Is a combined checkweighing and metal detection system double trouble or half the hassle?

Combining a metal detector and checkweigher in one system isn't a new idea - equipment designers have been making so-called ‘combi' units for years. Could it be, though, that the economic climate is prompting  food manufacturers and packers to opt for combi units instead of separates in a bid to reduce costs?

When Loma Systems launched its CW3 combined checkweigher and metal detector at last year's PPMA show, it reported that many of its customers had expressed interest in the combi unit due to the significant savings that can be made when purchasing a combined machine as opposed to separate units.

PCL Machinery, which refurbishes inspection equipment and has its own budget range, agrees that combi units are becoming more popular, but puts this down to the space - rather than the cost - savings they afford.

Selo UK sales manager Chris Keenan agrees: "On most production lines space is at a premium."

So it seems space rather than cost tends to be the primary reason for choosing a combi system. Even so, there is still a cost advantage to buying a combined unit. Weighing equipment supplier Sartorius says its combi units are on average 30% cheaper than installing a separate metal detector and checkweigher.

In addition, Ishida Europe says combis offer better performance, as the metal detector is fixed to the checkweigher and cannot be moved out of position. Slightly higher speeds are also possible as a single frame unit is more stable and compact.