BERTHOLD TECHNOLOGIES LB 3602, Руководство по эксплуатации

Страница: 10 / 43

LB 379
10
1.4 Measuring Paths and Sources
1.4.1 Measuring Path LB 379
The measuring path LB 379 includes the following components in a compact unit:
The radioactive source (1), isotope Am-241, with an activity of 1,110 MBq (30 mCi) and
3,700 MBq (100 mCi) or in exceptional cases 11,000 MBq (300 mCi).
The measuring path is no longer type approved for a source activity of 11,100 MBq (300
mCi).
Am-241 is particularly suitable for determining the concentration of components having a
high atomic number (iron, nickel, HCl, etc.) in a carrier liquid having a low atomic number.
The energy is 60keV, the half-life 433 years.
The radiation source is installed in a stainless steel coated lead shield (2). The collimator
(3) allows the unattenuated exit of the useful radiation only in the direction of the product
pipe.
The radiation is shielded by the lead shielding (2) and by the case even if the pipeline is
empty, so that no additional protective measures are required.
In non-lined measuring paths, the product pipe DN 65/PN 10 (4) is made of stainless steel
1.4571 or 1.4401. The material number is stamped on the flange or on the pipe. Stainless
steel 1.4301 is used for lined pipes. A lining made of PTFE (Teflon) can be supplied to
protect the pipes against aggressive products. To protect the pipes from abrasive wear, we
recommend using a lining made of soft rubber. For use in the food industry, a product pipe
with threaded ends DN 65 according to DIN 11851 can be supplied instead of the flanged
pipe. No lining is possible with this design. The detector (scintillation counter) LB 4451 (5)
is located in the upper part of the measuring path. It is explosion-proof.