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RTM 1688-2
Depending on the setup setting, either only the decays of the thoron decay product Po-216 or
additionally those of the radon decay product Po-218 are signaled.
However, due to the relatively long half-life of about three minutes, the Po-218 is only suitable
for "sniffing" to a limited extent.
The procedure for the "sniffing" measurement would be as follows:
You should configure the device using the supplied software (Radonvision).
The interval can be set anywhere between 1 and 255 minutes via the software (only fixed
values can be selected on the device). An interval of 5 min can be selected for radon and 1
min for thoron. The configuration of the alarm can be determined. The pump mode should be
set to continuous. The measurement should be made for radon in the "fast" (FAST) mode
(display shows radon*).
The charging status of the battery should be checked (if possible >12V).
It should be noted that the pump only runs when the water ingress protection is plugged in
(or just the plug).
A sealing compound should be applied around the hose at the measuring point to prevent the
surrounding air from being sucked in.
The measurement can be started by pressing the toggle button.
If the measured values are below the limit to be detected, BDL (Below Detection Limit)
appears on the display.
Data Handling
Data Storage
All data are stored in a non-volatile memory using a circular architecture. That means, the last
2047 data records (data of last 2047 integration intervals) remain in the memory. Older data
will be overwritten if the memory exceeds the limit. Because the complete measurement data
are transferred during download to the PC, the memory should cleared after successful data
transmission and storage on hard disk. This will save time during the next transmission and
avoids redundant data storage.
Each data record is stored after completion of the integration interval and contains the full
information of this single integration interval:
•
time stamp
•
integration time
•
alpha spectrum
•
readings of additional sensors
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Manual_RTM1688-2_EN_24-02-2023.docx
SARAD GmbH 2023
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