Professional Selection Guides & Technical Insights
Short answer: IP ratings are test results, not a ladder. IP65 is dust-tight plus water jets, IP67 adds 1m immersion, IP69K is dust-tight plus 80 to 100 bar washdown at 80°C. Specify IP65 for sheltered duty, IP67 for rain or immersion, IP69K only for pressure washdown — and remember IP covers solids and water, not corrosion, impact, UV or heat.
Most mis-specified sensors are not bought wrong because the buyer ignored IP. They are bought wrong because the buyer assumed IP covered more than it does. The IP code is defined by IEC 60529, and it describes exactly one thing: the degree of protection provided by an enclosure against solid foreign objects and water ingress, under defined test conditions.
That boundary matters. An IP rating does not address:
Keep this in mind for everything below: the rating tells you how the enclosure resists ingress in a test. Your application decides whether that test resembles your service.
The IP code carries two independent numbers. The first covers solids, the second covers water.
The scale runs 0 to 6. The digit 6 is dust-tight: no ingress of dust whatsoever under test. This is the number most buyers mean when they say "sealed." A first digit of 5 permits some dust ingress, but not enough to interfere with satisfactory operation or safety — which is not the same promise at all.
The scale runs 0 to 9, and each digit is a different test, not a higher rung on the same ladder:
That last distinction is the one procurement teams get wrong most often: IPX7 and IPX8 are not "one step higher than IPX6". Immersion and jet spray are physically different tests, and a product certified for immersion has not necessarily been jet-tested.
IP69K is not simply a bigger number than IP67. It comes from a different standards lineage — ISO 20653 / DIN 40050-9, adopted into the IEC system — and it tests a different regime.
The IP69K liquid test sprays water at 80 to 100 bar and 80 °C from a nozzle held 10 to 15 cm from each surface, for 30 seconds per surface, with the nozzle presented at 0°, 30°, 60° and 90° while the part rotates. The first digit is 6, so the device must also pass the full dust test as part of the same rating.
Read that test condition as the actual application statement: this rating exists for hot, high-pressure, close-range washdown. Food processing, pharmaceutical and cosmetics plants running sanitation crews with pressure washers are the canonical case. If your cleaning regime is a hose, IP69K is buying you capability you will never use — and paying for it in the price and in lead time.
US specs often say NEMA rather than IP, and the two systems are not interchangeable label-for-label. NEMA 4X covers corrosion resistance in addition to dust and hose-directed water, which the IP code does not address. NEMA 6 and 6P address immersion, roughly in the region of IP67 and IP68, but the test depths and durations differ, so the equivalence is approximate rather than exact.
Practically: if a datasheet claims both, treat the NEMA type as the one that carries the corrosion requirement, and check whether the IP figure was separately tested or merely inherited.
| Rating | What is actually tested | Specify it when | Do not use it when |
|---|---|---|---|
| IP65 | Dust-tight; low-pressure water jets from any direction | Indoor plant rooms, machine enclosures, sheltered outdoor positions, dust but no direct water | The device is hosed down, or it sits in a washdown zone |
| IP66 | Dust-tight; powerful water jets | Same as IP65 but where jet pressure is higher — vehicle wash bays, plant rooms with pressure washing | Any expectation of immersion; IP66 is not a substitute for IP67 |
| IP67 | Dust-tight; temporary immersion to 1 m for a defined period | Outdoor rain and splash, marine-adjacent positions, temporary submersion, washdown cabinets | You need resistance to sustained hot high-pressure jets |
| IP68 | Dust-tight; continuous immersion, conditions agreed with the manufacturer | Submersible or long-term wet installations | You have not obtained the stated immersion depth and duration — the label alone proves nothing |
| IP69K | Dust-tight plus 80 to 100 bar at 80 °C, 10 to 15 cm nozzle distance | Food, beverage, pharmaceutical and cosmetics washdown with hot high-pressure cleaning | Ordinary outdoor or general industrial service — it is not a general-purpose upgrade |
Ratings and test conditions follow IEC 60529 and the ISO 20653 / DIN 40050-9 lineage that IP69K derives from. Specific products must be confirmed against the current manufacturer datasheet before you write a rating into a specification.
Six lines turn an ambiguous inquiry into a defensible order. Add them to the request and you will get comparable quotes instead of vague assertions:
One more line worth adding: ask whether the rating appears on the housing, the connector, or the assembly as supplied and tested. That single question exposes a lot of optimistic datasheets.
Ruilianxin supplies photoelectric, proximity, vibration, pressure and measurement instrumentation from brands whose datasheets state test conditions rather than just a number. Send the six lines above and we will propose part numbers with the ingress evidence attached, instead of an unqualified "IP67" on a catalogue line.
Browse the full sensor and instrumentation range, review the manufacturer brand index, or see how the same discipline applies to photoelectric sensor selection and vibration sensor mounting, where mounting choice and enclosure rating interact.
Send the application, the environment and the cleaning regime. We will return part numbers with the ingress test conditions stated on the datasheet.
Request a Sensor Recommendation →Not "better" — different. IP69K tests hot high-pressure jets at 80 to 100 bar and 80 °C from 10 to 15 cm, while IP67 tests temporary immersion to 1 m. Neither rating implies the other test. Choose by the regime your equipment actually sees: hot pressure washdown means IP69K, standing or temporary immersion means IP67.
Not automatically. Water-jet testing and immersion testing are separate procedures under IEC 60529, so an IP67 label is not by itself evidence of jet resistance. If your duty includes hose or jet exposure, ask for the jet rating explicitly rather than inferring it.
Dust-tight plus continuous immersion, with the depth and duration agreed between you and the manufacturer. This is the most abused rating in the industry: two IP68 parts can be tested to entirely different conditions. Require the stated depth in metres and duration in hours on the datasheet.
No. IP covers solid foreign objects and water ingress only. Corrosion, chemical resistance, UV, mechanical impact and operating temperature are all separate specifications, and each one has to be stated independently in your order.
No. The rating applies to what was tested as an assembly. An unsealed or unrated connector or cable gland means the installed system is only as protected as its weakest entry point. Specify connector and gland ratings, or use a pre-wired assembly rated end to end.