IP67, IP68, IP69K: what sensor ingress ratings mean
, 3 min read
An IP code has two digits: the first rates protection against solids (6 means dust-tight), the second against water. IP67 survives temporary immersion to 1 m for 30 minutes; IP68 survives continuous immersion under conditions the manufacturer states; IP69K survives high-pressure, high-temperature wash-down.
The water digit
| Code | Test |
|---|---|
| IPx4 | Splashing water from any direction |
| IPx5 | Water jets from a 6.3 mm nozzle |
| IPx6 | Powerful jets from a 12.5 mm nozzle |
| IPx7 | Immersion to 1 m for 30 minutes |
| IPx8 | Continuous immersion beyond 1 m, conditions set by the manufacturer |
| IPx9K | High-pressure, high-temperature spray |
Choosing a rating
- Indoor dry installations: IP54 is usually enough
- Outdoors, rain and dust: IP65 to IP67
- Tanks with condensation and wells that may flood: IP67 or IP68
- Permanently underwater: IP68 with a stated depth
- Food and vehicle wash-down: IP69K
Read the conditions
IP68 has no fixed depth in the standard. Check the depth and duration in the datasheet, and remember that the cable gland and connector must carry the same rating as the housing.