Product Overview
The NorthStar NP2-ES is a compact low-current plug-in loop detector for gate, parking, and access control systems. It is designed for applications where the operator control board provides low-voltage detector power and expects solid-state detect/fail output rather than a traditional dual relay detector. The NP2-ES monitors the connected loop and gives the gate or parking controller a vehicle detection signal for functions such as opening, holding, reversing, or confirming presence. It is a practical replacement choice when the original detector is an NP2-ES or the control board specifically calls for this low-profile plug-in style. Because it uses a different connection and output style than the standard NP2 relay detector, the installer should match the old part number, socket, voltage, and output requirements before swapping it into the panel.
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 modern gate operators, parking/access control systems, and low-voltage plug-in detector locations designed for the NP2-ES style compact detector. It is commonly used where the control board needs low-current solid-state detect/fail outputs instead of a larger relay detector. Applications may include access control gates, parking gates, operator loop inputs, exit loops, reverse loops, and vehicle presence inputs when the socket, voltage, and output type match. Verify the detector socket, 10-30V AC/DC power, output wiring, and fail/detect input requirements before replacing an older detector.
Features & Specifications
| Manufacturer | NorthStar Controls |
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| Product Type | Single channel dual output low-draw plug-in vehicle loop detector |
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| Part Number | NP2-ES |
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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 | 10 to 30V AC/DC, 5mA nominal |
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| Connection | Compact plug-in detector with 10-position Molex-style connection |
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| Output | Solid state detect and fail outputs, 30mA maximum current sink |
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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-ES
- NP2ES
- NorthStar NP2-ES
- NorthStar-NP2-ES
- NP2 ES
- NP2-ES Plus
- NP2-ESP
- NP2-C
- NP2-ESL
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-ES used for?
The NP2-ES 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-ES 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-ES require?
This model is listed for 10 to 30V AC/DC, 5mA nominal. Confirm the voltage available in the operator control box before installing a replacement detector.
Can the NP2-ES 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-ES?
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.
