SafePass LD113 & LD213 Safety Loop Detectors

The small size of the LD113 and LD213 loop detectors with its 4 screw fixing points make them ideal for mounting in confined spaces. A large number of functions can be incorporated into a small package with the use of its microprocessor and surface mount technology.


The LD113 is a single channel inductive loop detector whilst the LD213 is a dual channel. They are designed for parking and access control applications and are most often used to open or close boom gates, doors or sliding gates.  With a very fast response time of 120ms the loop will provide an excellent safety feature for even the fastest doors and parking boom gates.

Loop detectors are most often used to open or prevent the closing of boom gates, doors or sliding gates.

The detector is connected to an inductive wire loop mounted in the road surface.  When vehicles pass over the loop the detector switches an output. The eight sensitivity settings and ASB (automatic sensitivity boost) offer enough flexibility to detect small cars and high bed trucks.

LD113 & 213 Safety Loop Detectors include the following features

  • Reset Switch: The reset switch enables the detector to be manually reset during commissioning and testing. This results in the detector re-tuning the sensing loop and becoming ready for vehicle detection.
  • Selectable Pulse Time: This feature sets the length of time that the pulse relay will be energised for 0.1 second or 0.2 second.
  • Pulse Relay Selection: The Pulse relay may be configured to energise on detection of a vehicle or when the vehicle leaves the loop.
  • Sensitivity Boost: This feature sets the undetect level to maximum sensitivity and is used to prevent loss of detection of high-bed vehicles.
  • Switch Selectable Sensitivity: Eight sensitivity settings are available on the switches to allow flexibility in configuration.
  • Switch Selectable Frequency: Two frequency settings are available to prevent cross-talk between adjacent loops.
  • Filter Option: This option is used to provide a delay between detection of the vehicle and switching of the output relay. This delay is normally used to prevent false detection of small or fast moving objects.
  • Permanent Presence Option: This feature ensures detection of the vehicle will be maintained when the vehicle is parked over the loop for extended periods.


Available with the LD213B Series Only

  • Selectable N/O or N/C relay output: Internal jumpers enable the output relay contacts to be configured for normally open or normally closed contacts.
  • Direction Logic: This feature enables the detector to give a pulse output on relay1 for a vehicle traveling from loop1 to loop2 and a pulse output on relay 2 for a vehicle traveling from loop2 to loop1.


For more information download our product datasheet.


Specification LD113B & LD213B Compact Loop Detectors
Power Requirement 10 – 50 VDC 60 mA       8 – 35v VAC 50/60Hz
Presence / Pulse relay 0.5A/220VAC
Indicators LED indicators show:  Power, Detect state and
Loop Fault
Detector Tuning Range 15 – 1500 uH
Frequency Two step adjustable 23—130kHz
Sensitivity Settings 1  – 0.01 %    HIGH
2 – 0.02 %
3 – 0.05 %
4 – 0.1 %
5 – 0.2 %
6 – 0.5 %
7 – 1 %
8 – 2 %         LOW
Protection Loop isolation transformer, zener diode and gas discharge tube
Environmental Tracking Automatic compensation
Response Time 120ms after vehicle enters the loop
Connector LD 113B: 10Way Screw terminal

LD 213B: 14Way Screw terminal

Operating Temperature -20°C to 70° C


For more information download our product datasheet.



For information about installation and operating instructions please download our PDF.