| 摘要 |
A device 202 for detecting corrosion in a central heating system having a conduit 204 formed from a non-magnetic material comprises a magnet 208 and a holder 206. The magnet 208 is held against or adjacent the outer surface 210 of the conduit by the holder 206 and attracts ferromagnetic particles 212 dispersed inside the conduit 204. The holder may be held on to the conduit for a test period and then removed by sliding or rotating to release the magnet so that movement of the magnet under gravity provides an indication of no or undetectable corrosion in the system. The test period may be up to half an hour or up to week. The magnet may comprise an alloy of iron, nickel or cobalt and may have a magnetic moment of over 10000 Gauss and a weight of up to 20 grams. The holder may comprise a housing to enclose the magnet and a retaining member to hold the magnet against the conduit. |
