IP rating is a standardised way to describe how well a device is protected against solid particles and liquids. IP67 means the device is completely dust-tight (first digit: 6) and can survive being submerged in water to 1 metre for 30 minutes (second digit: 7).
The two digits each have a specific scale:
- First digit (dust): 0 = no protection, 4 = objects over 1mm, 5 = dust-protected, 6 = fully dust-tight
- Second digit (water): 0 = no protection, 4 = splash from any direction, 5 = water jets, 7 = 1m immersion, 8 = continuous submersion
- IP30 – typical for DIN-rail mounted panel equipment: solid objects over 2.5mm, no liquid protection
- IP54 – dust-protected, splash-resistant: standard for vehicle-mounted trackers
- IP67 – fully dust-tight, 1m immersion: standard for outdoor sensors and ruggedised field trackers