Rki-instruments 35-3000RK-LEL/O Uživatelský manuál stáhnout pdf (Strana 20)

16 • 35-3000RK-LEL/O Sample-Draw Detector

Calibration, Combustible Sensor

This section describes how to calibrate the combustible sensor in the sample-draw

detector. It includes procedures to prepare for calibration, set the zero reading, set the

response reading, and return to normal operation.

The standard calibration gas for the sample-draw detector is methane. The sample-draw

detector may be calibrated to other combustible gases such as hexane or hydrogen. Use

the correct calibration gas for your installation.

NOTE: Calibrating the sample-draw detector may cause alarms. Be sure to put the

controller into its calibration program or disable external alarms before

continuing.

NOTE: This procedure describes calibration using a demand flow regulator.

Preparing for Calibration

NOTE: If you can verify a fresh air environment, it is not necessary to use the zero air

calibration cylinder to set the zero reading.

1. Follow the instructions in the controller’s operator’s manual for entering calibration

mode.

2. Screw the regulator into a zero air calibration cylinder.

Setting the Zero Reading

1. Connect the sample tubing from the demand flow regulator to the sample-draw

detector’s inlet line. This step is not necessary if you verified a fresh air

environment earlier in this procedure.

2. Allow the sample-draw detector to draw sample for one minute.

3. Follow the directions in the controller’s operator’s manual for setting the zero

reading. If you used a zero air calibration cylinder to set the zero reading, proceed to

step 4. If you verified a fresh air environment, proceed to the next section, Setting the

Response Reading.

4. Disconnect the sample tubing from the inlet line.

5. Unscrew the regulator from the zero air calibration cylinder.

Setting the Response Reading

1. Screw the regulator into the combustible gas calibration cylinder.

2. Connect the sample tubing from the demand flow regulator to the sample-draw

detector’s inlet line.

3. Allow the sample-draw detector to draw sample for one minute.

4. Follow the directions in the controller’s operator’s manual for setting the span.

5. Disconnect the sample tubing from the inlet fitting.

6. Unscrew the regulator from the combustible gas calibration cylinder.

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Rki-instruments 35-3000RK-LEL/O Uživatelský manuál Strana 20