3M Air Cleaner 3M Benchtop Air Ionizer User Manual

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6
7.21 Attach the flat plate electrode to the 3M
™
Charge Analyzer 711.
Refer to the owner’s manual for the Analyzer 711 for complete
operating instructions.
7.22 Place the Analyzer 711 on its side allowing for viewing of the
display. Position the Analyzer 711 so that the plate is parallel to
the ionizer at a distance of one foot. The plate of the Analyzer 711
should be centered (up & down, left & right) in the air stream. It
may be necessary to raise the ionizer from the surface to allow for
centering on the Analyzer 711 charge plate. If so, use a block of
appropriate height to elevate the Analyzer 711. Please note that the
plate must be kept totally isolated from ground and that the edge of
the plate should be raised up a minimum distance of 3 in. from the
work surface. Reference ANSI/ESD-STM3.1.
7.23 Turn on the ionizer at high speed and allow it to run for five
minutes.
7.24 Charge the plate positive as described in the Analyzer 711
operating instructions for “Static Decay Time” mode. Observe the
discharge time indicated on the Analyzer 711. Repeat this step for
negative polarity.
7.3 Ion Balance
The ionized air blower will stay within an offset voltage of +/-30 volts
(max. deviation from zero) at a distance of one foot, when measured
using the following procedure.
7.31 Position the ionizer and CPM as stated above in Section 7.22.
7.32 Turn on the ionizer at high speed and allow it to run for five
minutes.
7.33 Use a ground wire to ground the charge plate of the Analyzer 711.
This will remove any/all residual charge present on the charge
plate. If the CPM does not zero, adjust the zero control.
7.34 Remove the ground wire and observe the display on the Analyzer
711. The voltage (either ±) observed during this time is the
“offset voltage” and is a measure of instantaneous ion imbalances
produced by the ionizer.

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