The TERA system is designed for:

- simultaneous surveillance of radon concentration  in several rooms in a building, and/or automatic control of different types of active radon mitigation systems against radon (for example: radon suction (Radonsug) or ventilation systems).

The TERA system consists of at least 2 components: 1 TERA Radondetector and 1 TERA Terminal. The system is modular and can be upgraded with a variety of components as described below.

In response to a situation where the registered radon concentration exceeds a predetermined level (the alarm level) for example 100 Bq/m3, in a room where the TERA detector is located, the system is able to respond by activating a fan or increasing the effect in a ventilation system.


The function of the TERA system involves the following components:


The TERA Radon detector: Continuously monitors radon levels and sends data to the TERA Terminal using radio waves. This recently developed diffusion-based radon detector impresses and surprises with capabilities that is normally only found in the most expensive radon detectors, which makes the TERA radon detector the best deal in the market:

Its sensitivity of 0.15 counts/h/B/m3 (typical) is many times higher than for example Canary, Canary Pro - and higher than RadonScout. Excellent sensitivity makes the instrument respond quickly, which is particularly important when measuring drastic changes in radon concentration often seen with ventilation systems. Short diffusion times ensure good responses also to Thoron gas (Rn-220).

Automatic correction due to relative humidity. This capability will ensure correct values within a broad range of relative humidity: 10-90% RH. The correction is calculated by the instrument itself, not the software. Such corrections are normally only carried out by more expensive instruments.



The TERA radon detector gives the user flexibility by allowing the selection of read-out intervals from 4 min. up to 18.2 hours, which can be important during complex surveys and tests. Default read-out interval is 60 min.

 Memory capacity of 150 days using 1-hour sample intervals. In addition to presenting the radon concentration in Bq/m3, the instrument also registers relative humidity (10-90%) and temperature (-20 to +60 degrees C). Atmospheric pressure (150-1150 hPa) is registered in the TERA Terminal unit.

Automatic wireless (radio) transfer of registered data from the TERA radon detector to the TERA Terminal. Measurements can subsequently be downloaded from the TERA terminal to a PC via USB. This “double” saving feature provides a safety measure against technical and human errors that may occur.





TERA Radonmåler

The TERA radon detector can operate (collect data) alone or in a network of up to 16 units. This makes the TERA radon detector a very good tool for parallel measurements in many rooms in a building (e.g. level 2 measurements at workplaces with mechanical ventilation).

 One AA size lithium battery normally lasts for one year.

 State-of-art software TERAview is used for programming one single TERA radon detector, or a whole network of up to 16 TERA radon detectors, and the reading of measurements. A separate module in the software shows graphs from each instrument and calculates the average radon concentration within defined periods of the day (e.g. during working hours)

 Robustness and reliability. The TERA radon detector is tested under very different conditions and physical stress over a long period and has proven to be extremely robust and reliable. The instrument is therefore extremely suitable for radon measurement in homes, workplaces, mines, tunnels, mountain facilities, in soil, etc.

The TERA radon detector can be set-up to act as a radon monitor in a TERA system. The TERA system can control various mitigation solutions such as radonsug or ventilation systems. This is achieved using the system's components: the TERA Actuator and the TERA Relay. The system can, based on measured radon levels, activate a fan or increase the speed of a ventilation system, if the radon levels in rooms where the TERA radon detector is located, exceed a certain preset radon level (alarm level), for example 100 Bq/m3.


TERA Terminal The TERA Terminal: Receives radon concentration measurement data from any room where TERA radon detectors are located and compares the radon level in any room with a preset alarm level (e.g. 100 Bq/m3). If the radon concentration in some room exceeds the alarm level, a signal is sent to the TERA Actuator which through the TERA Relay activates a fan (for example Radonsug), or changes the speed of a fan (e.g. ventilation). When radon levels reaches below the alarm level, the TERA terminal will send a signal to switch off or reduce the speed of the fan.


TERA Repeater

TERA Repeater: This component increases the range of signal transmission between components of the TERA system. If the distance between the TERA Terminal and some of the TERA radon monitors is too large, or if walls weakens the radio signals too much, a TERA Repeater will amplify the radio signal and ensure that measured data is transmitted without interruptions.




TERA Actuator

TERA Actuator: This unit receives signals from the TERA Terminal and forwards the signal to the TERA Relay. This component receives a signal from the TERA terminal and can be used to:

- directly control a smaller fan (up to 30W) or
- send the signal over to the TERA Relay that can control fans up to 1500 VA (AC)



TERA Relay: This component will receive a signal from the TERA Actuator and switch on or off electric fans with up to 1500 VA (AC).

TERAview: State-of-art software used for programming of the entire network of the above components, setting the alarm level, and for reading the measured data from all TERA radon detectors defined by the network.

Manuals and software downloads

1. Quick Start Guide in norwegian

2. User manual in english

3. Drivers

4. Software setup and reading data