ETher Maxwell PECT In-Service Inspection System

ETher Maxwell PECT In-Service Inspection System

Pulsed Eddy Current Inspection System


With unbeatable inspection capability and a truly simple user interface, the Maxwell PECT is an unmatched system in the field. A no nonsense, capable and flexible PEC inspection tool which has developed for harsh industrial environment inspections as well as applications in splash zones, subsea inspections and ROV deployments. The Maxwell PECT instrument is designed for the inspection of carbon steel and low-alloyed steels, which are magnetic. For magnetic test specimens, the eddy currents are concentrated on the surface directly after the magnetic pulse. Subsequently, the eddy currents diffuse into the test specimen, until the backwall is “found”. This results in a characteristic shape A-scan: a straight line, corresponding to the diffusion of the eddy currents, followed by curved section when the backwall is sensed. Weighing in at 7.5 kg (16.5lbs), including the batteries, the Maxwell system is highly portable; and with a typical battery life of 8 hours is an ideal inspection partner in the field.



Underwater Probe set covering different depth ratings & lift-off ranges


  • Large range in wall thickness, up to 2" (50mm) and insulation thickness combined, hence well suited to vessel inspection not just piping/pipelines
  • Maximum Lift-Off range is 0-10” (0 – 250 mm)
  • A maximum surface temperature of up to 1020 °F (550 °C)
  • Superior signal to noise ratio
  • Four standard probes, each for a different lift-off range. The probes are optimized for defect sensitivity. Underwater probe sets are available covering different depth rating and lift-off ranges
  • Extremely robust design delivers outstanding performance under the typical rigours associated with on-site inspection
  • Standard set is splash water tight, salt and fog resistant, meets IP65
  • Intuitive software has been developed with the NDT technician in mind, fast data collection, real time data analysis, simple reporting on-board the instrument and on your desktop PC
  • Excel format data provides easy compatibility with other applications
  • No hidden costs - all inclusive lifetime pricing means no annual software support fees
  • Ruggedized tablet computer on-board connected to a data acquisition unit

Probes S, M, L and XL with and without encoder attachments

What is PECT?

Pulsed Eddy Current Testing (PECT) is an inspection technique for inspecting carbon steel objects such as pipes and vessels, without the need for contact with the steel surface. PECT can measure percentage variations in steel thickness through any non-conductive and non magnetic materials between sensor and surface such as air, insulation material, concrete, plastics, coatings, sea water and marine growth, paint, deposits, oil, composite repairs, fireproofing, “scabs” aluminum sheeting and other non-magnetic insulation covers; so ideal for Corrosion Under Insulation (CUI) applications. Previous instruments often lacked the power to be fast and effective.

Using the latest battery technology, the Maxwell PECT is a novel and very powerful PECT instrument with a design based on 25 years’ hands-on experience at a global Oil Company.


Applications include:

  • Corrosion under fire proofing e.g. storage sphere legs
  • Inspection of column skirts
  • Flow accelerated corrosion (power plants)
  • Splash zone of offshore structures and risers
  • Subsea Pipelines, well casings, repair wraps
  • Ship Hulls
  • High Temperature wall thickness monitoring


Flat PEC Probe

In-Service PEC Inspection of Storage Tank Annular Rings

Maxwell NDT has developed a flat PEC probe that can be inserted underneath the annular ring of a tank floor for in-service inspection. The Maxwell PECT is powerful enough to measure through thick layers of corrosion products (iron oxides) underneath the tank floor, which is essential for annular ring inspection. The removal of corrosion materials is clearly unacceptable for in-service inspection, as this may trigger a leakage, but with the Maxwell PECT system this removal process is not required.


