Wireless Freezer & Refrigerator Temperature Sensor System – Leap Sensors

The Leap wireless refrigerator and freezer temperature sensor continuously monitors the internal temperature of your refrigerator or freezer. Set alerts via phone, text, or email to know about issues even if you’re not on-site. Streamline auditing processes. Ideal for temperature-critical applications such as laboratories, medical facilities, vaccine storage, medicine storage.

This refrigerator/freezer monitoring system is designed with key features that are only available in the Leap product line:

  • Single sensor and dual sensor (2 temperature and 2 door-open sensors) available.
  • Paper-thin cable maintains gasket seal integrity.
  • Easily replaceable NIST-traceable tip for simple calibration.
  • Industrial door-open sensor helps troubleshoot temperature alerts, as well as tracking each time the door is opened.  Sensor device node takes a reading and transmits every time the door is opened and closed.
  • Time that door is left open is reported – and alarms can be set on excessive door-open time.
  • Optional wall transformer powers the sensor and also alerts power outages. On-board battery backup assures sensor node operation during power outages.
  • Fast, simple installation with cold-proof foil stickers and adhesive-backed hook-and-loop.
  • Thermal mass bottle prevents false alarms from defrost cycles or when the door is opened.
  • Know for sure the sensor is connected & working with LED indicator light.

Contact us to find the best combination of features for your facility.

Part of the breakthrough Leap Sensors® system.


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Leap Sensors are specially designed to easily adapt to your specific needs. If this isn’t exactly what you need, please contact us.

Wireless Refrigerator & Freezer Temperature Sensor Specifications

  • Temperature Probe Range: -40F to 185F (-40C to 85C)
  • Temperature Accuracy (typical): +/- 0.2C from -40C to 70C (-40F to 160F). Sensors are tested at typical freezer and refrigerator temperatures.
    • Accuracy of +/- 0.1C available on request.
  • Single sensor and dual sensor (2 temperature and 2 door-open sensors) available.

Special High-Value Features and Options

  • Thermal mass bottle (see photo) prevents false alarms when the door is opened or during defrost cycles.
  • Paper-thin cable goes through door gasket to maintain seal integrity.
  • Installation is fast and easy with the hook and loop and foil stickers. Special adhesive sticks cold surfaces.
  • Streamline calibration with replaceable calibrated tip. Simply switch out the tip every year.
  • Industrial door-open sensor transmits every time door is opened, streamlining tracking as well as helping to troubleshoot temperature alerts. Simple installation assures long-term reliable operation.
    • Door-open sensor tracks the amount of time that the door is left open. Alerts can be set on excessive door-open time.
  • Optional AC power and power outage detection system available. The sensors are powered by a wall transformer and the battery acts as a back-up. Designed with a sensor transceiver node to track and alert power outages.

refrigerator wireless sensor

Leap Wireless Sensor Transceiver Node Specifications

  • Transmission distance to gateway: typically 1500 feet in open air. Several hundred feet in an industrial environment.
  • Battery
    • Two standard AA alkaline batteries.
    • Typical life of 3 years.
  • LED integrated into the power switch blinks to provide user feedback on sensor functions.
  • Rugged sensor enclosure
    • IP68 enclosure rated to 120C (248F). Panel connectors and glands rated to IP68. Power switch with LEDs rated to IP66.
    • Rugged polycarbonate composite enclosure. UL 94 V0 rated, flame-resistant and self-extinguishing.
    • 3.5 x 3.2 x 1.85 in (89 x 80 x 47 mm), not including optional mounting feet.
  • Long-range antenna inside the enclosure: Keeps the total footprint small and prevents damage to the antenna.
  • Mounting options
    • See all enclosure mounting options.
    • Optional mounting feet may be installed horizontally or vertically.
    • Enclosure may also be mounted with screws directly to surface.
    • Magnetic mount option.
    • Hook and loop with special adhesive.
  • Cable connection options
    • Standard: Metal IP68 cable glands seal cables to the enclosure. Industrial spring terminal blocks connect the cable to sensor board.
    • Optional: M8 panel connector and cable: Molded M8 cable connects M8 panel connector to sensor.
      • Cable length may be shortened in the field if desired.
    • More information here.
  • Industrial power switch: Latching push button. IP66 rated.
  • Operating temperature: Standard sensor -40C to 55C (-40F to 130F).
  • 2-way communication with the sensor through the user interface:
    • Name the sensor (device), set sensor sampling time interval, set wireless transmit time interval, over-the-air firmware updates.
    • Gateways send an acknowledgement to the device that the data was received for high reliability.
  • Sensor data logging: When sensors do not receive an acknowledgement from the gateway that the radio transmission was received, the sensor will store the time-stamped data on-board (up to 10,000 readings) until the gateway connection is established.
  • Reliable industrial over-the-air radio communication
    • Industry-standard 802.15.4 with Direct Sequence Spread Spectrum (DSSS).
    • Gateway “handshake” acknowledgement of successful transmission and sensor data logging for extra reliability.
  • Over-the-air protocol: Standard and established 6LoPan and Thread.
  • Data security: “gold standard” internet security with AES encryption.
  • FCC certified.

Leap Wireless Sensors Gateway (Receiver) and User Interface Software

  • See the Leap Sensors gateway page and the Leap Sensors User Interface options page for more detailed information.
  • Leap Sensors wirelessly transmit data to a gateway*.
    • Gateway can support over 250 sensors that are in range. (Additional gateways can extend sensor coverage.)
    • The gateway then passes the data to the Leap user interface software. The user interface software may be hosted on the gateway (and connected to a PC with a USB cable), on the password-protected Leap Sensors Cloud website, or an on-site server.
  • User interface supports: logging-in, set user rights, view sensor data, set email and text alerts (cloud version), graph sensor data, download data to excel, add or subtract sensors, update firmware, and other functions.

*Custom-ordered leap sensors are available with a direct-to-cellular option where no gateway is needed and the data is sent directly to a cloud server. Contact us for more information.

About Leap Sensors®

Better Design – Better Data – Better Decisions™

Based on Phase IV Engineering’s 25 years of wireless sensor experience, Leap is THE system designed from the ground up to meet the specific needs of industrial users. These sensors are a true leap advancement in Industrial IoT wireless sensing.

  • Modular design makes it easy & cost-effective to adapt to your specific needs – and update easily for a “future-proof” system.
  • Edge computing manages large amounts of data before transmission to software – only get information you need.
  • Bank standard data security: Multi-layered Thread network security using AES-128 data encryption.
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This wireless sensor is ideal for monitoring:

  • Food refrigerators
  • Food freezers
  • Medical refrigerators
  • Medical freezers

Patents pending.

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