6150AD5/Ex and Probe 6150AD-18/Ex
The Dose Rate Measuring Device 6150AD5/Ex is specially designed for use in potentially explosive areas, hereinafter referred to as “Ex area”. A hazardous area is an area in which there is a risk of fire or explosion because flammable substances (gases, vapours, combustible dust) may be present.
The measured quantity is the ambient equivalent dose H*(10). A built-in Geiger-Müller counter serves as a detector, which allows measurements of dose rates up to 1 Sv/h. Below 0.2 mSv/h, the dose rate display fluctuates more than 5% around its mean, which makes the reading more difficult. Therefore, for measurements at low dose rates, the Probe 6150AD-18/Ex is available as an optional accessory, which is connected to the 6150AD5/Ex via the Probe Cable 878.1.1 (length 1.25 m, customer-specific up to 10 m possible). The 6150AD-18/Ex probe has a larger counter, which then allows measurements up to “only” 10 mSv/h yet is more suitable for low dose rates due to its significantly higher sensitivity.
According to the EC type examination certificate no. “PTB 04 ATEX 2004”, the Physikalisch-Technische Bundesanstalt (PTB), the 6150AD5/Ex and Probe 6150AD-18/Ex meet the basic requirements for the intended use in Ex areas (Zone 1). We did not strive for a type examination certificate in accordance with the German Measuring and Verification Act, the earlier “Approval for Calibration” because of the relatively small number of items.
The function of the 6150AD5/Ex corresponds to that of the normal 6150AD5/E. It is painted blue for better external differentiation. There are also some differences that result from the Ex regulations: