IZAR RADIO EXTERN AIR measures temperature and humidity and sends information via radio, using the OMS protocol. With its modern and inconspicuous design, it is especially developed for in-house application. The hybrid and flexible sending scheme ensures operating reading in mobile (walk-by) and/or fixed network (wireless or wired) mode.


  • Easy installation
  • Modern and inconspicuous design
  • Fast set-up without software
  • Suitable for mobile reading (Walk-by) and fixed network
  • Battery powered with a lifetime of up to 10 years
  • Wide temperature range for in-house application
  • Accurate data
  • Operating principle

    IZAR RADIO EXTERN AIR is an electronic unit which measures humidity and temperature. The data is sent within an adjustable sending interval to a mobile or fixed network receiver. The telegram is according to OMS specification.

    Mobile reading in walk-by:
    The data sent by IZAR RE AIR is collected using either a handheld computer or a tablet equipped with an IZAR RECEIVER BT. Data is then directly transferred to a centralized monitoring system.

    Fixed network:
    A fixed receiver IZAR RDC STANDARD, IZAR RDC BATTERY or IZAR RDC PREMIUM collects and saves the data and transmits it cyclically to a central FTP server. Data visualization can be done using IZAR@NET software or IZAR PLUS PORTAL.

  • Technical Data
    Communication protocolOMS 3.0.1; Encryption Mode 5 with AES128bit Encryption
    Frequency868.95 MHz
    Transmission power10 mW
    Transmission modeT-Mode and S-Mode
    Radio rangeUp to 600m depending on installation conditions
    Programming interfaceDIP-switches
    StandardsEN 60950 Information technology equipment
    Power supply2 x AA replaceable batteries included
    Battery lifetimeUp to 6 years (1min sending interval) / Up to 10 years (15min sending interval) *
    Sending interval1min, 5min, 10min or 15min
    AccuracyTypically ±2% in the range of 20-80%; Typically ±0.3°C in the range of -10°C up to 55°C
    * The lifetime depends significantly on the performances of the battery and is not guaranteed.
  • Ambient Conditions
    Operating temperature°C-10 ... +55
    Ambient humidity%20 ... 80 (non-condensing)
  • Dimensions

You are currently using an outdated Internet browser, which is no longer supported for technical reasons. To use the Diehl website right, please use a modern browser in the latest version, such as Edge, Chrome, Firefox or Safari.


We would like to use Google Analytics to optimise the design of our website. Through this, Google collects data which is aggregated and made available to us as a statistical overview. By clicking "Agree", you consent to tracking by Google Analytics. This consent is voluntary and can be revoked at any time. If you click "Decline", no tracking will take place. For more information, please see our privacy policy.