How to Use FLIR Thermal Cameras & Extech Moisture Meters for Predictive Maintenance: A 6-Step Checklist

When This Checklist Saves You Money

You're responsible for the health of industrial equipment—motors, pumps, tanks, electrical panels. You've got FLIR thermal cameras (CX5, E60) in your kit, maybe an Extech moisture meter, and a handful of signal converters and level transmitters to monitor. But are you actually using them in a way that prevents failures?

I'm a quality compliance manager at a mid-sized industrial services company. I review roughly 200 inspection reports per year. In Q1 2024, 12% of first submissions failed because inspectors skipped a step or misinterpreted readings. That cost us $22,000 in rework and delayed client projects. Since implementing the checklist below, the failure rate dropped to under 3%.

Here's the 6-step checklist I wish someone had handed me years ago. It covers the full loop: thermal scan → moisture check → signal verification → level alignment → cross-reference → documentation.

Step 1: Pre-Scan Setup — Know Your Equipment Baseline

Don't start shooting yet. First, pull the baseline data for the equipment you're inspecting. For example, if you're using a FLIR CX5 thermal camera, make sure the emissivity setting matches the target material (e.g., 0.95 for painted metal, 0.8 for uncoated steel). The FLIR E60 has a built-in palette and measurement modes—set it to 'spot' or 'area' depending on what you need.

I once spent 45 minutes scanning a motor bank only to realize the emissivity was wrong. The readings were all 15°C too low. Wasted morning. Now I always check the settings against a known reference point first.

Checklist:

• Confirm thermal camera lens is clean (a smudge can skew readings by 2–5°C).
• Set emissivity and reflected temperature per manufacturer spec.
• Record ambient temperature and humidity (affects thermal drift).
• For level transmitters, verify the zero point and span settings from the last calibration.

Step 2: Thermal Scan — Look for Hot Spots and Cold Spots

Scan the target equipment systematically. For electrical panels, start from the main breaker and work outward. For rotating equipment, capture the bearing housing and motor windings. The FLIR CX5 is rugged for industrial environments—I've dropped it twice without damage. The FLIR E60 gives you higher resolution (320x240) and better sensitivity (0.05°C). Both work fine for predictive maintenance.

I have mixed feelings about relying solely on max temperature readings. On one hand, a 10°C rise above baseline is a clear red flag. On the other, a uniformly hot panel could mean high ambient heat, not a fault. So I always compare against the same equipment under similar load conditions.

Common mistake: Only looking at the hottest point. A cold spot on a steam trap (below 100°C) might indicate a stuck-open valve. You'll miss it if you only chase high temps.

Step 3: Moisture Check — Use the Extech Moisture Meter to Rule Out Water Intrusion

Thermal anomalies can be caused by moisture. That's where the Extech moisture meter comes in. If you see a cold patch on a wall or insulation, switch to the moisture meter. How to use Extech moisture meter: Most models have two modes—pinless (scanning) and pin-type (invasive). For quick inspections, use pinless: press the sensor flat against the surface and look for readings above 15% (dry building materials read under 12%). If you get a high reading, confirm with pins to check depth.

Saved $400 once by catching a wet insulation blanket on a chilled water pipe before it rotted through. The thermal camera showed a cold line, moisture meter confirmed 30% moisture content. Repaired it same day instead of replacing a collapsed pipe section a month later.

Checklist:

• For each thermal anomaly, note the moisture reading at the same location.
• If moisture >15%, document as 'potential leak' and flag for follow-up.
• Calibrate the Extech meter every 6 months per factory spec.

Step 4: Signal Verification — Check Signal Converters and Level Transmitters

Now we get into the less obvious part. If you're working with process control equipment—tank level sensors, flow meters—your thermal scan might show nothing unusual. But the signal converter and level transmitter themselves can drift or fail. I've seen level transmitters that read 75% when the tank was actually 90% full. That's a process disaster waiting to happen.

To verify a signal converter: measure the output (typically 4–20 mA) at the transmitter and compare it to the actual process value. For a level transmitter, use a known reference—say, a sight glass or a tape measure—and see if the transmitter matches within ±1%. If not, the signal converter may need recalibration.

I'm not 100% sure on the exact tolerance for every brand, but in our plant, anything beyond ±1.5% triggers a work order. Check your OEM documentation. Roughly speaking, most industrial signal converters maintain ±0.5% accuracy under normal conditions.

Step 5: Cross-Reference — Connect Thermal, Moisture, and Signal Data

This is the step most people skip. You've got thermal images, moisture readings, and signal values. Now overlay them. For example:

• A hot motor bearing + a level transmitter reading that jumps erratically = possible pump bearing wear causing vibration affecting the level sensor.
• A cold patch on a steam line + a moisture reading >20% = failed insulation and potential corrosion under that lagging.

Take a photo with your FLIR camera that includes the instrument tag number. In the FLIR CX5, you can voice tag the image—I always say the asset ID and the reading. That saves hours during report writing.

Checklist:

• Create a simple spreadsheet with asset ID, thermal delta from baseline, moisture %, signal converter output, and action taken.
• If any two parameters are out of spec, escalate to engineering.

Step 6: Documentation — Standardize Your Report for Next Time

Document everything in a consistent format. Use the FLIR Tools software (free) or export CSV. Attach the thermal images with temperature markers. For the Extech moisture meter, log the readings in a table. For signal converters and level transmitters, include the mA output and the actual process value.

I've rejected reports where the inspector wrote 'looked fine' without numbers. That's useless for trending. You need a baseline to compare next quarter.

One more thing: Save your settings as a profile in the FLIR camera. The E60 allows you to name profiles like 'Electrical Panel' or 'Steam Traps'. Next time, just load the profile and you're already calibrated. Simple.

Common Mistakes to Avoid

• Relying on one tool alone. Thermal camera + moisture meter + signal verification gives you a multi-layered picture. Alone, each is incomplete.
• Skipping the baseline. You can't know if a reading is abnormal without knowing what 'normal' looks like for that asset.
• Forgetting to update firmware. FLIR cameras and Extech meters have periodic updates. As of January 2025, the FLIR CX5 firmware v2.3 adds better report exporting. Check yours.
• Ignoring the small costs. Saved $80 by not buying a calibration check kit? Ended up spending $500 on a re-inspection when the readings were off. Penny wise, pound foolish.

This checklist has saved us roughly $8,000 in potential rework over the last year. Not bad for a few extra minutes per inspection. Start with Step 1, and you'll catch problems before they become emergencies. Period.