I don't have the manual handy but on my model for sure the transmission is not every 7 seconds when the pressure is nominal. I know this because I plug in the panel and then screw on the sensors. It takes quite a while (way more than 7 seconds) to get the first reading.
However, when the sensors detect a significant drop in pressure (note clever use of word significant instead of a number because I don't have the manual) the transmission rate increases dramatically. I know this because a) I read it in the manual and b) I unscrewed the sensors while the panel was still plugged in. It took no time at all to get the alarm.
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