Jump to content
Security Installer Community

Optima G4

Recommended Posts


I installed a optima G4 in place of existing faulty alarm. As it was only a basic system I upgraded the system by installing additional PIRs. The PIrs are honeywell Activ8 and have a internal built in resistance on the alarm contacts of 17 ohms giving approx 20 Ohms on the loop.            Also I installed 2 PIrs in series for zone 2 to allow entry/exit inhibit for front door and side door, this doubling the loop to 39 Ohms. The manual does not mention zone resistance and the diagrams just show N/C contacts. Is there a max resistance on the input zones?                     Door entry and window contacts are just a few  ohms wire resistance.

Link to comment
Share on other sites

There will be a resistance threshold for closed loops but the lower the better, usually it's around 100-200 which you don't want to be near, but will vary on panel.

Issue is diagnosing future issues when you have multiple devices on a circuit, as above.

Link to comment
Share on other sites

Thanks for the replies, i know it was not ideal using 2x pirs in series. But I can free up a zone (Window contacts) and connect PIR in that room in series with the window contact, therefore ie zone 4 PIR+ window contact . That would allow the entry/exit zones to have their individual PIR (Timed). I was more concerned about the loop resistance. All loops then would be in the 20-22 Ohm range, except for door entry

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Recently Browsing   0 members

    • No registered users viewing this page.
  • Create New...

Important Information

By using this site, you agree to our Terms of Use.