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Certified Infrared Thermographer Level I

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Certified Infrared Thermographer Level III

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Key Facts: ITC Level II Exam

>15°C

NETA Major Discrepancy (similar components)

ANSI/NETA MTS Table 100.18

40%

Minimum Load for Electrical IR

NFPA 70B 7.4.5

0.98

Water Emissivity (8–14 µm)

ITC Reference

10°C

Min ΔT for Building Envelope Survey

ASTM C1060

5 params

Required Camera Parameters

ITC Level II

80%

Infraspection Pass Mark (open book)

infraspection.com

The Certified Infrared Thermographer Level II certification from ITC / Infraspection Institute validates advanced quantitative IR thermography competency. Level II thermographers apply emissivity correction (reference emitter, tape, paint, and direct methods), measure reflected apparent temperature, correct for IR window transmittance, and classify findings per ANSI/NETA MTS Table 100.18 and ASTM C1060 guidance. They also perform trending and baseline comparison, supervise Level I inspectors, and produce complete inspection reports with severity classifications and corrective action recommendations.

Sample ITC Level II Practice Questions

Try these sample questions to review concepts for the ITC Level II exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 162+ question experience with AI tutoring.

1A thermographer measures a surface temperature of 85°C on a motor with an assumed emissivity of 0.95. The actual surface is bare aluminum with an emissivity of 0.05. The reflected temperature is 22°C. What is the most accurate statement about this measurement?
A.The reading is accurate because the camera was factory-calibrated
B.Reflected ambient radiation dominates the signal, so 85°C is unreliable
C.An emissivity of 0.05 makes the reading exactly 5% below the true value
D.Reflected temperature compensation has no effect once emissivity is entered
Explanation: An opaque surface with emissivity 0.05 has a reflectivity of 0.95, so 95% of the radiation leaving it toward the camera is reflected background rather than its own emission. The 85°C readout is therefore governed mainly by what the aluminium is reflecting, not by its temperature. Polished metal must either be corrected with a measured emissivity and reflected apparent temperature, or given a known-emissivity patch of tape or paint.
2Which emissivity correction method is MOST appropriate when you cannot touch or coat the surface being inspected?
A.Reference emitter method using black tape applied to the surface
B.Contact thermometer readings used to fix a reference temperature
C.Reflected apparent temperature from a crumpled foil reflector
D.Setting emissivity to 1.0 and subtracting the background by hand
Explanation: The reflected apparent temperature (RAT) method using a crumpled aluminum foil reflector pointed away from radiant sources can be performed without touching the surface. A foil reflector with very low emissivity approximates a perfect reflector; its apparent temperature, when pointed at the background radiation, gives the reflected temperature needed for proper compensation. This is standard ITC Level II technique for surfaces that cannot be coated or touched.
3A Level II thermographer inspects electrical switchgear through a germanium IR window rated at 80% transmittance across the 8-14 um band. The camera measures 68°C on a busbar. What correction must be applied?
A.No correction is needed because the window rating covers the loss
B.Divide the measured Celsius temperature by 0.80 to get the true value
C.Enter 0.80 as the camera transmittance so it compensates internally
D.Add 20% to the measured Celsius temperature to offset the window
Explanation: Radiometric cameras carry a transmittance (tau) parameter for measurements made through a window or other partially transmitting medium. Entering 0.80 lets the camera's radiometric equation restore the 20% of target radiance the window removed before it converts radiance back to temperature. Scaling a Celsius readout instead is wrong because radiance rises roughly with the fourth power of absolute temperature, not linearly with degrees Celsius.
4Using the similar-components column of ANSI/NETA Table 100.18, a busbar connection measures 2°C above a similar connection under similar loading. Which recommended action applies?
A.Major discrepancy; repair immediately
B.Indicates probable deficiency; repair as time permits
C.Monitor until corrective measures can be accomplished
D.Possible deficiency; warrants investigation
Explanation: ANSI/NETA Table 100.18 gives two reference columns. Against a similar component under similar loading the bands are 1-3°C (possible deficiency; warrants investigation), 4-15°C (indicates probable deficiency; repair as time permits) and greater than 15°C (major discrepancy; repair immediately). A 2°C difference sits in the first band, so the finding is documented and investigated rather than scheduled for repair.
5When setting up a camera for an outdoor inspection on a cold day (ambient 5°C), which parameters must the thermographer enter to ensure accurate temperature measurement?
A.Object emissivity only; ambient conditions do not matter outdoors
B.Emissivity, reflected temperature, air temperature, humidity, distance
C.Object emissivity and reflected apparent temperature, but nothing more
D.Atmospheric temperature and humidity only, since outdoor emissivity is 1.0
