Product Overview
The BASE LD-1250S-LV is a low-voltage single channel programmable dual-relay DEFLECTOMETER loop detector built for vehicle detection in automated gate, parking, barrier-arm, and access-control work. The detector connects to an inductive loop installed in the pavement and changes relay state when a vehicle enters the loop field. In a gate system, that signal may be used for free exit, safety/reverse protection, shadow loop hold-open, arming a keypad or reader, preventing a barrier arm from lowering on a vehicle, or supporting parking-control logic. The LD-1250 series is used when one loop needs more flexible relay handling than a basic detector. The programmable dual relay design can support applications such as presence plus pulse, auxiliary output, or specialized gate and parking logic when the controller wiring is set up for it. The important ordering point is that loop detectors are not selected by connector shape alone. The supply voltage, fail-safe or fail-secure output behavior, relay function, loop condition, and controller wiring all have to match the job. A similar-looking low-voltage, high-voltage, or S-series detector may not behave the same when power is removed or when a loop fault occurs.
Compatible With
This item is commonly used with the following applications when the voltage, wiring, relay function, and site configuration match:
- 10-40 VDC or 14-35 VAC low-voltage power gate, barrier gate, parking, overhead door, access-control, and vehicle-detection installations that accept an external 11-pin inductive loop detector
- saw-cut loops, preformed loops, direct-burial loops, loop extension cable, and properly twisted loop lead-in wiring within the detector inductance range
- single-loop applications needing separate detect/pulse, presence, or auxiliary relay output handling
- fail secure control circuits when the site safety design calls for that relay behavior
- 11-pin detector sockets, 11-pin plug-in detector bases, and harnesses such as BASE LMH6-11 where the pinout and operator wiring match
- replacement or upgrade applications where an LD-1250, LD-1250-LV, LD-1250-HV, LD-1250S-LV, LD-1250S-HV, LMA-1250, or related BASE/EDI style detector is specified and the voltage/fail mode matches
Features & Specifications
| Manufacturer | Base Loop Detectors |
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| Product Type | single channel programmable dual-relay DEFLECTOMETER loop detector |
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| Part Number | LD-1250S-LV |
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| Application | Vehicle detection for gate, barrier, parking, access-control, and door control systems |
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| Compatible Operator Type | Systems accepting an external 11-pin inductive loop detector |
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| Voltage | 10-40 VDC or 14-35 VAC low-voltage power |
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| Output | programmable dual relay output |
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| Relay Behavior | fail secure |
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| Loop Type | Inductive vehicle loop with proper lead-in cable |
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| Connector | 11-pin rear connector / compatible 11-pin detector socket or harness |
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| Diagnostics / Setup | front-panel 7-segment DEFLECTOMETER, 10 sensitivity levels, programmable dual relay outputs, frequency display, loop fault monitoring, loop fault memory, call output memory, four frequency levels, and sensitivity boost |
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| Notes | Match voltage, fail-safe/fail-secure behavior, relay contact, and pinout before replacement |
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Also Known As / Related Part Numbers
LD-1250S-LV, BASE-LD-1250S-LV, LD1250SLV, BASE LD-1250S-LV, LMA-1250S-LV, EDI LMA-1250S-LV, LMA 1250S-LV
Technician Note
Most loop detector trouble calls are caused by loop or lead-in problems, wrong voltage, a wrong relay contact, or replacing a fail-safe model with a fail-secure model. Confirm the field wiring before assuming the detector is the only failed part.
Before Ordering
- Verify the exact part number on the existing detector or project parts list.
- Confirm low-voltage versus high-voltage power before applying power.
- Confirm fail-safe or fail-secure relay behavior required by the operator.
- Check the loop and lead-in cable for opens, shorts, damaged insulation, or wet splices.
- Confirm the 11-pin socket or harness pinout and relay contact wiring.
- Do not bypass required safety devices or leave a gate operating unsafely after detector replacement.
Professional Advisory
Loop detector wiring can involve gate operator control circuits and, on some models, line voltage. If the power source, relay behavior, or safety function is unclear, have the system checked by a qualified gate or access-control technician.
Product Q&A
What is the BASE LD-1250S-LV used for?
The BASE LD-1250S-LV is used with an inductive roadway loop to detect vehicles for gate, barrier, parking, access-control, and similar operator control applications.
Will the BASE LD-1250S-LV work with any gate operator?
It may be used with many gate and access-control systems that accept an external 11-pin loop detector, but the voltage, relay output, fail mode, and pinout must match the operator wiring.
What voltage does the BASE LD-1250S-LV require?
This model is intended for 10-40 VDC or 14-35 VAC low-voltage power. Do not substitute a low-voltage and high-voltage version without checking the operator power source and wiring diagram.
What does the S version mean on the BASE LD-1250S-LV?
The S version is associated with fail-secure relay behavior. It should be used only when the gate or access-control design calls for that output behavior.
Why would I choose this detector instead of a basic single-output detector?
This model is commonly used when the loop signal needs additional relay handling, such as separate presence, pulse, or auxiliary output logic, depending on the controller wiring.
Can this detector be used for safety loops?
Yes, it may be used for safety or reverse loop functions when installed and wired correctly. Never bypass monitored safety devices or rely on a detector to cover an unsafe gate condition.
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