208 • Appendix H: 10.0 eV/Benzene PID Sensor
GX-6000 Operator’s Manual
Tube and Tube Holder
Benzene detection typically requires the use of a filter tube. The filter tube will scrub out
most VOCs other than benzene but will not scrub out nitrobenzene, cyclohexane, n-
octane, or n-pentane. The filter tube is installed in a tube holder and needs to be replaced
regularly.
A tube holder and a box of tubes are included with 10.0 eV/benzene versions of the GX-
6000.
Tube
Each tube has a 3/4 line on it. If the tube becomes discolored and if the discoloration
extends beyond the 3/4 line, the tube is no longer effectively scrubbing non-benzene gases
and needs to be replaced.
Tubes must be stored in a cool, dark place (0 - 25 °C/ 32 - 77 °F) and must be used before
the expiration date that is printed on the box. If the tubes are being stored in a refrigerator,
take them out of the refrigerator and let them sit overnight before using them.
Tubes do not contain cadmium, mercury, or chrome and may be disposed as general waste.
Tube Holder
The tube holder attaches to the GX-6000’s inlet fitting. It has a breakaway feature
ensuring that the GX-6000 will not be damaged by hitting the tube holder on something
when it is installed. The tube holder should only be used in Benzene Select Mode or when
performing a calibration in TUBE CAL. If the tube holder is attached to the instrument’s
inlet fitting in Measuring Mode, it will cause a low flow alarm.
Figure 48: Tube Holder Component Location
Front Half
GA S
3/4 Line
Tube
Exploded View
Breakaway Feature
Tube Holder with Tube
Tip Reservoir
To GX-6000 Inlet Fitting
Back Half
Cap
Tip-Breaking Feature