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What Does the IP Rating of a Load Cell Mean?

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The IP (“International Protection” or sometimes “Ingress Protection”) rating of a load cell is an international standard marking on all electrical devices. It specifies how well that electrical device is protected from “ingress” or intrusion of solid objects, liquids, dust or unintentional contact.

This rating system was developed to avoid the use of more general terms like “water-resistant”. It consists of the prefix “IP,” followed by two digits (or an “X” in place of a digit) and possibly the letter “K” after the digits. All load cells sold by Tacuna Systems fall into the range of IP65 to IP69K (the highest rating, or most protective).

IP Rating Format

The two sections below explain the format of the IP rating system of ingress protection. For a quick illustrated summary, see the infographic at the end of this article.

The IP Rating’s Mandatory First Two Digits

The first two digits after the IP in the rating are mandatory, according to the standards document, IEC 60529, that defines the rating system. The first digit gives the device’s protection from intrusion of solid objects, and has a range of 0-6. The second digit ranges from 0-9K and indicates the level of protection from liquids from various angles, pressure and temperature. An “X” appears in place of either digit to signify that there is no known level of protection for that environmental factor.

Note that the IEC specifications have a highest liquid intrusion rating of “8”. The value “9K” comes from the German standard DIN 40050-9, and is widely accepted internationally. This rating implies the device protects against all lower described scenarios of water intrusion.

The tables below define the levels of IP for each mandatory digit.

First Digit: Protection From Intrusion of Solids

Rating ValueMinimum Object Size of No Ingress
1> 50 mm
2> 12.5 mm
3> 2.5 mm
4> 1 mm
5Limited dust ingress
6Dustproof
XNo data available

Second Digit: Protection From Intrusion of Water

Rating ValueScenario of Liquid Exposure
Where Protection is Offered
1Vertically falling droplets
2Droplets falling up to +/- 15 degrees from vertical
3Sprayed up to 60 degrees from vertical
4Splashed from any direction
5Jets of water any direction
6Forceful jets of water
7Immersion up to 15 meters for 30 minutes or less
8Immersion under pressure for any duration
9K (German Standard DIN 40050-9)High-temperature water jets (for wash-down applications)
XNo data available

The IP Rating’s Optional Alpha Characters

In addition to the mandatory numeric characters, the following alpha characters may optionally appear in an IP rating.

Other Protections

The first optional letter specifies protection from ingress where human interaction is possible, as follows:

LetterAvoids Ingress Of
ABack of Hand
BFinger
CTool
DWire

Supplemental Protections

The second optional letter specifies the protection of equipment specific to the following environmental conditions:

LetterMeaning
HHigh voltage apparatus
MMotion during water test
SStationary during water test
WWeather conditions

Conclusion

The international standard IP rating appears on all load cells, as you will see if you browse Tacuna Systems’ online load cell catalog. The graphic below neatly summarizes the marking’s format.

Explanation of letters and digits in Ingress Protection standard marking
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