34 • Calibrating Instruments
failure and the following screen will appear.
In this case you may attempt another bump test, press and release
the EDIT ENTER button to return to the TRANSMIT screen, or turn
off the GX-2009 using the EDIT ENTER and POWER buttons.
13. The SM-2009U will apply calibration gas to the instrument for the
time defined by the calibration gas sample time parameter.
14. The SM-2009U will purge the system with fresh air for the time
defined by the air sample time parameter.
15. The CAL. LED will stop blinking and be on steadily green if the
calibration passed or steadily red if the calibration failed.
16. In addition to the indication by the CAL. LED, the GX-2009 display
will indicate the calibration result for each channel by alternating
between two screens. One screen indicates whether each channel
passed or failed and one screen indicates the calibration setting for
each channel. A “P” indicates a pass and a “F” indicates a fail. Two
examples of possible outcomes are shown below.
If a successful calibration is performed, the GX-2009 will
automatically be shut off in 15 seconds. The calibration due date
will also be reset in the GX-2009.
- - - - - -
ZERO NG
CO ppm H2S ppm
CH4 %LEL OXY vol%
- - - - - -
Figure 9: Screen Indications for Calibration
P P
CAL
CO ppm H2S ppm
CH4 %LEL OXY vol%
P P
50 12.0
CAL
CO ppm H2S ppm
CH4 %LEL OXY vol%
50 25.0
All Channels Passed
F P
CAL
CO ppm H2S ppm
CH4 %LEL OXY vol%
P F
20 12.0
CAL
CO ppm H2S ppm
CH4 %LEL OXY vol%
50 18.0
CH4 & H2S Failed
Calibration
Calibration
