RKI Instruments GX-2003 Operator's Manual download pdf (Page 39)

GX-2003 Operator’s Manual Calibration Mode • 32

Calibration Mode

Calibration mode allows you to calibrate the GX-2003’s sensor

response. It also includes a menu item which allows you to adjust the

LCD contrast.

CAUTION:BEFORE EACH DAY’S USAGE SENSITIVITY IN THE

% LEL RANGE MUST BE TESTED ON A KNOWN

CONCENTRATION OF THE COMBUSTIBLE TARGET

GAS, METHANE, EQUIVALENT TO 25 - 50% OF FULL

SCALE CONCENTRATION (The % LEL full scale is

100% LEL). ACCURACY MUST BE WITHIN -0 to + 20%

OF ACTUAL. ACCURACY MAY BE CORRECTED BY

FOLLOWING THE CALIBRATION INSTRUCTIONS FOR

THE COMBUSTIBLE CHANNEL BELOW.

If the combustible channel passes the above response test and does

not require calibration, the unit should still be calibrated periodically.

The optimum frequency of calibration depends heavily on how the

GX-2003 is used. For example, instruments used daily may need to be

calibrated weekly or monthly, while instruments that are used only a

few times a year may need to be calibrated before each use. Typical

calibration frequencies range from monthly to quarterly. Make sure to

perform the combustible channel response test as described above

and make sure to develop a calibration schedule tailored to your

application that takes this test and required calibration resulting from

this test into account.

You can program the GX-2003 to notify you when it is due for

calibration. See “Updating the Calibration Time Remaining Setting”

on page 59.

Calibration Supplies and Equipment

To calibrate the GX-2003, you will need:

• Known calibrating samples of the gases being detected. The

combustible and toxic gas samples should have concentrations in

approximately the middle of the range of detection. An oxygen-

free source, such as 100% nitrogen is recommended for setting the

oxygen zero.

• A demand-flow regulator to provide adequate sample gas flow

• Non-absorbent tubing

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RKI Instruments GX-2003 Operator's Manual Page 39