Reno A&E B-3 11-Pin Single Channel Loop Detector, 120VAC
The B-3 is a practical service replacement for older Reno Model B 120VAC loop detector installations. In a gate operator cabinet, the detector normally plugs into an 11-pin socket and monitors one saw-cut or preformed loop in the driveway. When a vehicle is detected, the relay output can be used by the operator as an open command, presence hold, safety input, or access-control call depending on how the system is wired. Because the B Series uses internal switches, installers should record the old detector settings before removal and duplicate only the settings that apply to the site. A B-3 should be selected when the original system is powered for 120VAC detector operation and needs the Model B output behavior.
Compatible With
This detector may be used with the following applications when the original voltage, connector style, output logic, and control-board documentation match:
- Reno A&E B-3 120VAC Model B detector installations.
- Select 120VAC detector sockets in gate operators, parking controllers, barrier gates, and access-control cabinets.
- Applications using one loop channel with relay output logic for exit, safety, presence, or call functions.
- Older Model B installations where B-3 or B-1 120VAC references appear in the parts documentation.
- Related searches include B-3, B3, B-1, BX-3, AX-3, SKT-11, and 802-4 when voltage and socket wiring match.
Features and Specifications
| Manufacturer | Reno A&E |
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| Product Type | Model B single channel vehicle loop detector |
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| Part Number | B-3 / B3 |
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| Application | Vehicle loop detection for 120VAC gate and access systems |
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| Input Power | 120VAC Model B version |
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| Channels | 1 loop channel |
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| Outputs | Model B relay output family - verify wiring |
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| Connector | 11-pin Amphenol-style rear connector |
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| Sensitivity | Eight sensitivity levels |
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| Loop Frequency | Selectable operating frequencies |
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| Notes | Internal DIP switches; record original settings before replacement |
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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: 120VAC Model B version.
- Verify the connector style and pin layout before ordering: 11-pin Amphenol-style rear connector.
- Confirm the required output style for the operator input: Model B relay output family - verify wiring.
- 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 B-3 the 120VAC Model B detector?
Yes. B-3 is the 120VAC version and should be matched to 120VAC detector power.
Can I replace B-3 with B-4?
No, not directly. B-4 is the low-voltage version and should not be installed in a 120VAC socket.
Why are the internal DIP switches important?
They control sensitivity, frequency, presence or pulse behavior, and related output functions. The replacement should be configured for the same loop job.
What applications use a B-3 detector?
Common applications include exit loops, safety loops, presence loops, parking access lanes, and barrier gate vehicle calls using compatible wiring.
Can a bad loop make the B-3 fail light come on?
Yes. Open loops, shorted loops, poor splices, water intrusion, or sudden loop inductance changes can trigger loop-fail indications.
