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10 EXTERNAL ACCESSORIES
At this place the external accessories of the AlphaGUARD can only be described
as far as the correct connection to the AlphaGUARD
is concerned. Details relating
to the parameters of the performance of these components are available in the
corresponding technical description.
Tyvek® dust protection bag
When using AlphaGUARD in dusty environments (e.g. mines), it is recommendable
to protect the AlphaGUARD against dust with a Tyvek® bag. The Tyvek® dust
protection bag consists of paper fleece like functional textile made from high
density polyethylene fibres. The diffusion activity of the radon into the detector is
only marginally delayed by the bag’s tissue.
External battery
To extend the battery life time of AlphaGUARD an external battery unit can be
connected to the mains power connector. Please check with us for individual
and proposals.
Radon progeny front end AlphaPM
The radon progeny measuring front end of the type AlphPM is a professional radon
progeny meter for the time-resolved recording of air-borne radon progeny
concentration. An integrated pumping
element continually sucks the air through
a filter, collecting radon progeny products which are attached to aerosol
particles. Based on a 10 min, cycle, the alpha activity of the accumulated
progeny products is measured by an alpha sensitive microchip opposite to the
filter platelet, evaluated and transferred as a sequence of TTL
-signals to its signal
output (Interface for external sensors 1) where it is tapped by the AlphaGUARD.
To the range of delivery of the AlphaPM belongs a shielded special cable. This
cable is provided with a plug for the Interface for external sensors 1 and serves for
transmitting the signals between AlphaPM and AlphaGUARD.
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