Description
Evident 39DL PLUS Thickness Gauge Repair
The 39DL PLUS is the high-penetration corrosion gauge in the Evident range, covering 0.08 mm to 635 mm depending on material and transducer, with THRU-COAT technology that reads true metal thickness through paint and coatings from a single backwall echo, plus echo-to-echo modes. It updates at 60 Hz, resolves to 0.01 mm as standard or 0.001 mm on the high-resolution option, works from -10 to +50 degrees C, and carries Wi-Fi, Bluetooth, USB, RS-232 and a removable microSD card. It spends its life on tank walls, pipework and ship hulls, and the faults that come with that are mechanical as much as electronic.
June Company’s certified technicians repair the 39DL PLUS for corrosion survey teams, refinery and pipeline inspectors, marine surveyors, and in-service inspection crews. We diagnose and repair at the board and component level, and every instrument is functionally verified against calibrated reference blocks before it ships back.
Common 39DL PLUS problems we fix
- Probe, connector and cable faults — intermittent or dead channels that trace back to worn connectors rather than the probe itself.
- THRU-COAT measurement faults — coated readings no longer separating coating from metal correctly.
- Pulser-receiver and gain faults — losing the backwall on attenuating material the gauge used to read reliably.
- Display and touchscreen failures — dim, dead or unresponsive panels, including digitizer faults that make the interface unusable in the field.
- Battery, charging and power faults — shortened runtime, or shutdowns partway through a shift.
- USB, Wi-Fi and Bluetooth communication faults — results not transferring to the host software, or the instrument not being recognized at all.
- Housing, seal and ruggedization damage — cracked enclosures and failed gaskets after a drop, which let dust and moisture inside the instrument.
- Calibration and velocity-table faults — the gauge not calibrating reliably against reference standards.
- Data logging and export faults — survey data not storing or not transferring to the reporting software.
- Keypad and interface wear — controls becoming unreliable after sustained field use.
FAQs
We are losing readings on heavily corroded surfaces. Is the gauge failing? Sometimes, and sometimes it is the transducer or couplant technique. We test the instrument against reference standards with a known-good probe to separate those.
THRU-COAT readings look wrong. Is that repairable? Usually yes. It normally traces to the pulser-receiver or the transducer rather than to anything fundamental.
Do you handle the 38DL PLUS and 45MG too? Yes, the whole corrosion gauge line comes through the same bench.
Every repair is backed by a 90-day parts-and-labor warranty, with a firm quote before any work begins. Email us or submit a service request.







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