Explanation: Accurate quantitative thermal measurement requires all five camera parameters: (1) object emissivity, (2) reflected apparent temperature (background radiation), (3) atmospheric temperature (affects path attenuation), (4) relative humidity (water vapor absorbs IR), and (5) distance (determines path length). On cold, humid days all five matter — humid atmospheres absorb more IR, and cold backgrounds create significant reflected temperature errors on lower-emissivity surfaces.
6Black electrical tape of emissivity 0.95 is applied to a painted pipe and allowed to equilibrate. With the camera emissivity set to 0.95 the tape reads 51°C and the adjacent bare paint reads 48°C. What is the correct next step to find the paint emissivity?
A.Raise the camera emissivity on the bare paint until it reads 51°C
B.Lower the camera emissivity on the bare paint until it reads 51°C
C.Report 48°C for the paint and 51°C for the tape as measured values
D.Average the two readings and report 49.5°C as the pipe temperature
Explanation: The equilibrated tape gives the true surface temperature, 51°C. The bare paint reads low because its emissivity is below the 0.95 currently entered. Lowering the entered emissivity makes the camera subtract less reflected background and divide by a smaller emitted fraction, so the computed temperature rises. The emissivity value at which the bare paint also reads 51°C is the paint emissivity.
7ISO 18434-1 governs infrared thermography within machinery condition monitoring. What does it provide for judging the severity of a hot bearing housing?
A.A fixed 60°C alarm limit that applies to every rolling-element bearing
B.A requirement to judge every machine on absolute temperature alone
C.General procedures and comparison methods, but no fixed severity limits
D.A four-zone A to D table carried over from the ISO 10816 vibration work
Explanation: ISO 18434-1 is titled 'General procedures'. It covers survey planning, qualitative and quantitative thermography, error sources, and the use of reference and baseline temperatures, and it points to ISO 18436-7 for personnel qualification. It deliberately does not publish numeric alarm temperatures for bearings, because acceptable housing temperature depends on bearing type, lubricant, speed, load and ambient conditions.
8A thermographer compares two images of the same circuit breaker taken six months apart. The first shows a 4°C difference against a similar breaker; the current image shows 12°C under the same load. The BEST interpretation is:
A.Camera calibration has drifted, so the two images are not comparable
B.The fault is progressing; shorten the re-inspection interval
C.The change is within measurement uncertainty and can be disregarded
D.The fault has stabilised because 12°C is still below the 15°C limit
Explanation: Both readings sit in the 4-15°C similar-components band of ANSI/NETA Table 100.18, where the recommended action is repair as time permits. What matters is that the difference tripled in six months at unchanged load. Extrapolating that rate puts the connection past the 15°C boundary, where NETA calls for immediate repair, before the next annual survey. Trending therefore drives the inspection interval, not just the single-image classification.
9What is the primary purpose of establishing a thermal baseline for electrical switchgear?
A.To record the camera model and settings used during the inspection
B.To give later inspections a reference for detecting thermal change
C.To establish the ambient air temperature at the time of inspection
D.To satisfy an OSHA requirement for infrared inspection recordkeeping
Explanation: A thermal baseline documents the normal thermal signature of equipment under known load conditions. Future inspections compare against this baseline to detect temperature increases, pattern changes, or new anomalies that may indicate developing electrical or mechanical faults. Baselines are especially valuable for equipment types where absolute temperatures vary widely by design, making trend comparison more reliable than absolute thresholds alone.
10Which of the following emissivity values is MOST accurate for polished stainless steel?
A.0.05–0.10
B.0.12–0.18
C.0.45–0.60
D.0.85–0.95
Explanation: Polished stainless steel has an emissivity in the range of approximately 0.10–0.16 in the 8–14 µm thermal IR band. This puts it in the low-emissivity category typical of polished metals. Emissivity varies by surface condition — oxidized or bead-blasted stainless can reach 0.3–0.6, while polished mirror-finish stainless is 0.10–0.18. Level II thermographers must know these ranges to choose appropriate measurement methods.

About the ITC Level II Exam

The ITC / Infraspection Institute Level II Certified Infrared Thermographer exam tests advanced quantitative thermography skills including precise temperature measurement with emissivity correction, severity classification per ANSI/NETA MTS Table 100.18, trending analysis, and QA/QC of Level I inspector work.

Exam sponsor: Infrared Training Center (ITC) / Infraspection Institute. The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Assessment

Question count not published by the exam provider

Time Limit

Not published by ITC or Infraspection

Passing Score

80% (Infraspection open-book exam); ITC cut score not published

Exam / Certification Fees

Bundled with the Level II course (not published separately)

Exam sponsor website

Fees, eligibility, and exam policies can change. Confirm them with the exam sponsor before applying or paying.

Our practice resources: topics covered

We aim to reflect publicly available exam outlines and topic information in our study resources. Coverage, format, and difficulty may differ from the actual exam, and we cannot guarantee that every detail is accurate or current. Confirm exam requirements, fees, and policies with the official exam sponsor.