  • Compact magnetic field increasing defect sensitivity
  • High range in WT, 2.0” (5.0cms), and insulation thickness so also suited for vessels, not just piping
  • Fast single pulse including at high insulation thickness
  • Scanning possible also at high lift-off
  • Powerful batteries, with hot-swap capabilities
  • Robust, designed for use outdoors, very easy to use in field

Technical Specifications

Maxwell PECT Standard Specifications

Data Acquisition Computer DURABOOK U11i Touch screen with LED backlight Sunlight Readable Display. Ambient Light Sensor, screen protector, Navigation keypad/ “Quick” keys, 8GB memory, 250 GB SSD
Standard Probes Four standard probes, types S (small), M (medium), L (large) and XL (extra large) Nominal lift-off ranges: (S)0-20mm (0 0.78ins); (M) 25mm-75mm (0.98-2.95ins); (L) 40mm-125mm (1.57-4.92 ins) and (XL) 75mm-250mm (2.95 9.84ins). Probe selection is automated in the set-up
Batteries Main battery, typical life: 8 hours; external chargers ensure no down time due battery recharging. Hot-swappable.
Computer battery is recharged automatically from the main battery, if charge drops below 20%, so no spare battery swap is required
Communication Wi-Fi, Bluetooth, USB 3.0
Environment Meets IP65. Salt and Fog resistant
Operating Temperature -4 to 104 °F (-20 to 40 °C)
Humidity and Pressure Relative humidity < 93%
Atmospheric pressure 70 – 105 kPa
Compliance CE, RoHS, FCC Part 15B
Dimensions 13" x 10.2" x 6" (33 cm x 26 cm x 15 cm)
Weight 16.5 lbs. (7.5 kg) (includes batteries and data acquisition computer)
The instrument is provided with 2 hoisting lugs
Transport of Standard Set Operator transport is possible using the rucksack included in the set and instrument carrier belt.
Air/Road transport in three Explorer cases (type 4830), 20" x 17.7" x 9.5" (52cm x 45 cm x 24cm). Weight 31 lbs. (14 kg) each
Transport of 25m Extension Lead One Explorer cases 5823, 26.3" x 20" x 10.25" (67cm x 51 cm x 26cm) . Weight 15kg (33lbs).
Cable is configured in a figure eight
Transport of Splash Zone Probes One Explorer case, 7630, each 34" x 22" x 14" (86 cm x 56 cm x 36 cm)
Weight 50m umbilical length: 68 lbs. (31 kg)
Operation and Software
Measurement Parameters Probe selection and measurement parameters are automatically set at start of an inspection using test measurements
Data Storage Software All PECT signals are fully stored in data files for verification purposes
Data Collection Software GUI user interface, Customizable
Direct reporting to MS Excel
Data Collection Speed Typical recording speed (second per reading):
0.19" <WT≤ 0.47" 0.5s (3mm< WT ≤12mm 0.5s)
0.47" <WT≤ 0.98" 1s (12mm< WT ≤25mm 1s)
0.98" <WT≤ 1.97" 2s (25mm< WT ≤50mm 2s)
Note: the measurement time depends on a number of parameters that are hard to quantify, such as pipe vibration
Data Collection with Position Encoder Data can be recorded with and without position encoder:
Point-to-point measurements by manual or remote trigger.
Dynamic Scanning: measurement triggered by encoder while moving the probe, ideal under favorable circumstances
Stop & Go Data Collection: measurements triggered when encoder detects that probe is steady; applicable under less favorable circumstances
PC Reporting Software Unlimited and license free copies of PC-based analysis software provided for Windows 10/ MS Excel
Report Generation Microsoft Excel Reports are generated in both instrument software and PC-based analysis software. Report layouts can be customized 
Language English, French, Spanish and other languages available
Typical Performance Parameters
Wall Thickness Range 2-65mm (0-1.97in) steel
Maximum Lift-Off Range 0-250mm for WT ≤ 15mm (0-9.84" for WT ≤ 0.6")
0-200mm for 15mm < WT ≤: 30mm (0-7.8" for 0.59" <WT ≤ 1.2")
0-100mm for 30mm < WT ≤: 65mm (0-3.9" for 1.18" <WT ≤ 1.97")
Minimum Pipe Diameter 0mm (0") insulation: 25mm (1.0")
50mm (1.97") insulation: 75mm (3")
50mm (2.0") OD can be inspected with footprint around full pipe circumference
Insulation Sheeting Aluminium & stainless. Performance on galvanized (magnetic) sheeting depends on properties
Footprint Diameter Typically 1.5 times the thickness of the insulation, with a minimum of 25mm (0.98").
Measurement Accuracy PECT measures steel thickness averaged over it’s footprint area with a typical accuracy of ±10%
Robotic PECT - Including Underwater ROV Specifications

