Elcometer 224 – Measuring Surface Roughness According to Standards
The correct surface roughness is crucial for the adhesion of coatings. With the Elcometer 224 Digital Surface Profile Gauge, you can measure the roughness profile quickly, reproducibly, and in compliance with standards – on both flat and curved surfaces. This practical guide shows you which model is suitable, how to measure correctly, and how to avoid typical errors.
Product Overview: Models & Application Areas
| Model | Feature | Typical Use |
|---|---|---|
| Model B | Instant measurement without memory | Individual checks, construction sites |
| Model T | Memory, statistics, Bluetooth | Documentation, QA, Reporting |
0–500 µm (20 mils)
50+ readings / minute
ASTM D4417-B, SSPC PA17, SANS 5772
Never measure just a single point. For a meaningful evaluation, Elcometer recommends several spot measurements per area – only the average value is decisive.
Recommended Basic Settings (Guideline Values)
- Measurement Mode: Standards (e.g., ASTM D4417-B)
- Number of Individual Readings: 5 or 10 per spot
- Unit: µm
- Calibration: Before starting work on a glass zero plate
Note: Settings depend on the standard, coating system, and client – specifications are provided as guideline values.
Pro-Workflow: How to Measure Surface Profile Correcty
- Visually inspect the device and probe
- Perform calibration on a glass zero plate
- Place the probe vertically (90°)
- Take 5–10 individual readings per spot
- Record multiple spots per area
- Document the average value
Typical Errors & Solutions
- Fluctuating values: Do not tilt the probe, clean the surface
- Implausible measurements: Check calibration
- Deviations: Perform more spot measurements
- Outliers: Check Max instead of Mean value
Maintenance & Care
- Regularly check the probe tip
- Recalibrate after replacing the tip
- Store the device in a dry place
- Use the protective cap
- Keep firmware up to date via ElcoMaster
FAQ – Common Practical Questions
Which probe for pipes?
Convex probe with a separate connector.
How often to calibrate?
Before starting work and after changing the probe.
Model B or T?
Model T for documentation & QA.
Reading: Mean or Maximum?
Depends on the standard & specification.
Is Bluetooth mandatory?
No, but practical for reports.
Conclusion:
The Elcometer 224 is a robust, standard-compliant measuring device for anyone
who needs to safely evaluate surface profiles – from corrosion protection to quality control.
