NorthStar NP2-ESL Single Channel Low Power Vehicle Loop Detector
The NorthStar NP2-ESL is a very low power single channel loop detector for gate, access control, and parking systems that need dependable vehicle detection without the current draw of a larger detector. It is often considered for battery-backed or solar-sensitive installations, compact control boxes, and panels that use screw terminal detector wiring instead of a plug-in detector socket. The NP2-ESL reads the buried loop and sends a detection output to the control board for the selected function, such as vehicle presence, exit, reverse, or hold-open. Its low current design, selectable sensitivity, frequency choices, automatic sensitivity boost, and fail-safe/fail-secure option make it flexible, but also make correct wiring verification important. Do not choose it only because the part number looks similar to NP2-ES; the connection method and output arrangement must match the application.
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-current, battery-backed, solar-assisted, parking, access control, and gate operator installations where a hardwired low-power detector is required. The NP2-ESL is commonly associated with applications that need screw terminal wiring instead of a plug-in socket, including compact control boxes, custom access panels, low standby-current gate systems, exit loops, reverse loops, and vehicle-presence inputs. Verify the needed output type, low-voltage supply, terminal wiring, and whether the system requires fail-safe or fail-secure behavior.
Features & Specifications
| Manufacturer | NorthStar Controls |
|---|
| Product Type | Very low power single channel vehicle loop detector |
|---|
| Part Number | NP2-ESL |
|---|
| Application | Vehicle detection for automated gates, parking gates, traffic control, and access control systems |
|---|
| Compatible Operator Type | Select gate operators, barrier gates, parking systems, and access controllers with matching detector power and input style |
|---|
| Voltage | 10 to 30V AC/DC, about 1mA nominal |
|---|
| Connection | Screw terminal connections for power, loop, and output |
|---|
| Output | Single output with selectable fail-safe / fail-secure behavior |
|---|
| Sensitivity | 4 selectable sensitivity levels |
|---|
| Frequency | 4 selectable loop frequencies |
|---|
| Inductance Range | Commonly 20uH to 1500uH on NorthStar NP2 family detectors; verify the exact data sheet for the installed model |
|---|
| Temperature Range | Commonly -30 F to +180 F on NorthStar detector references |
|---|
| Notes | Match by part number, voltage, socket or terminal style, output type, and control board loop function |
|---|
Also Known As / Related Part Numbers
- NP2-ESL
- NP2ESL
- NorthStar NP2-ESL
- NorthStar-NP2-ESL
- NP2 ESL
- NP2-ESL Plus
- NP2-ESLP
- NP2-ES
- NP2-C
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-ESL used for?
The NP2-ESL 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-ESL 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-ESL require?
This model is listed for 10 to 30V AC/DC, about 1mA nominal. Confirm the voltage available in the operator control box before installing a replacement detector.
Can the NP2-ESL 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-ESL?
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.
