Diablo Controls DSP-40S Plug-In Vehicle Loop Detector
The DSP-40S is a plug-in Diablo vehicle detector intended to simplify replacement in systems that already use a compatible plug-in detector connection. It senses vehicles through a standard inductive loop and provides a detect signal back to the gate or parking controller. The adjustable sensitivity levels make it useful when the loop size or site conditions require tuning, while the low-voltage operating range gives it flexibility in many access-control cabinets. Correct fitment is based on the installed connector and circuit, not only the detector brand. If the original system uses an 11-pin socket, terminal-block detector, DoorKing-specific plug-in detector, or mini-loop/probe detector, another Diablo model may be the proper match. Field conditions such as damaged loop wire or electrical noise can also cause detection trouble that a new detector will not solve.
Compatible With
- Select gate operators, parking controls, and access-control systems with a compatible plug-in detector connection
- Standard in-ground inductive loop applications
- Low-voltage control circuits that match the detector power requirements
- Free-exit, safety, shadow, presence, hold-open, or arming inputs when supported by the connected equipment
- Replacement applications where the original detector plug and output configuration match DSP-40S
Features and Specifications
| Manufacturer | Diablo Controls |
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| Product Type | Plug-in vehicle loop detector |
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| Part Number | DSP-40S |
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| Application | Vehicle loop detection for gate, parking, and access-control systems |
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| Compatible Operator Type | Equipment with compatible plug-in detector connection |
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| Voltage | Low-voltage AC/DC operation; verify system requirements |
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| Sensitivity | 4 selectable sensitivity levels |
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| Loop Type | Standard in-ground inductive loop |
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| Notes | Verify plug format before replacing another detector |
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Also Known As / Related Part Numbers
- DSP-40S
- DSP40S
- DSP-40 S
- DSP 40S
- Diablo plug-in vehicle detector
- Diablo Controls DSP-40S loop detector
Technician Note
Match the detector to the original part number, voltage, connector style, loop function, and output behavior. If a detector still shows a loop fault after replacement, test the loop and lead-in wiring before assuming the new detector is defective.
Before Ordering Checklist
- Confirm the exact Diablo Controls part number on the old detector or supplier record
- Verify the control voltage available at the detector connection
- Confirm the connector style, terminal layout, or plug-in board port
- Check whether the loop function is exit, safety, shadow, arming, hold-open, or presence
- Inspect loop resistance, lead-in splices, and water intrusion if the original detector failed
Professional Advisory
Loop detectors are vehicle-detection accessories and must be installed as part of a code-compliant gate or access-control system. Do not bypass required monitored photo eyes, monitored safety edges, or other entrapment-protection devices. For high-voltage wiring, unsafe gate movement, or repeated loop faults, use a qualified gate technician.
Important Ordering Warnings
Similar Diablo detector numbers may not be interchangeable. Pay close attention to fail-safe versus fail-secure operation, low-voltage versus line-voltage power, terminal-block versus plug-in construction, and standard loop versus mini-loop/probe operation.
Product Questions and Answers
Is the DSP-40S an 11-pin detector?
No. It is a plug-in detector, but not every plug-in detector uses the same connector. Compare the original detector and control-board connector before ordering.
Can the DSP-40S be used with a standard loop?
Yes. It is intended for standard in-ground inductive loop detection when the loop circuit is within the supported range.
Does the DSP-40S work with Diablo mini-loops?
Do not assume that. Mini-loop/probe use is tied to specific Diablo detector models, so verify the detector model and application before ordering.
What are common replacement symptoms?
Loop fault indication, no vehicle detection, false detection, or intermittent detect calls can point to the detector, but the loop and lead-in should be tested first.
Can this detector replace any other Diablo plug-in model?
No. Similar Diablo plug-in models can differ in power, outputs, connector style, fail mode, and probe compatibility.