Not published

Emissivity Correction & Measurement Setup

Reference emitter, tape, paint, and direct methods; reflected apparent temperature; IR window transmittance; camera parameter setup

Not published

Severity Classification Standards

ANSI/NETA MTS Table 100.18 thermographic survey criteria (similar-component and over-ambient ΔT bands), NFPA 70B minimum-load and interval rules, ASTM C1060 building envelope ΔT requirements

Not published

Data Analysis & Pattern Interpretation

Electrical fault patterns, mechanical defect signatures, building envelope anomalies, steam system inspection

Not published

Trending & Baseline Comparison

Establishing baselines, rate-of-change analysis, trend escalation criteria, multi-year data analysis

Not published

QA/QC of Level I Work

Parameter verification, equipment identification review, coverage completeness, finding reclassification

Not published

Reporting Standards & Professional Ethics

Report content requirements, image documentation, professional ethics, client communication

Preparing for the ITC Level II Exam

What You Need to Know

  • Passing score: 80% (Infraspection open-book exam); ITC cut score not published
  • Assessment: Question count not published by the exam provider
  • Time limit: Not published by ITC or Infraspection
  • Exam / certification fees: Bundled with the Level II course (not published separately) Official sources

Using Our Practice Resources

  • Work through all 162 available questions
  • Review every answer and explanation
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ITC Level II: Suggested Study Strategy

1Memorize ANSI/NETA MTS Table 100.18: similar components 1–3°C possible deficiency, 4–15°C probable deficiency, >15°C major discrepancy; over ambient 1–10 / 11–20 / 21–40 / >40°C
2Know emissivity ranges by material: polished metals 0.05–0.15, oxidized metals 0.30–0.80, paints/plastics/water 0.85–0.98
3Practice all four emissivity correction methods — tape, paint, RAT foil reflector, and direct
4Understand that all five camera parameters must be correct: emissivity, RAT, atmospheric temp, RH, and distance
5Review the ASTM C1060 10°C ΔT condition for building envelope and flat roof inspection protocols
6Know the Level II QA/QC responsibilities: parameter verification, equipment ID, coverage completeness, and reclassification

Frequently Asked Questions

What is the ITC Level II thermographer exam?

The ITC (Infrared Training Center) / Infraspection Institute Level II Certified Infrared Thermographer exam validates advanced quantitative IR thermography skills. Level II thermographers must demonstrate mastery of emissivity correction methods, severity classification per ANSI/NETA MTS Table 100.18, trending and baseline analysis, and QA/QC review of Level I work. The exam covers electrical, mechanical, and building envelope thermography applications.

What emissivity correction methods are tested at Level II?

Level II exams cover four emissivity correction methods: (1) Reference emitter — applying tape or paint and iterating camera emissivity until surfaces read the same; (2) Contact thermometer — measuring true temperature and back-calculating emissivity; (3) Reflected apparent temperature (RAT) — using a crumpled foil reflector to measure background radiation without touching the surface; and (4) Direct measurement using camera software with published emissivity tables. Polished metals (ε=0.05–0.15), oxidized metals (ε=0.30–0.80), and paints/plastics (ε=0.85–0.95) are key material groups.

What are the ANSI/NETA MTS severity criteria for electrical thermography?

ANSI/NETA MTS Table 100.18 classifies anomalies by ΔT. Against a similar component under similar load: 1–3 °C = possible deficiency (warrants investigation), 4–15 °C = probable deficiency (repair as time permits), above 15 °C = major discrepancy (repair immediately). Over ambient air: 1–10 °C possible deficiency, 11–20 °C probable deficiency, 21–40 °C monitor until corrective measures can be accomplished, above 40 °C major discrepancy. There are no numbered priority levels; NETA notes the bands are reasonable guidelines and that temperature rise scales roughly with the square of current.

How does Level II differ from Level I thermography certification?

Level I thermographers perform qualitative or limited quantitative scanning under supervision. Level II adds: full quantitative temperature measurement with emissivity and atmospheric corrections, severity classification against NETA/ISO/ASHRAE standards, trending and baseline comparison across multiple inspections, QA/QC review and sign-off authority for Level I data, and authorship of complete formal inspection reports with corrective action recommendations.

What does the ITC Level II exam cover for building envelope thermography?

Building envelope topics include the ASTM C1060 suggested minimum ΔT of 10°C (18°F) interior-exterior for 4 hours for meaningful wall inspections, interior mode during heating season for insulation defect detection, flat roof inspection protocols (1–4 hours post-sunset, wind <15 mph per ASTM C1153), air infiltration detection using blower door combined with IR, thermal bridging through structural framing, and interpretation of warm/cool pattern signatures for moisture, air leakage, and insulation defects.