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Section 7 Accessories and Attachments
7.1 Model 32311 flow meter
A flow meter is available as an option, to attach to the top of the flow chamber, instead of the
flow rate adjustment valve usually supplied. This can be used to set an accurate flow rate of the
sample. This is especially useful with small volume packages such as small cans and bottles.
This flow meter simply replaces the standard adjustment valve, as illustrated in Figure 11 below.
If using this flow meter option, you must ensure that you first recalibrate the instrument with the
flow meter attached before you take any measurements. In addition, any measurements made
must be made using exactly the same flow rate setting as used for the calibration.
The recommended flow rate should be set at 50%, though a minimum flow rate (for small
volume packages) of 30% can be used. To set the flow rate, adjust the knob at the top of the
flow meter until the
center point
of the bead indicates the desired flow rate.
7.2 Model 32939 external power supply
Provided you have a clean external power supply, you can connect the power directly to the
instrument, using this accessory, via the RS-232 port on the instrument (as illustrated in
Figure 1 on page 11 ).
The male LEMO-6 (to the right on the illustration above) attaches directly to the instrument. The
female LEMO-6 (to the left on the illustration above) can be used to attach the instrument to
your PC. The other connection is to the transformer (illustrated to the top) which in turn is
connected directly to your power supply.
Figure 11 Standard adjustment valve (left) and flow meter (right)