... 95%RH max. (+5~20°C)3. Using life:RL7 series:Electrical life (resistive load): 200,000 operations min.(on/off frequency ... packing machines, machine tool, conveying machinery, auto production line control, ideal for light industry machinery which need the strict ... and so on.RL8 series:Ideal for general plant facilities: engineering machinery,conveyer machinery, assembly line, injection molding machine, ...