Diablo Controls DSP-15T Parking/Access Control Detector Vehicle Loop Detector
The Diablo Controls DSP-15T is a full-feature single-channel vehicle loop detector made for parking, drive-through, barrier gate, and access-control applications. It is used with one in-ground inductive loop to tell the connected control equipment when a vehicle is present over the loop.
This style of detector is a good choice when the installation needs more adjustment capability than a basic switchless microdetector. The DSP-15 family includes automatic loop tuning, HYPERTRACK environmental compensation, selectable sensitivity, fail-safe or fail-secure operation, and LED fault/detect feedback that helps a technician identify loop, wiring, or detection issues at the cabinet.
Correct fitment depends on more than the part number. The detector must match the available supply voltage, terminal or socket wiring, desired relay behavior, presence or timing needs, and the condition of the loop in the pavement. If the loop is open, shorted, too noisy, or outside the expected inductance range, replacing the detector alone may not correct the problem.
Compatible With
Compatibility depends on the detector model, supply voltage, loop or probe type, wiring base, relay output needs, and how the gate, door, barrier, parking, or access-control panel is designed to receive a vehicle-detect signal.
- Parking access control lanes using one in-ground inductive loop
- Barrier gate operators and parking gates that accept a relay output from a loop detector
- Commercial overhead door or dock control systems that use loop-based vehicle presence detection
- Drive-through, card reader, ticket dispenser, and access-control lanes requiring vehicle detect input
- Inductive loops in the 20 to 2000 microhenry range when the loop and lead-in are in usable condition
- Installations replacing or cross-referencing DSP-15 family detectors where voltage and wiring match
- Not a direct replacement for dual-channel detectors, probe-only systems, AVI receivers, or safety photo eyes
Features and Specifications
| Manufacturer | Diablo Controls |
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| Product Type | Single-channel vehicle loop detector |
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| Part Number | DSP-15T |
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| Application | Parking, drive-through, barrier gate, and access-control vehicle detection |
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| Loop Type | One in-ground inductive loop |
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| Loop Inductance | Commonly used with 20 to 2000 microhenry loops |
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| Output / Operation | Vehicle detect relay output; selectable fail-safe or fail-secure configuration |
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| Adjustment | Automatic tuning, selectable sensitivity, delay/extension functions depending on setup |
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| Indicators | Power/fail and detect status LEDs |
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| Notes | Verify supply voltage, wiring format, loop condition, and relay behavior before ordering |
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Also Known As / Related Part Numbers
- DSP-15T
- DSP-15
- DSP15T
- DSP15
- Diablo DSP-15 vehicle detector
- Diablo DSP-15 loop detector
- DSP-15 parking detector
- DSP-15 access control detector
Technician Note
If the detector shows loop fault, check the loop and lead-in before assuming the detector has failed. Open loops, shorted loops, water intrusion, poor splices, and electrical noise can make a good detector appear defective.
Before Ordering
- Confirm the existing detector part number and voltage.
- Confirm the cabinet uses a single-channel loop detector, not a dual-channel or counting detector.
- Check whether the job needs fail-safe or fail-secure relay behavior.
- Verify the loop is not open, shorted, or physically damaged.
- Match the terminal wiring and output contacts before powering the replacement.
Important Ordering Warning
Do not use this detector as a replacement for a monitored entrapment-protection device. A vehicle loop may be part of a safety or hold-open strategy, but it is not a substitute for required monitored photo eyes, safety edges, or other UL 325 safety devices.
Professional Advisory
Vehicle detector wiring is part of the gate, door, parking, or access-control safety and command circuit. Do not bypass monitored safety devices or use a detector to defeat required entrapment protection. For high-voltage wiring, cabinet faults, nuisance detection, or unsafe gate movement, use a qualified gate or access-control technician.
Product Questions and Answers
What type of loop does the DSP-15T work with?
The DSP-15T is used with a single in-ground inductive loop, commonly in the 20 to 2000 microhenry range when the loop and lead-in wiring are in good condition.
Can this be used for a gate or parking barrier?
Yes, it is commonly used in parking, access-control, barrier gate, drive-through, and similar vehicle detection applications where the controller accepts a detector relay output.
Is DSP-15T the same as every DSP-15 listing?
DSP-15T is commonly searched with DSP-15, but the exact voltage, wiring style, and stocked version should be matched before ordering.
Will replacing the detector fix a loop fault?
Not always. If the loop is open, shorted, water damaged, or noisy, the loop or lead-in may need repair before the detector can operate reliably.
Is this a monitored safety device?
No. It is a vehicle loop detector and should not be used to bypass or replace required monitored safety devices.
