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  • New item   Dosimeter-radiometer with temperature sensor | 0…65000 μR/h | −40…+70 °C | 1-Wire | for D105 pulse analyzer | smart-MAIC | DR-20
    New item   Dosimeter-radiometer with temperature sensor | 0…65000 μR/h | −40…+70 °C | 1-Wire | for D105 pulse analyzer | smart-MAIC | DR-20 1

    Dosimeter-radiometer with temperature sensor | 0…65000 μR/h | −40…+70 °C | 1-Wire | for D105 pulse analyzer | smart-MAIC | DR-20

    Code: DR-20
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    Dosimeter-radiometer for remote real-time monitoring of gamma background level, accumulated dose and ambient temperature. Connects to the D105 1-Wire input (not RS485) and is powered with 5 V from the D105. Range 0…65000 μR/h, data refreshed every 10 s.

  • Product description

    Dosimeter-radiometer with temperature sensor | 0…65000 μR/h | −40…+70 °C | 1-Wire | for D105 pulse analyzer | smart-MAIC | DR-20

    The DR-20 is a dosimeter-radiometer with a built-in temperature sensor, designed for continuous radiation background monitoring via the smart-MAIC D105 pulse analyzer. According to the manufacturer, it measures gamma background level, accumulated dose and ambient temperature in real time.

    Key point:
    A handheld dosimeter shows the situation only at the moment you measure. The DR-20 measures continuously, and the D105 sends the data, refreshed every 10 s, to the cloud – creating a continuous background history and allowing a notification when the level rises. It connects to the 1-Wire input and is powered from the D105, so no additional power supply is needed.
    Range
    0…65000 μR/h
    Temperature
    −40…+70 °C
    Refresh
    every 10 s
    Interface to D105
    1-Wire (not RS485)

    Connection to D105 and integration

    • 1-Wire input (terminal 4) – The yellow wire (1-Wire) connects to D105 terminal 4. The DR-20 occupies the entire 1-Wire input – it cannot be combined with DS18b20, DHT22 or D280.
    • Power (terminals 6 and 1) – Red wire – terminal 6 (+5 V DC from the D105), white – terminal 1 (GND). The green wire (TX UART) is not used with the D105 – it is intended for third-party devices (UART 9600 baud, 5 V).
    • Configuration and data – In the D105 “Counter config” settings select the radiation sensor, wait 15 s and press “Refresh” in the “Current Data” window. T1 – temperature, T2 – μR/h, T3 – pulses per minute.

    How it works

    The device is fixed at the monitored location – indoors, under a canopy or in an outdoor enclosure – and connected to the D105 with three wires (5 V, GND, 1-Wire). The green UART wire is insulated.

    The DR-20 registers ionising radiation particles, counts them per minute, converts the count into exposure dose rate (μR/h) and measures temperature at the same time. Data is refreshed every 10 s.

    In the smart-MAIC cloud you see radiation background and temperature curves and history, and can set a notification or D105 relay action when the background exceeds your threshold. Data is also available via API and MQTT.

    Why choose the DR-20?
    It turns the D105 into a permanent radiation background monitoring station: no separate power supply, with cloud history and notifications. It is a simple way to have your own objective background data instead of occasional measurements.

    Technical specifications

    Product type Dosimeter-radiometer with temperature sensor
    Manufacturer / model smart-MAIC / DR-20
    Radiation background range 0…65000 μR/h
    Temperature range −40…+70 °C
    Data refresh every 10 s
    Output signal D105 1-Wire / TX UART (9600 baud, 5 V)
    Power supply 5 V DC (from D105 terminal 6)
    Operating temperature −40…+70 °C
    Operating humidity 0…95 % RH
    Dimensions (L × H × W) 125 × 20 × 85 mm
    Weight 120 g
    Connection to D105 1-Wire input, terminal 4; GND – 1, +5 V – 6; green TX wire not used
    Data channels T1 – °C, T2 – μR/h, T3 – pulses/min

    Key functions

    • Continuous gamma background measurement – a continuous history, not occasional readings.
    • Wide range 0…65000 μR/h – from natural background to high levels.
    • Temperature in the same device – an extra parameter without a separate sensor.
    • Refresh every 10 s – fast response to changes.
    • Notifications and relay – an alert or equipment switching when the threshold is exceeded.
    • UART output – can be connected to third-party controllers without a D105.

