NorthStar NP2-240 Single Channel Dual Relay Vehicle Loop Detector, 240 VAC
The NorthStar NP2-240 is the 240 VAC version of the NP2 single channel vehicle loop detector family. It is used with an in-ground inductive loop to detect the presence of a vehicle and send relay signals back to a gate operator, barrier gate, or access control panel. This model is most often selected when the control enclosure already has 240 VAC detector power available and the system needs dry-contact style relay outputs for loop functions such as open, safety, reverse, shadow, or hold-open. The NP2 platform is a stronger choice than a basic detector when the installer wants front-panel diagnostics, selectable sensitivity, loop frequency adjustment, output timing, and automatic sensitivity boost for high-bed vehicles. Correct voltage matters on this item; a 240 VAC NP2 should not be substituted for a 120 VAC or low-voltage NP2 detector just because the detector body looks similar.
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 gate operators, barrier gate operators, parking control panels, access control systems, and traffic control cabinets that accept a standard 11-pin dual relay loop detector and provide 240 VAC detector power. Common applications include commercial slide gate operators, swing gate operators, barrier arms, parking gates, hold-open loops, safety/reverse loops, center loops, and free-exit loops when the operator control board supports relay loop input wiring. Verify the operator voltage, socket wiring, relay contact requirements, and loop function before ordering.
Features & Specifications
| Manufacturer | NorthStar Controls |
|---|
| Product Type | Single channel dual relay inductive vehicle loop detector |
|---|
| Part Number | NP2-240 |
|---|
| 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 | 240 VAC / 200 to 270 VAC input |
|---|
| Connection | 11-pin plug-in detector base or compatible harness |
|---|
| Output | Dual relay outputs, commonly listed up to 7A at 277 VAC / 30 VDC |
|---|
| Sensitivity | 10 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
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 NP2-240 used for?
The NP2-240 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 NP2-240 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 NP2-240 require?
This model is listed for 240 VAC / 200 to 270 VAC input. Confirm the voltage available in the operator control box before installing a replacement detector.
Can the NP2-240 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 NP2-240?
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.
