Bacharach PCA 3 Manual De Propietario
PCA
3 Manual
84
0024-9472 Rev 2
7.5. Sensor Replacement
All sensors are replaced in a similar manner. Do the following to replace either
the O
the O
2
, CO
LOW
, CO
HIGH
, NO, NO
2
, or SO
2
sensor. Refer to Replacement Parts on
page 90 for a list of sensors and part numbers.
NOTE: The typical life expectancy of the O
2
, SO
2
and NO
2
sensors
is 2 years. Typical life expectancy of the CO, CO
HIGH
and NO
sensors is 3 years.
1. Turn OFF the analyzer.
2. Remove the battery cover.
3. Remove the sensor retainer.
4. Remove the tubing from the gas cup of sensor being replaced.
5. Unplug the sensor along with its printed circuit board from the analyzer’s
main board.
6. Remove the sensor’s gas cup by twisting its bayonet fitting
counterclockwise, and then pulling the cup straight up.
7. Carefully remove the old sensor from the B-Smart® sensor PCB,
keeping in mind that there is an adhesive foam disk in between the PCB
and sensor.
and sensor.
IMPORTANT: When replacing the O
2
sensor, be sure that the “+”
sensor pin plugs into the PCB socket that is also marked “O
2
+”.
Also, when replacing an NO sensor, replace the bias battery.
8. Remove the replacement sensor from its plastic canister. Note that the
CO
LOW
, CO
HIGH
, SO
2
, and NO
2
sensors have a shorting spring installed
between two of their pins. Remove and discard this spring before
installing the sensor.
installing the sensor.
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 7-7.
connections on top of gas cup are aligned as shown in Figure 7-7.
10. Plug the sensor into analyzer, and then reattach tubing to gas cup.
11. Install the sensor retainer and battery cover.