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Sensor SD2 smoke alarm contact closure

Discussion in 'Environment Monitors' started by John K, Sep 9, 2019.

  1. John K

    John K New member

    I'm wondering if your SD2 Smoke alarm...
    a) A contact-closure type of device
    b) Does it go down to Zero Ohms (or close to zero) when an alarm is triggered
  2. Chris R

    Chris R Member

    Hello John,
    Yes the SD2 is a contact closure type device.
    Yes it will go to zero

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