Diablo Controls DSP-40S Loop Detector

Diablo Controls ITEM: DSP-40S
Diablo Controls DSP-40S Loop Detector

Diablo Controls DSP-40S Loop Detector

Diablo Controls ITEM: DSP-40S
Regular price $85.00
  • Free shipping on most items over $200
  • We have 15+ years of industry experience
  • GSA, Net 30 and purchase orders available
Shipping calculated at checkout.


Loop detector 

  • Plug-N-Play for most installations.
  • Wide DC voltage operation (8 to 35).
  • Fail safe operation.
  • Designed to be cross talk free between other loops.
  • Separate Power/Fail and Detect LEDs.
  • Works on any in-ground inductive loop from 20 to 1500 microhenries.
  • Small profile is perfect for many installations.
  • This series of Diablo Controls detectors are covered by United States Patent number 7,132,959 “Non-Interfering Vehicle Detection.”

LED Indicators: The green Power LED will be on steady to indicate the detector is operating and powered. The red Detect LED will turn on when a vehicle is over the loop detection area.

Detect Memory: Power interruptions of short duration are ignored. If power fails for approximately 1 ½ seconds or less the detector “remembers” a vehicle.

Sensitivity and Reset Push Button: The Reset/Sens. button is used for two functions. A short press and release of the button will reset the detector and the LED’s will both flash from 1 to 4 times, indicating the detector’s sensitivity level. The detector is shipped from the factory with the sensitivity set at level 3. If a different sensitivity level is required push and continue to hold the button until the LED’s start flashing. Release the button immediately after the desired number of flashes. For example, if the sensitivity is to be changed to level 2, push and hold the button until the LED’s flash twice then immediately release the button. The sensitivity level can always be verified by a quick tap on the push button. This will reset the detector and flash the two LED’s indicating the present level.
Level 1 – Very Low
Level 2 – Low
Level 3 – Normal (Factory setting)
Level 4 – High

Loop or Wire Failures: In the case of a loop circuit failure, the green LED flashes slowly (twice per second) for an open loop circuit failure. The green LED will flash fast (10 times per second) to indicate a shorted loop circuit.

Fail Safe vs Fail Secure: A fail safe detector will output “detect” when the loop circuit is failed. This is always useful on a safety loop. On the free exit loop this will keep the gate open until the situation is fixed. This is useful in applications where it is important to allow traffic flow to continue. A fail secure detector will never output “detect” when the loop circuit is failed. This will keep the gate closed. This is useful in high-security areas or installations where containment is needed. The DSP-40S is a fail safe detector. Note: Never use a fail secure detector on a safety loop.
Outputs: Solid-state (open transistor collectors) for both detect and fail outputs. 30 mA maximum current sink- transient voltage protected.

Power: 12 to 30 volts DC

Operating Temperature: -35°F to 165°F (-37°C to 74°C)

Size: Height: 2.4″ Width: 0.8″ Depth: 2.25”

10-position Molex Type 09-48-1104
Mates with many female PCB 0.156” pitch headers in use by some access control devices and gate operators.

1: Loop input
2: Loop input
3: Power* (10 to 30 volts AC or DC)
4: No Connection
5: No Connection
6: Fail output -connects to common for fail.
7: Fail output -connects to common for fail.
8: Detect output -connects to common for detect.
9: Power* (10 to 30 volts AC or DC)
10: Power Common
*Either or both of these pins can be used to supply power to the detector.

All in stock orders typically ship the same business days or within 1-2 business days.  Cut off for same day shipping is 2:30PM Central Time.


Items with lead times typically ship in 4-7 business days.


Orders with free shipping may have longer lead times due to those items being shipped the most economical way.  Free shipping on most orders over $195.00 does not include gate operators, loop sealant, and any extreme length or weight items

Our return policy lasts for only 30 days. If 30 days have gone by since your purchase, unfortunately we can’t offer you a refund. Some items such as Gate Operators or custom parts may not be returnable or carry a restocking fee if returned.

Read return policies

Protec Controls accepts purchase orders please contact us.

NET 30

We also support Net 30 terms on our website for easy ordering. Please fill out the form to the right with your company information and we will get your account setup to place Net 30 orders.


Protec Controls accepts GSA SmartPay cards along with all major credit cards. For government quotes and purchase orders please email govsales@proteccontrols.com

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.