INFICON 2020ComboPRO Portable Photoionization Detector - Manual (Page 82)

ISP-074-575-P1D 75 75
NOTE: A DB-25, female connector is sometimes a parallel port. Do not connect the serial
port of the converter to a parallel port.
Pre-filter Tube Holder
INFICON’s optional Pre-Filter Tube Holder (A1790500) is shown in figure 24
below. The holder will accept the optional benzene pre-filter tube (F1760161), the
optional activated charcoal pre-filter tube (F1760160) for clean air calibration, the
optional humidity reduction tube (F1760162), and the optional charcoal sample
collection tube (F1760163).
The tube holder attaches to the 2020ComboPRO on the inlet nozzle replacing the
standard inlet nozzle cap. It is a simple twist lock application.
Figure 25. Tube Holder
To insert a pre-filter tube into the tube holder:
1. Unscrew the top part of the tube holder immediately above the tube
window.
2. Break off the ends of the glass tube by inserting the tube end into the
hole just above the tube holder window and snapping off the end.
3. Insert tube into holder.
4. Re-screw on the top part of the tube holder (note: the tube holder is
designed to compensate for any minor irregularities in the tube that
result from the breaking off of each end).
To remove a pre-filter tube from the tube holder:
1. Unscrew the top part of the tube holder immediately above the tube
window.
2. Lift the pre-filter tube from the tube holder.
3. Either insert another tube or re-attach the top part of the tube holder.