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Hi I have just replaced my battery in the main control tested the internal pir via a walk through test panel code and my external sounder via the strobe test code. All worked fine but when I set the alarm and enter the house although the internal sounders go off the external bell box neithe...

I have a scantronic 9800 home intruder alarm systemand I want to replace the pir. Could anyone advise me what would be a suitable replacement please Thanks Ted