NorthStar NP2+ Single Channel Dual Relay Vehicle Loop Detector, 12-24V AC/DC
The NorthStar NP2+ 12-24V AC/DC detector is the low-voltage Plus version of the NP2 single channel dual relay loop detector. It is used with an inductive loop in gate, parking, and access control systems that provide low-voltage detector power instead of 120V or 240V line voltage. The Plus platform is useful when the installer wants a digital display, loop diagnosis bar graph, multiple sensitivity settings, frequency adjustment, delay/extend options, and selectable presence or pulse behavior. This makes it a practical choice for new installations or replacements where troubleshooting information at the detector is valuable. Because it is a low-voltage model, it should be selected by the actual power available in the control box and by the required relay output function, not only by the NP2+ name.
Vehicle loop detectors are part of the control side of the gate system. They do not replace photo eyes, gate edges, or other monitored entrapment protection devices required by the operator and current safety standards. A loop detector should be wired only to the input function intended by the operator manufacturer.
Compatible With
Select low-voltage gate operators, solar or battery-backed access systems, barrier gates, parking control panels, and 11-pin detector sockets that need a 12-24V AC/DC single channel dual relay detector. Common applications include exit loops, reverse loops, safety loops, hold-open loops, center loops, and vehicle presence detection where the controller accepts relay contacts. The NP2+ 12-24V version is related to the NP2-12/24 family, but the installer should verify low-voltage power, relay contact requirements, current draw, and physical socket clearance.
Features & Specifications
| Manufacturer | NorthStar Controls |
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| Product Type | Single channel dual relay low-voltage vehicle loop detector with digital display |
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| Part Number | NP2+-1224V |
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| Application | Vehicle detection for automated gates, parking gates, traffic control, and access control systems |
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| Compatible Operator Type | Select gate operators, barrier gates, parking systems, and access controllers with matching detector power and input style |
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| Voltage | 12-24V AC/DC input |
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| Connection | 11-pin relay base socket or compatible wiring harness |
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| Output | Dual relay outputs for compatible loop inputs |
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| Sensitivity | 10 sensitivity settings with digital display / EZ Tune |
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| Frequency | 4 frequency settings |
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| Inductance Range | Commonly 20uH to 1500uH on NorthStar NP2 family detectors; verify the exact data sheet for the installed model |
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| Temperature Range | Commonly -30 F to +180 F on NorthStar detector references |
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| Notes | Match by part number, voltage, socket or terminal style, output type, and control board loop function |
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Also Known As / Related Part Numbers
- NP2+ 12-24V
- NP2+-1224V
- NP2 Plus 12-24V
- NP2 PLUS 12-24 VAC/DC
- NP2P-12-24AC-DC
- NP2P-1224
- NP2-12/24
- NP2-24
- NorthStar NP2+ 12-24V
Technician Note
When replacing a loop detector, do not assume that all NorthStar NP2-style detectors are interchangeable. The detector may share the same general product family while using a different voltage, socket, output type, or low-current connection style. If the loop has nuisance trips, no detection, or fault indications, check the loop and lead-in wiring before blaming the detector.
Before Ordering Checklist
- Match the exact part number from the old detector when available.
- Confirm detector supply voltage in the operator or access control enclosure.
- Check whether the system needs relay output, solid-state output, single output, dual output, or multiple loop channels.
- Verify the socket, plug, terminal strip, or harness style.
- Confirm the loop function: exit, reverse, safety, shadow, hold-open, center, or presence.
- Inspect the loop and lead-in for open, shorted, wet, or damaged wiring before replacing the detector.
Professional Advisory
Loop detector wiring should be handled with the gate operator powered down and according to the operator wiring diagram. For high-voltage detector power, damaged gate wiring, nuisance gate movement, or missing safety devices, use a qualified gate technician. Do not bypass safety inputs to make a detector or gate operator run.
Product Questions & Answers
What is the NP2+-1224V used for?
The NP2+-1224V is used with an inductive vehicle loop to send a vehicle detection signal to a compatible gate operator, parking gate, or access control panel.
Will the NP2+-1224V replace any NorthStar loop detector?
No. Match the original detector part number, voltage, socket or wiring style, output type, and the loop function. Similar NorthStar detector numbers can have different power and connection requirements.
What voltage does the NP2+-1224V require?
This model is listed for 12-24V AC/DC input. Confirm the voltage available in the operator control box before installing a replacement detector.
Can the NP2+-1224V be used for exit or safety loops?
It may be used for exit, reverse, safety, hold-open, or presence loop functions when the operator board supports that input and the detector output is wired correctly.
What should be checked before ordering the NP2+-1224V?
Check the old detector number, loop wiring, socket or terminal style, supply voltage, output contact type, and the gate operator wiring diagram. A qualified technician should handle unsafe wiring or high-voltage service.
