Reno A&E BX-4 Low Voltage Loop Detector, Replacement for BX-LP-24
The BX-4 is the low-voltage version of Reno A&E's BX single-channel detector family. It is designed to monitor one inductive loop and provide relay output signals to a connected gate operator, parking controller, or access-control system. In service work, BX-4 is often selected when an older low-voltage Reno detector has failed, when a detector needs dual output flexibility, or when the installer wants a field-proven 11-pin detector with clear LED diagnostics. The BX-4 can be configured for different vehicle detection jobs, but it is not a universal drop-in for every detector marked Reno. The original input power, fail-safe or fail-secure behavior, relay output use, and socket wiring must all be matched. For a discontinued BX-LP-24 installation, verify the label and wiring before treating BX-4 as the correct replacement.
Compatible With
This detector may be used with the following applications when the original voltage, connector style, output logic, and control-board documentation match:
- Discontinued Reno BX-LP-24 low-power detector applications when the replacement calls for BX-4.
- Reno BX-4 12/24V low-voltage 11-pin loop detector installations.
- Select gate operators, parking systems, access controllers, and barrier gates using compatible low-voltage detector power and 11-pin socket wiring.
- Exit loops, safety loops, presence loops, and vehicle call loops requiring one channel with dual output options.
- Common related references include BX-4, BX4, BX-LP-24, BXLP24, B-4, AX-4, SKT-11, and 802-4 depending on the original system.
Features and Specifications
| Manufacturer | Reno A&E |
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| Product Type | Single channel dual-output vehicle loop detector |
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| Part Number | BX-4 / BX4 |
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| Application | Low-voltage loop detection for gate, parking, and access control systems |
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| Input Power | Low-voltage 12/24V class BX model - verify label and wiring |
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| Channels | 1 loop channel |
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| Outputs | Dual relay output family |
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| Connector | 11-pin Amphenol-style detector socket |
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| Sensitivity | Eight selectable sensitivity levels |
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| Loop Frequency | Four selectable frequencies |
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| Notes | Uploaded item references discontinued BX-LP-24 replaced by BX-4; verify original voltage and fail behavior |
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Also Known As / Related Part Numbers
These numbers and search variations are related to this product family. They should not be treated as exact replacements unless the voltage, connector, and detector function are confirmed.
Technician Note
Loop detector problems are not always caused by the detector module. A damaged loop, wet splice, poor lead-in cable, wrong sensitivity setting, frequency interference, or a loop installed too close to moving gate steel can create false detection or missed vehicles. Match the detector first, then test the loop and operator input before returning the gate to service.
Before Ordering
- Match the detector input power to the original unit and operator control voltage: Low-voltage 12/24V class BX model - verify label and wiring.
- Verify the connector style and pin layout before ordering: 11-pin Amphenol-style detector socket.
- Confirm the required output style for the operator input: Dual relay output family.
- Check whether the original application uses presence, pulse-on-entry, pulse-on-exit, fail output, or safety/hold-open logic.
- Inspect loop wire, lead-in cable, splices, and pavement cuts before assuming the detector module is the only failed part.
Important Ordering Warnings
- Do not interchange 120VAC, 240VAC, and low-voltage detector models by appearance alone.
- Do not assume fail-safe and fail-secure versions are interchangeable.
- Confirm 11-pin socket detectors versus plug-in Molex style detectors before ordering.
- Check whether the application needs relay outputs or solid-state outputs.
Professional Advisory
Do not use a loop detector as a replacement for required monitored photo eyes, safety edges, or entrapment protection devices. For high-voltage detector power, damaged wiring, nuisance gate movement, or uncertain safety-device wiring, have the system checked by a qualified gate technician.
Product Questions and Answers
Is BX-4 the replacement for BX-LP-24?
BX-4 is commonly used as the replacement direction for BX-LP-24 low-voltage applications, but the original label, socket wiring, and fail-safe/fail-secure behavior should be checked.
What voltage is the BX-4 used for?
BX-4 is the low-voltage BX family model. Match it to the original 12/24V class detector power before ordering.
Does the BX-4 have two outputs?
The BX Series is commonly used as a single-channel detector with dual output capability, allowing presence, pulse, or fail-related output functions depending on setup.
Can this detector be used with a solar gate opener?
It may be used only if the operator supports the detector power draw and compatible wiring. For very low-power solar systems, confirm the current draw and control-board input first.
Should I change detector settings after installing it?
Yes. Sensitivity, frequency, output mode, delay, and presence behavior should be set to match the original loop function and site conditions.
