IP65 vs IP67 vs IP69K — Load Cell Protection Ratings Explained for Industrial Applications
- Cody
- 4 hours ago
- 4 min read
Understanding Water, Dust, and Chemical Resistance in Modern Weighing Systems
Load cells are exposed to more than just weight — they operate in real environments impacted by dust, vibration, condensation, liquid washdown, cleaning chemicals, high-pressure spray, and submersion. The wrong load cell rating can result in signal drift, rust, failure, inaccurate readings, or complete system replacement.
This long-form guide breaks down IP65, IP67, and IP69K — the three most common industrial load cell protection ratings — and provides recommended applications and load cell types for each one.
🧪 What Does “IP” Rating Actually Measure? (Technical Breakdown)
“IP” stands for Ingress Protection. The rating contains two digits:
Example | First Digit | Protection Against | Second Digit | Protection Against |
IP67 | 6 | Dust & solids | 7 | Water |
First Number (Solids):
6 = Completely dust-tight (highest rating)
Second Number (Liquids):
Higher number = Better water protection
5 protects against water jets
7 protects against submersion
9K protects against HIGH PRESSURE + HIGH TEMPERATURE cleaning
This second digit is the key difference for food, chemical, and washdown industries.
⚙ Engineering Perspective — What Gets Damaged?
Moisture or chemical intrusion causes:
Strain gauge corrosion
Zero drift / span instability
Delamination in bonded foil gauges
Thermal expansion / contraction damage
Cable wicking (water travels through cable into housing)
Failure of solder bonds
Void contamination in hermetic seals
Most failures are NOT instant — they show up as:
Weight fluctuates
Calibration won't hold
Load cell “recovers” when dried
Indicator alarms (mv output out of range)
This is why IP65 is not suitable for environments using caustic foam cleaners, steam, or frequent hot water sanitization.
🔧 IP65 — “Dry Environment or Light Splash”
Definition (Technical):
Completely protected from dust
Protected from low-pressure water jets (6.3 mm nozzle @ 30 kPa)
Best for industries where equipment is wiped, not washed:
Dry food packaging
Laboratories
Retail POS scales
Warehouses
Fulfillment centers
Packaging stations (without soap or sanitizers)
Avoid IP65 when:
Employees use hoses
Steam or heat is present
Cleaning agents are used
You operate outdoors
If liquid cleaning is part of the process → IP65 is the bare minimum, NOT ideal.
🌧 IP67 — “Moisture, Washdowns, and Temporary Submersion”
Definition (Technical):
Dustproof
Survives submersion: 1 meter for 30 minutes
Typical construction:
Epoxy or potted cavity
Sealed cable entry
Not hermetically welded
Best for:
Outdoor or agricultural scales
Truck platforms with snow & rain exposure
Cold storage (condensation cycles)
Packaging lines with occasional water rinse
Marine docks, fisheries, ports
Brewery & beverage facilities
Key advantage: Handles environmental moisture, NOT pressurized sanitation.
If exposed to:
Chlorine
Peracetic acid
Dissolved salt
Degreasers→ IP67 alone may not hold up long-term.
🚿 IP69K — “High Pressure + High Temperature + Chemical Foam”
Engineered for meat, dairy, poultry, seafood, beverage, and pharmaceutical sanitation.
IP69K Test Specs (DIN 40050-9):
Spray Temp | Up to 176°F (80°C) |
Pressure | 1,450 psi (100 bar) |
Distance | 4–6 inches |
Spray Angle | 0°, 30°, 60°, 90° |
Add chemicals (alkaline foam, acids), and lower-rated load cells fail fast.
IP69K construction often includes:
Hermetically welded stainless steel
Laser welded strain gauge chamber
Glass-to-metal seals
Oversized cable strain relief
Non-wicking cable jackets
Best for:
USDA food plants
Cheese & dairy plants
Bottling lines
Pharmaceutical production
Chemical batching
Seafood and marine sanitation
If steam, foam, or power washing is part of the cleaning procedure → IP69K is required.
When Should You Choose Each Rating?
Environment Condition | Minimum Rating |
Clean, dry, indoor | IP65 |
Occasional rinse / outdoor | IP67 |
Power wash / steam sanitation | IP69K |
When uncertain — go up one level.
Because load cell replacement often requires downtime + recalibration, over-rating is less expensive than failure.
Cost Difference: Is IP69K Worth It?
IP69K costs more upfront
But reduces downtime
And prevents inventory contamination (food/chemical sector)
And extends service interval
And reduces replacement frequency
Engineers call this: “Total cost of ownership,” not purchase price.”
Final Recommendation
Industry | Suggested Rating |
Retail & dry goods | IP65 |
Outdoor, farming, beverage | IP67 |
Meat, dairy, pharma | IP69K |
If you sell equipment to customers, choosing a higher rating reduces warranty claims and protects your reputation.
Recommended Load Cells by Rating
🚧 Indoor & Dry Industrial (IP65)➡ RL1521A | RL1010 | RL1380 Aluminum
🌧 Outdoor & Moisture-Prone (IP67)➡ RL1140 | RL20001I | RL1380 Stainless
🚿 Heavy Wash-Down (IP69K)➡ RLPWM15HE | RLPC6 | RL32018S-T
📘 Need Help Choosing a Load Cell?👉 Check out our Load Cell Buyer’s Guide👉 Contact Us
FAQ — IP65, IP67 & IP69K Load Cell Ratings
Do I really need a waterproof load cell?
If your scale is used where water, cleaning spray, or moisture is present, you should choose a waterproof or sealed load cell. Water inside a load cell causes inaccurate readings, corrosion, and early failure.
Is IP65 good enough for normal shop or warehouse use?
Yes — IP65 works well indoors where equipment is wiped clean and not sprayed down. If your scale is in a dry area, IP65 is the most affordable and appropriate option.
What’s the difference between IP67 and IP69K?
IP67 protects against temporary water exposure or accidental splashes.IP69K protects against high-pressure, high-temperature wash-down cleaning — commonly required in food, chemical, and sanitation environments.
If I choose a higher IP rating, does the scale last longer?
Usually yes. A load cell with a higher protection rating is less likely to fail due to moisture, chemicals, or cleaning. It may cost more upfront but often reduces long-term replacement costs.
Can I upgrade a scale to a better IP-rated load cell later?
In many cases, yes — as long as the mounting pattern and capacity are compatible. It’s best to check the model of your current scale or contact us for recommendations.
Comments