Hall Research VSA-51-R - Manual (Page 25)

Digital AV Room Control System
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2.8 VSA-PGSNS
The VSA-PGSNS is an optional kit to enable the Priority Page Sense Mute feature. It uses a non-invasive sensor that
monitors existing PA lines without having to splice into the wires. The sensor detects when the PA system is activated and
sends a signal to the VSA-51 to mute the audio. Once the PA line goes quiet the VSA-51 resumes audio.
VSA-PGSNS
2.8.1 Installation
1. To install the VSA-PGSNS, first locate the PA line.
2. You will need to isolate one of the wires from the pair to run through the sensor. Carefully separate the wire pair
taking caution not to sever the line or expose the wire inside the insulation.
3. Wrap one of wires around the sensor lid 2-3 times as shown below.
4. Connect the leads on the sensor to the VSA-51-R port labeled “page sense”. Connect white to SN (+) and black
to G (-).
5. Now that the sensor is installed it still needs to be calibrated for sensitivity. Refer to the software documentation
on how to adjust the VSA-PGSNS sensitivity.
NOTE
The optional Page Sensor works with 25 V or 70 V and even 4/8 ohm PA systems. It is not designed for,
two-way intercoms or IP-based paging systems. The sensor measures AC audio current going to the PA
speaker and compares it against a “set point” to ignore background PA system noise. The mute trigger
sensitivity is easily set using the web-based software from any PC, tablet, or smart phone.