User guide

35-3000RK-OXY Sample-Draw Oxygen Detector • 15
Recommended action
1. Verify that the calibration cylinder contains an adequate supply of a fresh test sample.
2. If necessary, set the correct flow rate with the bypass valve or flow adjust
potentiometer.
3. If you cannot set the correct flow rate, check the sample line for obstructions or kinks.
4. If the calibration/response difficulties continue, replace the oxygen sensor as
described later in this section.
5. If the calibration/response difficulties continue, contact RKI Instruments, Inc., for
further instruction.
Replacing Components of the Oxygen Sample-draw Detector
This section includes procedures to replace the sensor, filter, and ferrules.
Replacing the oxygen sensor
1. Turn off the controller.
2. Turn off power to the controller.
3. Open the housing door of the sample-draw detector.
4. Unscrew and remove the two screws that secure the sensor retraining plate, then lift
the plate, connector, and sensor out of the housing.
5. Unplug the connector from the senor cable socket.
6. Plug the socket of the replacement sensor into the connector.
7. Place the sensor in the oxygen sensor cavity, then position the retaining plate on the
two standoffs.
8. Secure the retaining plate to the standoffs with the two screws you removed in step 4.
9. Turn on power to the controller.
10. Turn on the controller.
11. Calibrate the replacement sensor as described in the “Calibration” section on page 17.
Replacing the filter
1. Turn off the controller.
2. Turn off power to the controller.
3. Open the housing door of the sample-draw detector.
4. Note the direction of the arrow on the filter. The arrow indicates the direction of the
sample flow.
5. Disconnect the filter from the elbows on each end of the filter, then remove the filter
from the sample-draw detector.
6. Make sure the arrow is pointing in the same direction as the arrow on the filter you
removed, then connect each end of the replacement filter to the elbows.
7. Verify that the flow rate is approximately 1.5 SCFH, then close the housing door.
8. Turn on power to the controller.
9. Turn on the controller.