IP Ratings for Machine Vision Illuminators: Understanding IP65, IP67 and IP69K

The IP code—Ingress Protection code, defined by IEC 60529—describes the degree of protection an enclosure provides against the intrusion of solid particles and liquids. For machine vision LED illuminators, the IP rating decides where the product can be deployed safely and which cleaning methods it can survive.

Choosing an illuminator with too low an IP rating for the application environment leads to premature failure. Choosing an unnecessarily high IP rating adds cost without benefit. Understanding what the IP code numbers mean is essential for making the right specification decision.

What IP Codes Mean: Solid and Liquid Ingress Protection

An IP code is made up of the letters IP followed by two digits. The first digit gives protection against solid particle ingress. The second digit gives protection against liquid ingress. A higher digit means a greater level of protection.

The first digit runs from 0 (no protection) to 6 (dust-tight). The second digit runs from 0 (no protection) to 9K (high-pressure high-temperature water jet). When a digit is not specified or not relevant, it is replaced with an X, for example IPX7 or IP6X.

First Digit: Solid Particle Protection

The solid particle protection scale covers six levels. The most relevant for machine vision illuminators are IP5X and IP6X.

IP5X means the enclosure is dust-protected. Some dust ingress is allowed, but not in quantities enough to interfere with the operation of the equipment. IP6X means the enclosure is dust-tight, with no dust ingress permitted under any conditions. For illuminators used in dusty production environments—woodworking, metalworking, food powder processing, or outdoor installations—IP6X is the right level.

Second Digit: Liquid Ingress Protection

The liquid ingress protection scale is more involved. Each level describes a specific test condition, and understanding these conditions matters for matching the rating to the actual environmental exposure.

IPX4 and IPX5: Splash and Water Jet Protection

IPX4 gives protection against water splashing from any direction. IPX5 gives protection against water jets from any direction at a flow rate of 12.5 litres per minute. These ratings suit environments where occasional water contact happens but direct jetting of the illuminator does not.

IP65: Dust-Tight and Water Jet Protected

IP65 pairs a dust-tight enclosure (first digit 6) with protection against low-pressure water jets from any direction (second digit 5). The water jet test uses a 6.3 mm nozzle at a flow rate of 12.5 litres per minute applied for at least three minutes from any direction.

IP65 is the most commonly specified rating for industrial machine vision illuminators in general manufacturing. It gives adequate protection against dust, coolant spray, cleaning water jets at moderate pressure, and condensation. It is not rated for direct immersion.

Most RODER Vision standard illuminators are available with IP65 protection as a selectable option. That covers the majority of industrial inspection applications outside food processing washdown and chemical environments.

IP67: Dust-Tight and Immersion-Rated to 1 Metre

IP67 gives a dust-tight enclosure plus protection against temporary immersion in water up to 1 metre depth for up to 30 minutes. This rating is needed for illuminators that may be submerged or flooded during operation or cleaning. It also suits outdoor installations where the illuminator may meet standing water.

IP67 calls for a sealed enclosure with no paths for water ingress under immersion. The sealing system has to hold its integrity over the operating lifetime of the product. Seals degrade over time, particularly under thermal cycling and chemical cleaning agents. The IP67 rating is validated at the time of manufacture, but ongoing seal integrity depends on the operating conditions.

IP68: Continuous Immersion at Specified Depth

IP68 is defined by the manufacturer and covers continuous immersion beyond 1 metre. The specific depth and duration have to be stated by the manufacturer. IP68 is needed for underwater inspection and for illuminators permanently installed in submerged or flooded locations. It is not a common requirement for standard machine vision applications.

IP69K: High-Pressure High-Temperature Steam Cleaning

IP69K is the most demanding liquid ingress protection rating in common industrial use. It was originally developed for road vehicle applications using high-pressure steam cleaning. It has since become the standard rating requirement for food processing equipment that undergoes regular washdown with high-pressure hot water or steam.

The IP69K test uses water at 80°C delivered at a pressure of 80 to 100 bar through a rotating nozzle 100 to 150 mm from the enclosure surface, applied from four angles for 30 seconds each. This test is far more severe than the IP67 immersion test or the IP65 water jet test.

An illuminator rated IP69K can survive the cleaning regimes used in food production, beverage processing, dairy, meat processing, and pharmaceutical manufacturing. An illuminator rated only IP67 or IP65 will fail when subjected to IP69K-level cleaning conditions.

Connector and Cable IP Rating Compatibility

The IP rating of the illuminator body is only part of the system protection level. The connector and cable assembly have to be rated appropriately too. An IP67-rated illuminator fitted with a non-sealed connector gives no effective protection at the connector interface.

M8 and M12 circular connectors are available in IP67 and IP69K-rated versions. The protection comes from sealing the mated connector pair, not the unmated connector. An unmated connector on an IP67 illuminator has to be protected with a sealing cap when not connected to a cable.

RODER Vision illuminators for washdown and food processing applications are specified with IP67 or IP69K-rated M8 or M12 connectors. The complete assembly—illuminator body, connector, and mating cable connector—is selected to give consistent protection throughout the system.

When Standard IP40 Protection Is Sufficient

Not all machine vision applications need high IP ratings. In clean, dry environments with no coolant, water, or significant dust, a standard IP40 or IP20 illuminator is enough. Over-specifying the IP rating adds cost to the illuminator without operational benefit.

Typical applications where standard protection is enough include electronics inspection cells in air-conditioned facilities, semiconductor inspection environments with HEPA-filtered air, and general component inspection in clean assembly areas. In these settings, the illuminator does not need sealed enclosures or special connectors.

Choosing the Right IP Rating for Your Application

The right IP rating comes from the actual environmental conditions in the inspection cell, not from a generic rule. Key questions to weigh: Is there dust or airborne particulate in the environment? Is the illuminator exposed to coolant, cleaning water, or chemical spray? What cleaning method is used, and at what pressure and temperature? Is the illuminator at risk of submersion?

A systematic approach maps the worst-case environmental exposure of the illuminator during both normal operation and cleaning or maintenance cycles. The IP rating chosen has to cover both. An illuminator that survives normal operation but fails during the weekly cleaning cycle is not an acceptable specification.

Products and Technologies

RODER Vision IP-Rated Illuminator Families

The RODER Vision families below are available with IP65, IP67, or IP69K protection levels. Each is designed and tested to meet the stated rating across the full operating temperature range.

Frequently Asked Questions