Rki-instruments GX-2012 Manual Manual de usuario descargar pdf (Pagina 176)

168 • Calibrating the GX-2012 GX-2012 Operator’s Manual

If any of the sensors cannot calibrate to the proper value, FAIL displays

along the bottom of the screen and the GX-2012 lists the sensor(s) that

failed to calibrate. In the example below, the OXY and H

S channels

failed calibration. The other sensors calibrated normally.

The buzzer and alarm lights activate. Press and release the RESET

SILENCE button after the buzzer and lights stop to reset the alarm and

return to the calibration menu. Attempt to calibrate again. If the failure

continues, investigate the cause. See “Troubleshooting” on page 143.

16. Disconnect the tubing from the probe.

17. If you have a 5 sensor unit and wish to calibration the %volume

combustible gas sensor, go back to step 1 and repeat the process,

selecting the %volume calibration gas value screen in step 12 and using a

%volume methane cylinder to fill your gas bag.

If you are finished calibrating, use the (SHIFT)T button to navigate to

the NORMAL menu item, then press and release the POWER ENTER

button to return to Measuring Mode.

Calibrating with the Single Calibration Method

This section describes calibration using the Single Calibration method.

To calibrate using the Auto Calibration method, see “Calibrating with the

Auto Calibration Method” on page 165.

The procedure below describes a span adjustment of one channel using a

calibration kit that includes a 4-gas calibration cylinder, a 0.5 LPM (liters per

minute) regulator, and non-absorbent sample tubing. The standard 4-gas

cylinder consists of 50% LEL methane, 12% oxygen, 50 ppm CO, 25 ppm

S, and a balance of nitrogen. In the example below, the CH

channel’s

span is adjusted. See “Parts List” on page 158 for available calibration kits

and calibration kit spare parts.

Calibration cylinders that contain only one target gas may also be used for

single calibration. For channels other than oxygen, RKI Instruments, Inc.

recommends that you use a cylinder that contains a concentration of 10-50%

of the full scale value of the target gas. For example, if you are calibrating the

ppm

MAINTENANCE

FAIL

H2S

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Rki-instruments GX-2012 Manual Manual de usuario Pagina 176