately 4 hours.

13. Turn ON the analyzer and conﬁ rm that no sensor errors occur

during warm up.

NOTE: Discard an old sensor in accordance with local and

federal hazardous waste disposal laws.

14. Enter the B-Smart

calibration code, or calibrate the new sensor(s)

per Section 5 (except the O

sensor which does not require

calibration).

6.4 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 destabi-

lizing 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 to remove the 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 toward the sensor

(the battery contact is stamped with a + symbol) .