NorthStar NP2-LM LiftMaster Compatible Plug-In Vehicle Loop Detector
The NorthStar NP2-LM is a plug-in vehicle loop detector built for compatible LiftMaster gate operator applications. It is a single channel detector that plugs directly into the LiftMaster-style detector connection on supported boards, reducing field wiring compared with a hardwired relay detector. The detector monitors an inductive loop and sends a detection signal to the operator for functions such as exit, safety/reverse, shadow, or hold-open, depending on which loop input the board uses. This part is commonly selected when an old plug-in detector has failed, when a lightning event damaged the loop detector, or when a new compatible LiftMaster system is being fitted with loop detection. It should not be treated as a universal detector for every LiftMaster product; the operator must have the correct detector socket and voltage support.
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 LiftMaster gate operators and LiftMaster commercial access control operator boards that accept the LiftMaster-style plug-in loop detector format. Commonly associated with loop detector replacement where the original detector is LiftMaster LOOPDETLM-style or a NorthStar NP2-LM style plug-in unit. Used for exit loops, safety/reverse loops, shadow loops, interrupt loops, and vehicle presence inputs when the LiftMaster control board supports that plug-in detector. Verify the exact LiftMaster operator model, board socket, detector voltage, and loop input function before ordering.
Features & Specifications
| Manufacturer | NorthStar Controls |
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| Product Type | Single channel single output LiftMaster-style plug-in vehicle loop detector |
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| Part Number | NP2-LM |
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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 to 24 VDC, commonly listed as 10 to 24V operating range |
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| Connection | LiftMaster-style plug-in connection |
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| Output | Transistor output, commonly referenced at 30mA at 24V |
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| Sensitivity | 4 selectable sensitivity levels |
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| Frequency | 4 selectable loop frequencies |
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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-LM
- NP2LM
- NorthStar NP2-LM
- NorthStar-NP2-LM
- NP2 LM
- LiftMaster plug-in loop detector
- LOOPDETLM related search
- LOOPDETLM-style detector
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-LM used for?
The NP2-LM 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-LM 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-LM require?
This model is listed for 12 to 24 VDC, commonly listed as 10 to 24V operating range. Confirm the voltage available in the operator control box before installing a replacement detector.
Can the NP2-LM 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-LM?
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.
