RKI Instruments 1017-04 - Manual (Page 13)

Model 1017-04 Operator’s Manual • 9
Probable causes
• The calibration cylinder is low, out-dated, or defective.
• The Model 1017-04’s flow rate is too low because of an obstructed sample line, failed
pump, etc.
• The Model 1017-04’s inverter is malfunctioning causing a low flow rate.
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.
3. If you cannot set the correct flow rate, check the sample line for obstructions or kinks.
4. If the flow cannot be set properly, contact RKI Instruments, Inc. for further instruction.
5. If the flow can be set and the calibration/response difficulties continue, replace the
sensor as described later in this section.
6. If the calibration/response difficulties continue, contact RKI Instruments, Inc. for
further instruction.
Replacing Components of the Model 1017-04
This section includes procedures to replace the sensor and sample fitting ferrules.
Replacing the Combustible Gas Sensor
1. Turn off the 24 VDC power supply and the controller power.
2. Unscrew the housing cover.
3. Unscrew the two captive panel screws that secure the retaining plate until they come
out of the standoffs, then lift the plate with screws, connector, and sensor out of the
sensor block.
4. Unplug the connector from the sensor.
5. Verify that you are using the correct replacement sensor, then plug the sensor into the
connector.
6. Place the sensor in the sensor block, then position the retaining plate on the two
standoffs.
7. Secure the retaining plate to the standoffs with the two panel screws.
8. Turn the 24 VDC power supply on and turn on the controller.
CAUTION: Allow the replacement sensor to warm up for 15 minutes before you continue.
9. Calibrate the replacement sensor as described in the “Calibration” section on page 10.
Replacing the Sample Fitting Ferrules
The inlet and exhaust fittings each include two ferrules that seal the incoming or exhaust
tubing to the fitting. Replace the ferrules if the seal is bad or if you replace the sample
tubing. Always replace the ferrules as a pair.
1. Disconnect the sample tubing from the fitting, then unscrew the nut from the fitting.
2. Verify that the ferrules did not remain in the nut. If necessary, remove the ferrules
from the nut.
3. Position the nut so the threaded end is facing you, then insert the bottom (smaller)
ferrule into the nut. Insert the ferrule so the flat side is facing down.