NorthStar NP2-C Single Channel Dual Output Plug-In Vehicle Detector
The NorthStar NP2-C is a compact single channel plug-in vehicle detector built for parking and access control work where a dual-output detector is needed in a smaller plug-in format. It watches a connected inductive loop and provides output back to the control board for presence, pulse, or fault-related loop functions depending on the switch settings and wiring. Compared with the standard NP2 11-pin box detector, the NP2-C has its own form factor, output layout, and power-version considerations, so it should be matched carefully to the original detector or the control panel documentation. It is commonly used where a small access control enclosure needs a plug-in loop detector with selectable sensitivity, multiple frequency settings, automatic sensitivity boost, and visible power/fault/detect indication. Correct socket and voltage confirmation are the big ordering points for this part.
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 parking/access control operators and gate operator control panels that accept the NP2-C plug-in detector layout and matching supply voltage. Commonly associated with radio-control compatible access control systems, small-loop parking applications, dual-output vehicle detection inputs, fail-safe or fail-secure loop functions, and relay-based loop wiring. Verify the NP2-C socket, harness pinout, power version, and desired output mode because it is not the same physical detector as the standard 11-pin NP2 box detector or the compact NP2-ES style detector.
Features & Specifications
| Manufacturer | NorthStar Controls |
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| Product Type | Single channel dual output plug-in vehicle loop detector |
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| Part Number | NP2-C |
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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 | 24 VAC or 120 VAC versions are commonly referenced; verify exact supply version |
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| Connection | Plug-in detector base or compatible harness, commonly associated with 10-pin style wiring |
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| Output | Two relay outputs; output rating commonly referenced at 5A, 277 VAC / 24 VDC |
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| Sensitivity | 8 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-C
- NP2C
- NorthStar NP2-C
- NorthStar-NP2-C
- 71-416-XNH
- NP2-C 71-416-XNH
- NP2-ES
- NP2-ESL
- NP2 family
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-C used for?
The NP2-C 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-C 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-C require?
This model is listed for 24 VAC or 120 VAC versions are commonly referenced; verify exact supply version. Confirm the voltage available in the operator control box before installing a replacement detector.
Can the NP2-C 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-C?
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.