Robotic PECT General Info

Compatible with probes, cables and software of portable PECT.

Can be connected to maximum twelve (12) PECT probes; extension to maximum 48 probes is optional.

Probes can record data in maximum four groups that are excited together. For example, the system can be configured to measure probes 1, 5 and 9 in cycle 1; subsequently probes 2, 6 and 10 in cycle 2; probes 3, 7 and 11 in cycle 3 and probes 4, 8 and 12 in cycle 4. Other grouping is possible.

One on-board industrial computer for the data acquisition program.

Connection to master computer with Ethernet communication.

Two encoder inputs.

Three digital out signals (TTL), which can e.g. be used for motor control.

Is supplied with electronics board mounted on a frame, selected internal connectors are accessible to the user for (re)-configuration by the user. Full documentation of the electronics connections is provided with the set.

Housing can be re-arranged to suit operator needs.

Optional Items Same as portable topside MAXWELL PECT
Underwater housing for different depth ratings
Data Acquisition Computer POC 212. 8 GB memory, 250 GB SSD control via LAN network Option to connect to another data acquisition computer (requires Window 10); software key which is required will be provided for free
Probes Compatible with all MAXWELL NDE probes
Communication Ethernet & RS485 (not standard)
Environment The Robotic system is delivered on a frame, which is designed for placing in a pressure housing.
Housing can be in pressure containers, depending on the customer requirements such as number of probes, application above or below water and depth rating
Temperature -4 to 122 °F (-20 to 50 °C)
Humidity and Pressure Relative humidity < 93%
Atmospheric pressure 70 – 105 kPa
Compliance CE, FCC Part 15B
Dimensions 20" x 6" ᴓ6" (510mm x 150mm ᴓ150mm)
Weight 28 lbs. (12.7 kg), including batteries and data acquisition computer

Transport Case 1: PECT instrument, optional tank floor probe, computer mouse, battery charger and AC adapter

Transport Case 2: Two NiMH batteries, four standard probes, connector piece and documents. Probe and encoder compartment

Transport Case 3: Contains two 8m long Signal cables, reference plate, encoder plates and a rucksack

Standard Kit Includes

  • One PECT instrument: data acquisition unit permanently connected to a U11i Durabook tablet for data acquisition
  • Tablet includes
    • High Capacity Battery
    • Bluetooth Mouse
    • AC Adapter
  • Four standard probes, with protector shoes & wear piece
  • Two signal cables, each 8m (26.25ft) long, for any probe
  • Two vibration-suppression shims
  • Two main batteries for PECT instrument
  • One external charger for the main battery 110v-230V
  • Reference plate for functional check by operator, annual remote calibration by Maxwell NDT



  • One-axis position encoder that can be attached to each of the four standard PECT probes (S, M, L and XL)
  • Flat probe for in-service inspection of annular ring atmospheric storage tanks
  • Splash zone probe, 30m (98.5ft) water depth
  • Underwater probe, 1500m (4921ft) depth rating
  • Option for multi-probe robotic deployment
  • 29m (95ft) long signal cable in transport case; different lengths are available on request
  • 100m long underwater umbilical in transport case; different lengths are available on request
  • Telescopic pole; 1.8m (5.9ft) collapsed – 6m (19.7ft) extended
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