Dakota NDT FX81-DL Flaw Detector & Thickness Gauge

Fits demanding UT inspections that need the FX80-series advanced flaw detector plus thickness platform — tone-burst pulsers to 400 V, extra narrow receiver bands, DAC/AWS/TCG/DGS sizing, and multi-mode thickness including ThruPaint.

Key advantages

FX80-series class — Combined flaw detector and advanced thickness gauge with large internal memory
Pulser — Two tone-burst pulsers; 100–400 V; PRF 8 Hz–2 kHz; pulse width 40/80/400 ns
Receiver — Broadband 1.8–19 MHz plus narrow bands including 0.5 / 1 / 2 / 5 / 10 / 15 MHz on FX81-DL
Sizing — DAC, AWS, TCG, DGS; Z-Cross / Flank / Peak detection; TRIG angle-beam
Thickness — P-E / PECT / PETP / E-E / E-EV / CT modes; auto zero / recognition / temp compensation

Typical applications

Structural weld inspection to AWS D1.1 with automatic defect sizing aids
Thick or attenuative materials benefiting from higher pulser voltage
Coated corrosion surveys needing ThruPaint echo-echo plus flaw screening
Lab or field work needing sunlight-readable QVGA color display and IP65 case

Selection guide

FX81 vs FX80/FX71 — FX81 adds tone-burst to 400 V and extra narrow bands (0.5 / 15 MHz) vs lower FX handhelds
Physical — About 8.5 × 6.5 × 2.5 in (216 × 165 × 70 mm); ~4.5 lb (2.04 kg) with batteries — benchtop/handheld FX80 form, not the slim FX71 brick
Memory — 4 GB internal + up to 64 GB external; grid or sequential; screen capture
Environment — Operating −10 to 60 °C; IP65
Display views — Flaw: full wave / ±rectified / RF; Thickness: digits / ±rectified / RF / B-scan

Common mistakes

Expecting the slim FX71 handheld envelope — FX81 is the larger FX80-series chassis
Ordering without confirming tone-burst / 400 V need — FX71 may suffice for many weld jobs
Ignoring transducer damping/frequency band selection for the material
Leaving external SD / PC software needs blank when large archives are planned

When to RFQ / what to tell us

Confirm FX81-DL (vs FX71-DL) need: voltage, frequency bands, form factor
Flaw codes (AWS/DAC/DGS), thickness ThruPaint need, transducers, quantity
Ship-to and reporting software expectations

Request a Quote · Get selection help

Specs

Spec	Value
SKU	141430
Brand	Dakota NDT
Model	FX81-DL (FX80 Series)
Product type	Ultrasonic flaw detector + advanced thickness gauge
Display	Blanview QVGA TFT color 320×240; 60 Hz; ~5.7 in diagonal class
Pulser	Dual tone burst; 100–400 V; PRF 8–2000 Hz
Receiver bands	Broadband 1.8–19 MHz; narrow 0.5 / 1 / 2 / 5 / 10 / 15 MHz
Flaw toolkits	DAC, AWS, TCG, DGS; TRIG
Thickness modes	P-E, PECT, PETP, E-E, E-EV, CT (dual element)
P-E range (typical)	About 0.025 in–100 ft (0.63 mm–3048 cm), transducer-dependent
E-E ThruPaint	About 0.050–4.0 in (1.27–102 mm); coating-dependent
Memory	4 GB internal; up to 64 GB external
Case / IP	Extruded aluminum; IP65
Size / weight	8.5 × 6.5 × 2.5 in; ~4.5 lb with batteries
Operating temp	−10 to 60 °C (14–140 °F)
Power	Lithium-ion pack 10.8 V, 2 Ah class (OEM datasheet)

Documents

Dakota NDT FX81-DL datasheet (PDF)

FAQ

Q: How does FX81 differ from FX71? A: FX81 is the larger FX80-series unit with tone-burst pulsers to 400 V and additional narrow receiver bands; FX71 is the slim handheld dual-role gauge.

Q: Does it measure through coatings? A: Yes — Echo-Echo / E-EV ThruPaint and coating-only modes per FX80-series datasheet.

Q: What should I send for a quote? A: Confirm FX81 vs FX71, codes/probes, coating need, quantity, ship-to. Compatible with systems using Dakota FX81-DL — we do not claim authorized-dealer status.