Metrohm NIRS Analyzer PRO - Manual (Page 34)

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8
Air Purge Connection (Used with “Spoon Probe”)
Air purge may be used with the MicroBundle “Spoon Probe’ which uses air purging to remove
accumulated sample from the window area, under control of the software.
Part number 60039031 must be used. Install the kit as explained above. The Analyzer PRO
MicroBundle Fiber version comes with the solenoid air control valve and fittings already mounted.
Connect the output from the regulator to the air input on the instrument.
One way valves are mounted in the air in and air out connections inside the instrument: Observe the
“in” and “out” arrow marks next to the fittings.
1. Connect the air tube from the powder probe to the air out fitting.
2. Connect the air from the regulator to the air in fitting.
Adjust the pressure for effective emptying of the spoon after measurement. Pressure range 0,3 – 0,5
MPa (3 – 5 bar, 43.5 to 72.5 PSI).
The probe is designed for a standard 1” Swagelok® crimp fitting.
The “Spoon Probe” is typically used in fluid bed
dryers and other locations where sample is
conveyed in a manner where it may accumulate
on the probe and be sampled periodically.
After sampling, purge air is activated through
the purge holes, and the sample is cleared from
the sampling area, in preparation for the next
sample.
The air inlet at the base of the probe is shown.
The fitting is a ¼” NPT Swagelok SS-400-1-1
fitting, or equivalent. (Qty. 1)
It is critical to remember that the supply lines
must be sized much larger that the final deliver
line to the probe. Internal friction on a long
supply line will limit the amount of gas available
to the probe, if the line is too small. The tubing
to the probe itself is ¼” (about 6mm) however
the supply lines may have to be much larger to
accommodate the full flow required.
A ground ring is provided, as samples may build up static electricity. The probe should be properly
grounded using this ring.