RKI Instruments GP-01 - Manual (Page 10)

5 • Description Model GP-01 Operator’s Manual
Alligator and Belt Clips
The GP-01 is available with two types of clips, the alligator clip and the belt
clip. Both are illustrated in Figure 2 below.
The alligator clip can be used to attach the GP-01 to clothing or a belt.
Teeth in the clip’s jaws prevent the unit from slipping off. The belt clip is
used to easily clip the GP-01 on a belt.
Membrane Retainer and Filter Disks
The membrane retainer is held in place by a single Phillips screw. Two
types of paper-like filter disks may be installed beneath the membrane
retainer. The smaller of the two, the H
2
S scrubber filter disk, removes H
2
S
from the air. The larger one, the sensor cover, protects the sensor from dirt
and moisture.
The H
2
S scrubber filter disks are not installed in the GP-01 as shipped from
the factory. They can be installed to protect the combustible gas sensor
from H
2
S exposure if H
2
S will be present in the monitoring area.Two H
2
S
scrubber filter disks fit into a recessed area in the sensor retainer directly
above the sensor. If installed, they prevent H
2
S in the ambient air from
reaching the unit’s combustible gas sensor. Removing H
2
S that is present
in the monitored air prolongs the life of the sensor. These filters are white
when new and darken as they absorb H
2
S. They must be changed when
Alligator Clip
Belt Clip
Figure 2: Alligator & Belt Clips