UNI-T UT343A Calibration and Zero Check What to Do Before Measuring Malaysia
UNI-T UT343A Calibration and Zero Check What to Do Before Measuring Malaysia Content A coating thickness gauge switches on normally, but does that mean every reading is automatically correct? Not necessarily. Before using the UNI-T UT343A Coating Thickness Gauge for automotive paint, powder coating, fabrication or factory QA/QC, users should understand the importance of measurement verification, zero checking, substrate condition and correct probe technique. If a coating thickness gauge suddenly gives unusual or inconsistent readings, do not immediately assume that the coating is the problem. The instrument and measurement conditions should also be checked. Why Check a Coating Thickness Gauge Before Measurement? A coating thickness gauge may be used to make decisions about: Product quality Coating consistency Repainting Production acceptance Maintenance Customer inspection Automotive body condition If the measurement is incorrect, the decision based on that reading may also be incorrect. A quick verification before important measurements can therefore reduce unnecessary disputes and rework. What Is a Zero Check? A zero check helps verify the instrument response on a suitable uncoated reference substrate. For example, if you are measuring a coating over steel, an appropriate uncoated steel reference can be used according to the instrument's operating procedure. For non-ferrous applications, the correct corresponding reference substrate should be used. The objective is to confirm that the gauge has an appropriate reference before relying on coating measurements. Fe and NFe Must Not Be Confused The UNI-T UT343A supports: Fe Ferrous metal substrates and NFe Non-ferrous metal substrates Examples: Steel → typically Fe Aluminium → typically NFe When checking or verifying the instrument, use a reference material appropriate to the intended measurement. Do not assume that verification on one substrate automatically represents every other substrate and geometry. When Should You Check the Instrument? A verification is particularly useful: Before an important inspection After long-term storage When readings suddenly look unusual After changing to a significantly different substrate When measurement results are disputed Before recording QA/QC results If the instrument has been dropped or damaged For routine industrial use, establishing a consistent pre-measurement checking procedure can improve confidence in the results. What If the Reading Does Not Return to the Expected Value? If the instrument produces an unexpected result, check the basics first. 1. Clean the Probe Inspect the probe contact area for: Dust Oil Dirt Coating residue Physical contamination Even a small amount of material between the probe and surface can influence measurement. 2. Clean the Reference Surface The reference substrate should also be clean. Do not verify the gauge against a dirty, rusty or badly damaged surface and expect ideal results. 3. Keep the Probe Straight Place the probe perpendicular to the surface. Avoid: Tilting Sliding Excessive movement Measuring while the probe is unstable Take several readings and compare them. 4. Check the Measurement Location Measurements near: Edges Corners Small-radius curves Irregular surfaces may behave differently from measurements on a large, flat surface. Try a more suitable location before deciding that the instrument is faulty. Calibration Is Not the Same as Zero Checking These terms are sometimes used interchangeably, but they should not automatically be treated as the same process. A zero check or user adjustment is part of preparing or verifying an instrument according to its operating procedure. A formal calibration generally involves comparison against traceable reference standards under defined conditions and may include documented results or a calibration certificate. For QA systems, audits or customer requirements, confirm what type of calibration documentation is actually required. Example: UT343A Gives 160 μm Instead of Around 100 μm Suppose a coated component is normally expected to be around 100 μm, but the UT343A suddenly shows: 158 μm 164 μm 161 μm Do not immediately conclude that the coating process has failed. A better troubleshooting sequence is: Step 1: Repeat the measurement. Step 2: Clean the probe and surface. Step 3: Check another known area. Step 4: Verify the instrument using an appropriate reference. Step 5: Compare with another verified instrument if available. Step 6: Investigate the coating process if the higher readings remain repeatable. This separates an instrument problem from a real coating variation. Why Repeatability Matters Suppose repeated measurements at the same suitable location produce: 121 μm → 122 μm → 120 μm → 121 μm The results are relatively consistent. Now compare: 121 μm → 168 μm → 103 μm → 147 μm Large unexplained variation should trigger further investigation into: Probe technique Surface condition Substrate Measurement location Instrument condition Verification status Repeatability is therefore an important part of troubleshooting. UNI-T UT343A for QA/QC Measurement The UNI-T UT343A provides: 01750 μm measuring range Fe/NFe substrate support Automatic substrate recognition Single measurement Continuous measurement MAX/MIN/AVG 199 data storage μm/mil selection Upper and lower limit settings These functions make it useful for routine coating inspection in: Metal fabrication | Powder coating | Automotive | Manufacturing | Maintenance | QA/QC Coating Thickness Gauge Checking and Support Malaysia If your coating thickness gauge gives suspicious readings, provide the following information when requesting technical assistance: Brand & Model: UNI-T UT343A or other model Problem: Unstable / high / low / no reading Substrate: Steel / aluminium / other Coating: Paint / powder coating / other Expected Thickness: Approximate value Location: Malaysia This Brand × Problem × Service × Location information helps identify the likely issue much faster. For users in Kuala Lumpur, Selangor, Johor, Penang, Melaka, Negeri Sembilan, Perak, Pahang, Kelantan, Terengganu, Kedah, Perlis, Sabah and Sarawak, contact MTM Precision for instrument enquiries and technical assistance. MTM Precision Sdn Bhd Showroom & Service Centre: Puchong, elangor, Malaysia Tel: 03-8080 7172 WhatsApp: +6016-660 7346 Email: mtmpre@yahoo.com Website: www.mtmpre.com.my If your UNI-T UT343A or coating thickness gauge is giving unusual readings, WhatsApp us the model, photos of the instrument and several example readings for an initial assessment.
22 Sep 2026
