Rki-instruments 35-3000RK-LEL/O Uživatelský manuál stáhnout pdf (Strana 17)

35-3000RK-LEL/O Sample-Draw Detector • 13

6. If the fail condition continues, contact RKI Instruments, Inc. for further instruction.

Slow or No Response/Difficult or Unable to Calibrate

Symptoms

• The sensors respond slowly or do not respond during the monthly response test.

• Unable to accurately set the zero or response reading during the calibration

procedure.

• The sensors require frequent calibration.

Probable causes

• The calibration cylinder is low, out-dated, or defective.

• If a demand flow regulator calibration kit is used, the demand flow regulator is not

functioning properly.

• The sample-draw detector’s flow rate is too low because of an obstructed sample line,

failed pump, etc.

• The sample-draw detector is malfunctioning.

Recommended action

1. Verify that the calibration cylinder contains an adequate supply of a fresh test sample.

2. If a demand flow regulator calibration kit is used, use a different demand flow

regulator to determine if the original one is functioning properly.

3. If necessary, set the correct flow rate with the bypass valve or flow adjust

potentiometer.

4. If you cannot set the correct flow rate, check the sample line for obstructions or kinks.

5. If the calibration/response difficulties continue, replace the sensors as described later

in this section.

6. If the calibration/response difficulties continue, contact RKI Instruments, Inc. for

further instruction.

Replacing Components of the Sample-Draw Detector

This section includes procedures to replace the sensors, hydrophobic filter, and ferrules.

Replacing the Combustible Gas 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 retaining plate, then lift

the plate, connector, and sensor out of the housing.

5. Unplug the connector from the sensor.

6. Verify that you are using the correct replacement sensor (NC-6240 is printed on the

sensor), then plug the sensor into the connector.

7. Place the sensor in the combustible gas 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. Close and latch the housing door.

10. Turn on power to the controller.

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Rki-instruments 35-3000RK-LEL/O Uživatelský manuál Strana 17