    How does it differ from similar products?

    • DS18b20 – Measures temperature only, but with ±0.5 °C accuracy and up to 5 pcs on one input; in the DR-20 temperature is an extra parameter alongside radiation.
    • D280 – Also connects to the 1-Wire input and measures temperature, humidity and pressure; it does not measure radiation. One D105 takes either the D280 or the DR-20.
    • D105 Solar – Measures solar irradiance (W/m²) via RS485 – this is light energy, not ionising radiation.

    Where is it used?

    • Municipal and community environmental monitoring
    • Civil protection and emergency preparedness facilities
    • School and university physics laboratories
    • Scrap metal yards (indicative background monitoring)
    • Private houses and country homes
    • Weather stations together with other D105 sensors

    Use by need

    For municipalities and communities.
    Continuous, publicly available background data – objective information for residents without manual measurements.
    For physics teachers.
    Real radiation background measurements in the cloud – material for lessons on natural background and its variation.
    For civil protection specialists.
    A notification if the background suddenly rises – a faster decision on whether further checks are needed.

    Practical use

    If you want continuous radiation background data at your site, mount the DR-20 in an outdoor enclosure and connect it to the D105 1-Wire input. Then set a notification in the cloud, for example when the background exceeds 50 μR/h, and you will be alerted if the level rises unexpectedly.

    Pros

    • Continuous gamma background monitoring with history
    • Wide range 0…65000 μR/h
    • Temperature in the same device
    • 5 V power from the D105, no extra unit
    • Refresh every 10 s
    • Additional UART output for other devices

    Cons / limitations

    • Occupies the entire D105 1-Wire input – cannot be combined with DS18b20, DHT22 or D280.
    • The manufacturer does not state measurement error – this is a monitoring device, not a metrological instrument.
    • Designed for gamma background; radon concentration requires a dedicated radon monitor.
    • Not compatible with RS485 – connects only via 1-Wire or UART.

    Safety and installation notes

    • Connect the sensor only with the D105 power switched off.
    • Insulate the green TX UART wire – it is not used with the D105.
    • Follow the wire colours: red – terminal 6, white – 1, yellow – 4.
    • Outdoors, mount in a protective enclosure – operating humidity up to 95 % RH, no direct water.
    • Do not move the device often – the history is comparable only at the same location.

    Quick selection guide

    0…65000 μR/h
    −40…+70 °C
    1-Wire, every 10 s
    5 V from the D105
    Suitable when you need:
    • continuous radiation background monitoring
    • a notification when the background rises
    • background and temperature history in the cloud
    Check before use:
    • that the D105 1-Wire input is free
    • that the mounting point is protected from direct water
    • that you do not need a metrologically approved instrument
    Important reminder: The DR-20 works with the D105 via 1-Wire (not RS485) and is not intended for occupational exposure records – where regulations require personal dosimetry, use certified instruments.

    FAQ

    Which D105 input does the DR-20 connect to?
    To the 1-Wire input (terminal 4), not to RS485.
    What is the green TX UART wire for?
    For third-party devices (UART 9600 baud, 5 V); it is not used with the D105.
    Is a separate power supply needed?
    No, the DR-20 is powered with 5 V DC from D105 terminal 6.
    How to convert μR/h to μSv/h?
    Approximately 100 μR/h ≈ 1 μSv/h.
    Can a DS18b20 be connected at the same time?
    No, the DR-20 occupies the entire 1-Wire input.
    How often is data refreshed?
    Every 10 s, and it is sent to the cloud according to the D105 data interval.

    DR-20 dosimeter-radiometer for the smart-MAIC D105 analyzer

    The DR-20 continuously measures gamma background 0…65000 μR/h and temperature −40…+70 °C, connects to the D105 1-Wire input and is powered with 5 V. Background history and notifications in the smart-MAIC cloud.

    Illustrative image may have been created using AI. The appearance of the product may differ slightly from the image shown. Please refer to the technical specification.

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