IF-540 Passive Infrared Detector


This passive infrared detector produces a signal when it senses a rapid change in incident infrared radiation within its field of view. Users can deploy passive infrared detectors to detect vehicles, people, and objects. The IF-540 is a larger, more sophisticated model than the IF-520 and features a better nominal detection range of up to 350 feet (107 meters) for personnel. The IF-540 is best for long-range monitoring in airports, isolated roads and trails, or any application where monitoring devices are difficult to conceal or place close to the target area.

Telonics can sell this product only to law enforcement, military, and government agencies; these products are for use only within such agencies.

Key Features

  • Users can use the IF-540 to determine direction of travel
  • Operates under harsh environmental conditions
  • High immunity to false alarm sources



Size L x Dia13 x 4.0 in
330 x 102 mm
Weight44.0 oz
1230 g


Minimum operating temperature-40° C
Maximum operating temperature60° C
Detection typePassive infrared
Personnel detection, expected range350 feet
Vehicle detection, expected range500 feet

Service Commitment

Since 1970, Telonics has built a reputation based on product quality, product support, service, and customer satisfaction. Telonics strives to produce the highest quality products, and to support those products accordingly.

Because of extreme conditions and the unpredictable nature associated with most telemetry applications, problems occasionally arise. Most problems can be resolved quickly. In all cases, we hope to be able to work in partnership with users to resolve problems to the user's satisfaction and to uphold our demonstrated commitment to excellence. If problems should arise, all products must be returned to our factory for failure analysis.


Telonics warrants its products to be free from defects in material and workmanship for a period of one year from the date acquired. Telonics does not warrant batteries.

If a defect occurs, return the equipment to us within the proper time frame at the following address: TELONICS, 932 E. IMPALA AVENUE, MESA AZ USA 85204-6699. Damage to any equipment resulting from misuse, accidents, unauthorized service, extreme conditions, or other causes, is excluded from this warranty. Telonics does not assume responsibility for loss or damage to equipment during shipment. Telonics does not assume responsibility for delays resulting from shipment on commercial or private carriers. We insure all equipment shipped from our facility and suggest that shipments to Telonics also be insured.

Upon the timely return to our facility, if defective, the product will be replaced or repaired at our discretion at no cost to the customer. This remedy is the exclusive remedy. This product is supplied without any further warranties or conditions, expressed or implied, including warranties of merchantability, quality or fitness for particular reason or those arising by laws, statutes or trade usage or course of dealing.

The entire risk, as to the results and performance of the product, is assumed by the customer. Neither Telonics, nor its suppliers, shall have any liability to the customer or any other person or entity for any indirect, incidental, special, or consequential damage whatsoever, regardless whether Telonics has been told of the possibility of such damages or that such damages might be foreseeable. Telonics has no responsibility or liability for the claims of any third party. The maximum aggregate to the customer, of Telonics and its suppliers, shall not exceed the amount paid by the customer for the product.