System operation

Patron counting

A patron counter is mounted on each lattice. Each patron counter will increment only for the corridor it is facing. Since there is always one more lattice than there are corridors, the patron counter facing out, away from the system, will under normal circumstances always have a zero patron count.

Patron counting is set by the technician at installation to either

•Count patrons as they enter through a corridor

•Count patrons as they exit through a corridor

•Count patrons as they enter and count patrons as they exit through a corridor

Each patron counter counts independently. There is not a display for a total running count of all corridors for the system for 2–, 3–, or 4–corridor systems. For a total patron count for multiple-corridor systems, you will need to record and add together the patron counts on the individual patron counters. If the system is configured to count patrons as they enter and as they exit, you will need to divide this total in half, as the system is, in effect, counting each patron twice (once as they enter, and then once as they exit).

Each patron counter is backed up by battery power so it will not reset to zero anytime power to the system is shut off, disconnected, or otherwise interrupted (for example, a power outage).

Adjusting speaker volume

Each lattice has a speaker inside its base that will make the alarm sound if an alarm condition occurs. If the alarm is too loud or too soft, the volume may be adjusted manually.

Note: To adjust the speaker volume, you will need a small (4 mm [0.16 in.] maximum diameter) flat blade screwdriver.

To adjust speaker volume

1. Locate the speaker volume adjustment knob inside the opening for the speaker in the lattice base cover, next to the speaker.

2. Use the small (4 mm [0.16 in.] maximum diameter) flat

Figure 4 Speaker volume adjustment

blade screwdriver in the adjustment knob slot to turn the

 

speaker volume up or down to the desired level.

 

Tip: Use a secured book to trigger the alarm so you can hear it as you adjust the volume.

Note: Adjusting the volume may also affect the frequency (pitch) of the alarm sound.

3.Confirm that the alarm can be heard and is set to a volume level that is effective and appropriate for the library.

4.Repeat for each lattice.

Copyright © 2009 3M. All rights reserved.

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3M 9900 Series owner manual Adjusting speaker volume, Patron counting, To adjust speaker volume
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9900 Series specifications

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