The RTM 1688-2 is a versatile radon and thoron monitor covering the complete field of radon measuring. Its high sensitivity combined with its spectroscopic measuring method allow for fastest measuring even of low concentrations of radon. At the same time the concentration of thoron can be quantified.

Radon entry paths can be discovered by the “sniffing mode”. Soil gas sampling as well as radon in water measurements are simple because of the built in pump.

The operation of the radon/thoron monitor is realised by only one button. A serial printer may be connected to the interface of the RTM 1688-2 to present a protocol directly on site.

The radon/thoron monitor can be directly connected to a modem for remote data transmission. The Radon Vision software (included in delivery) handles the remote connection as simply as a direct cable link.

The measurement chamber is not sensitive against humidity variations; a drying tube, commonly used in such instrument types, is not required.

Special attention was paid for the issue of quality assurance. Each stored data record contains a complete alpha spectrum which shows the error-free operation of the instrument for each single integration interval. Any number of measurement series may be created by starting/stopping the data acquisition. The data stored within the instrument can be read by PC even if a measurement is in progress.

The small chamber volume of only 250 ml must be pointed out. The measurement of probes taken from small and limited volumes is possible due to this property.

The radon/thoron monitor RTM 1688-2 can be powered either by a mains power adapter or by the internal battery which gives an autonomous operation time up to 14 days.

The instrument is equipped with sensors for temperature, humidity and barometric pressure. An integrated tilt detector will give a signal if the radon/thoron monitor has been removed from its original position during the measurement.

The instrument comes with a DAkkS compliant calibration certificate. Our radon calibration process fulfills the requirements of the DIN ISO/IEC EN 17025:2018.

Applications:
• for measurements of the activity concentrations of airborne radon (222 Rn) and thoron (220 Rn) in homes, workplaces, in the ground, etc.
• to determine the radon content in water samples and running water
• soil air measurements in construction projects and geophysical research
• localization of radon entry paths (sniffing) in buildings
• exhalation and emanation measurements
• as autonomous measuring stations for monitoring buildings or systems
• numerous applications in geology, mineralogy, physics, chemistry, mining and civil engineeringFeatures:
• absolutely universal radon/thoron monitor for the entire measurement range
• high sensitivity and simultaneous determination of the thoron concentration
• alpha spectroscopy measurement method, for low radon concentrations and fastest possible measurements
• soil gas and water measurements with built-in pump
• water ingress protection (optional)
• user-friendly one button operation
• remote data transmission possible
• fluctuations in humidity do not affect the readings (no desiccant needed!)
• storage of the complete alpha spectrum for each measuring point
• measurement of samples from small volumes (chamber volume 250 ml)
• DAkkS-accredited calibration according to DIN EN ISO/IEC 17025:2018