General Instructions Observe the basic safety instructions when using the LVS. The pressure device regulation 97/23/EC must be observed if devices with an overpressure of 0.5 bar or more are connected. The pressures at the suction and pressure sides of the diaphragm pump at the time it is switched on must correspond to the specifications of DIN 28432. In order to avoid pumping speed losses, all the vacuum connecting hoses used should have a large nominal diameter and should be laid out so that the lengths are as short as possible. Avoid rigid connections. They must be assembled carefully in order to achieve a low leak rate. We recommend fitting non-return valves (order no. 720327) for applications with several consumers.