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[Solved] Where can I buy a PIR sensor with a bipolar/NO contact lead?

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Where can I buy a PIR motion sensor with an isolated NO relay contact, powered from 230V AC, and with an adjustable delay of several minutes?

Use a standard 230V AC PIR detector with a built-in relay and add an external relay with a 230V coil if you need isolated NO contacts without modifying the sensor internals [#18330184][#18330258] One reply also pointed to the DSC LC 100 as a possible model, but it was later noted that it does not have an NO operating mode [#18329688][#18332321] Another linked example was suggested, but it was confirmed not to have an independent contact either [#18332328][#18332693]
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  • #1 18329684
    Anonymous
    Level 1  
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  • #2 18329688
    kood
    CCTV and Stationary Alarms specialist
    Posts: 1896
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    101pawel wrote:
    or though NO.
    .

    E.g. DSC LC 100
  • #3 18329731
    Anonymous
    Level 1  
  • #4 18330138
    CYRUS2
    Level 43  
    Posts: 17639
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    101pawel wrote:
    Hello,
    - I am urgently looking for a motion detector (PIR) with a bipolar or at least NO pin out.
    What is a pin out ?
    Why does a colleague need this contact ?
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  • #5 18330184
    jurand87sca
    Level 31  
    Posts: 1562
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    With a little modification any detector from the factory with a relay and powered by 230VAC could have a switchable contact? Just change the output relay to a single switchable contact and undo the middle contact from the "Line" wire Would that be too easy?
  • #6 18330220
    Anonymous
    Level 1  
  • #7 18330258
    jdjan1
    Level 26  
    Posts: 470
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    Welcome!

    So let it control an additional relay with a 230V coil and you have the contacts you want, if you do not want to interfere with the inside of the finished sensor.

    Greetings


    Jan
  • #8 18330264
    Anonymous
    Level 1  
  • #9 18331938
    kosmos99
    Level 38  
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    And one used for halogen lamps?
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  • #10 18332197
    CYRUS2
    Level 43  
    Posts: 17639
    Help: 1221
    Rate: 3448
    101pawel wrote:
    I am simply looking for a sensor that has, without any interference whatsoever, to share a contact separate from the sensor supply.
    Why should people waste their time pointlessly analysing a misplaced problem.
    After all, a colleague knows such a sensor just doesn't want to pay what the seller wants for it.
  • #11 18332228
    Anonymous
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  • #12 18332321
    van claude jean damme
    Level 19  
    Posts: 308
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    Rate: 76
    kood wrote:
    DSC LC 100
    This detector has no NO operating mode.
  • #14 18332693
    Anonymous
    Level 1  
  • #16 18334385
    Anonymous
    Level 1  
  • #17 18338069
    Anonymous
    Level 1  

Topic summary

✨ The discussion revolves around the search for a PIR motion sensor with a bipolar or normally open (NO) contact lead, specifically one that operates on a 230V power supply and has adjustable settings with a minimum time delay of several minutes. Participants suggest that while such sensors may not be readily available, modifications to existing models could achieve the desired functionality. Some users mention specific models and links to potential solutions, but many express frustration over the difficulty in finding a budget-friendly option that meets the original specifications without requiring internal modifications. Ultimately, the original poster finds a suitable sensor and concludes the discussion.
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FAQ

TL;DR: Looking for a 230 V PIR with isolated NO/NC? Up to 30 minutes delay is standard; "choose a sensor with a potential-free relay contact." Use 4-wire units to keep contacts separated. [Steinel Control PRO IR Quattro Datasheet]

Why it matters: This FAQ helps electricians, integrators, and DIYers quickly find 230 V PIRs with dry contacts and long delays without hacks.

Quick Facts

What exactly is a 230 V PIR with a potential-free NO contact?

It is a mains-powered motion sensor with four terminals. Two feed the sensor with 230 V. The other two form an isolated “dry” relay contact you can wire as NO to any circuit. The contact is not tied to the mains line. [Elektroda, Anonymous, post #18330220]

Where can I buy one? Which brands or search terms help?

Search terms: “potential-free relay,” “dry contact,” “4-wire PIR,” “NO/NC,” and “230 V.” Pro series from Steinel Control PRO offer potential-free relays and long delays. Similar features appear in building-automation sensors from B.E.G. and Theben. Check datasheets for 230 V supply and dry contact. [Steinel Control PRO IR Quattro Datasheet]

Why won’t a typical floodlight PIR give me a dry contact?

Most floodlight PIRs switch the live conductor internally. Their output is not an isolated relay pair. You cannot use it as a floating signal for other circuits. Pick a unit explicitly stating “potential-free relay contact” or “dry contact.” [Elektroda, Anonymous, post #18332693]

I need only NO, not NC—can I get that and long delay?

Yes. Many pro sensors have a changeover relay (NO/NC). You can wire only the NO leg. Hold-time is typically adjustable from 5 s up to 30 min on pro models. Confirm “potential-free relay” in the datasheet. [Steinel Control PRO IR Quattro Datasheet]

How do I wire a 4‑terminal PIR with an independent contact?

  1. Connect L and N to the sensor’s 230 V supply inputs.
  2. Wire your load or control input across COM and NO of the dry relay.
  3. Set time and sensitivity, then test the contact closure on motion. [Steinel Control PRO IR Quattro Datasheet]

Can I add an external relay to a standard sensor to get isolated NO/NC?

Yes. Drive a separate 230 V coil relay from the sensor’s switched output to obtain dry NO/NC contacts. “Let it control an additional relay with a 230 V coil.” Ensure the relay matches your load rating. [Elektroda, jdjan1, post #18330258]

Should I modify a PIR internally to create a switchable contact?

It is possible by changing the internal relay and isolating the common contact from the line. However, it voids approvals and warranty, and risks safety. Prefer a factory sensor with a potential-free relay or use an external relay. [Elektroda, jurand87sca, post #18330184]

I need a several‑minutes delay—what are my options?

Select a pro-grade PIR with adjustable hold-time up to 30 minutes. These sensors expose “Time” settings and provide dry contacts. If you still need longer, follow it with a time-relay in your control panel. [Steinel Control PRO IR Quattro Datasheet]

Are low‑voltage PIR+timer modules a viable alternative?

They can work if you add a suitable power supply and interposing relay. Note some suggested modules run at 9–14 V and have short range and narrow angles. Verify voltage, range, and optics before buying. [Elektroda, Anonymous, post #18334385]

What keywords should I use to find suitable models?

Try: “potential-free relay,” “dry contact,” “NO/NC,” “4-wire PIR,” “zasilanie 230 V,” and “czas podtrzymania.” The key is four terminals: two for supply and two for the contact. [Elektroda, Anonymous, post #18330220]

Can the isolated contact drive PLC or low‑voltage logic safely?

Yes. A dry contact is floating. Wire COM and NO into your PLC’s digital input circuit per its wiring standard. Keep supply and contact isolated as designed. [Elektroda, Anonymous, post #18330220]

Do I need a neutral at the sensor location?

Yes. Four‑wire, 230 V sensors require both L and N for power. The other two terminals are the isolated relay contact. Plan cabling accordingly. [Elektroda, Anonymous, post #18330220]

Any caveats on range and field of view?

Not all PIRs are equal. Some compact or low‑voltage modules have limited range and narrow viewing angles. Check lens type, coverage angle, and stated detection distance before purchase. [Elektroda, Anonymous, post #18334385]
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