AR2500 Laser Sensor

AR2500 laser sensors are Acuity Laser’s ultra-compact rangefinder models. This eye-safe rangefinder has a measurement frequency of up to 30 kHz and can measure the distances to natural targets up to 30 meters away or to retroreflective targets 260 meters away. This laser is best for applications that demand high sampling rates.

Product ID: 3772 Category:

Fast Speed, Compact Design

Acuity’s AR2500 sensor uses time-of-flight measurement principles to measure long distances at short measurement intervals to provide precise accuracy at high sampling rates.

The ultra-compact AR2500 laser sensor can measure distances from 0.2 m (8 in) to 30 m (100 ft) to natural targets of low reflectance (10%). In simple sampling averaging modes, the AR2500’s typically achieves accuracy less than 10 mm throughout the measurement range. The sensor has a maximum sampling rate of 30,000 Hz, and at its furthest measurement ranges, the sensor’s sampling output rate is still able to be up to 16,000 Hz.

For very distant measurements, you can use retroreflective target material (such as 3M Scotch lite 3000X) to increase the maximum range to 260 meters (853 feet).

Class 1, Eye-safe Laser

The AR2500 laser sensor operates with a Class 1, eye-safe, 905 nm infrared diode. The tiny laser spot has a beam divergence of 3 milliradians. The Class 1 laser is able to be used in most environments and is FAA approved to be operated in outdoor applications near airports.

Versatile, High Speed Applications

The AR2500 sensor is designed for industrial environments with NEMA-6, IP67 enclosure ratings, making the sensor impervious to dust infiltration and moisture impregnation. Typical applications for the AR2500 include high-speed vehicle height profiling, bridge crane monitoring, trolley positioning and altitude measurements, amongst others. It’s high sampling rate and ultra-compact case make it ideal for industrial scanning applications and tight OEM installations applications.  For large-volume machine builder applications, a stripped-down module version of the sensor is offered for customers that intend to insert the sensor module into a larger housing.

Outputs and Inputs

You can choose a standard RS232 or optional RS422 serial interface for communication with a computer or PLC. The AR2500 also comes with a standard, 4-20 mA, analog, current loop output. The AR2500 has two limit switches for indicating alarms and are useful for triggering an external device when a target reaches a set position. Data formats are available both in ASCII and Binary with selectable termination characters. This sensor has the ability to output the sensor’s internal temperature and return signal amplitudes in its data stream.

AR2500 Case Studies

Laser Height Pole Measurement

Effectively moving oversized loads requires precautionary measures to ensure safety. This is particularly necessary when it comes to route surveys. A crucial element to maintaining precautionary measures in the route survey process is ensuring proper overhead height measurement.




Range: Working distance between measurement endpoints over which the sensor will reliably measure displacement.

Accuracy: The sum of all measurement errors when compared to a known standard.

Resolution: Smallest increment of change in distance that a sensor can detect.

Sample Rate: Speed that data samples are obtained from the sensor.

Options and Accessories

Connection Options

Acuity offers the following standard and optional outputs for the AR2500 laser rangefinder devices:

Standard RS-232 Serial Output

An RS-232 Output is standard on the AR2500. Cables purchased with the laser come with flying leads that can be wired directly to whatever connector your computer or PLC uses. The data from the AR2500 is output as ASCII and may be set to decimal or hexadecimal numbers. The maximum transfer rate is 921600 baud.

Optional RS-422 Serial Output

The AR2500 can be purchased with an RS-422 serial output for applications that require long cables (> 20 ft).  The RS-422 serial output replaces the RS-232 output, so please double check the output your application requires before ordering. The available sample rates, formats and software configuration commands are the same for a RS-422 output as it is for RS-232.

Standard Current Loop Output

4-20 mA, analog, current output is included on all AR2500 sensors. The maximum and minimum current outputs can be set to any point on the sensor’s range, even inverting direction if necessary. The 4-20 mA output has a maximum voltage capability of 10 V, and we suggest that a 400 to 500 Ω resistor be connected to the current loop wires at the measurement point for best accuracy.


Cables sold separately from unit. Please see ordering sheet, under download tab, for more details on cable lengths. The AR2500 should be ordered with a 2m (6 ft) cable that has a Binder series 713, M12 female connector. The cable has no termination on the non-connector end so the customer must perform their own wires for connection or use an Acuity Connectivity kit for ease of use. Longer cable lengths can be ordered upon request.


To improve performance within 300 meters, use a retroreflective target for the highest luminance and reliable reflection. These targets will reflect the 905nm laser light directly back to the sensor. Acuity sells portions of this reflective sheeting in 2″ X 12″ (51 mm X 310 mm) pieces.


For high-volume applications where installation of the sensor module will be inside your own enclosure, Acuity offers our AR2500M (module) for original equipment manufacturers. The module has the same performance as the standard AR2500. The sensor uses a CMOS-level serial interface. The wire connections to the board are accomplished through terminal block. The power requirements are also different.

Connectivity Kit

As an option, Acuity sells a connectivity kit to aid in connecting your laser to a power supply and serial port. This product includes a 120V, 15 VDC, AC power supply; a serial cable with DB9 connector; and a solid-state, NEMA-4X interface box. The interface box includes two sets of terminal blocks for simple input (from sensor) and output (to your selected device), a DB9 male serial connector out, and a barrel style power connector in. You can either pass through the wiring to another unterminated cable, connect a DB9 serial cable directly to the interface box, or both at the same time.

Also available: A 240 V version with a European-style plug; connectivity kit with serial to USB cable.






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