Ultrasonic Flaw Detectors available from NDT International

Transflective Color TFT Display
Broad & Narrow Band Amplifier
Square Wave Pulser (Active Edge)
Extruded Aluminium Case (IP65)
Digital Thickness Display
DAC/TCG/AWS/DGS
Automatic Calibration

PC/Video/Analog Outputs
Long Battery Life (Li-ion pack)
Large Memory Capacity
Curved Surface Correction
Alphanumeric Notes
Trig function
Help feature

Specifications

Physical
Size:
9.25 x 7.13 x 4.0 in (235 x 181 x 102mm)

Weight:
7.5lbs. (3,4Kgs) with Li-Ion cells.

Case: Extruded Aluminum.

Display: Transflective TFT Color. Display area: 4.39” x 3.29” (111.4 x 83.5mm) 320 x 240 pixels. A-Scan area: 255 x 200 pixels (315 x 200 expanded), 8 color options and variable brightness.

Temperature:
Operating –10 to +55°C or 14 to 131°F
–20 to +70°C or –4 to 158°F
(survivable)
Storage –40 to +75°C or –40 to 167°F

Environmental:
Meets IP65 requirements.

Specifications

Units: English (inch),
Metric (mm), or Time (µs).

Probe Zero: 0–999.999 µs.

Velocity:
615 & 625 0.0393 to 0.3937 in/µs (1000–9999m/s).

635 & 638 0.0100 in/µs (256 to 16000 m/s.

Test Range:
615 & 625 0 - 0.2in (5mm) up to 0 - 400in (10,000mm) at steel velocity. Variable in sequence, 0.4in or 0.04in (10mm or 1mm).

635 & 638 0 - 0.05in (1mm) up to
0 - 800in (20,000mm) at steel velocity. Variable in 1, 2, 5 sequence or continuously in 0.05in (1mm) increments. Also from 1 to 5000(µs).

Test Modes: Pulse-echo and transmit/receive.

Gates:
615 & 625 Start & Width adjustable over full range. Amplitude 0 -100%, 0.5% steps. Visual & audible alarms. Single gate positive trigger, and two gates positive and negative triggering. Gate 2 has selectable 0.6 second delay on alarm.

635 & 638 Two fully independent gates with positive and negative triggering for each gate.

Gate Expansion:
635 & 638 Expands range to width of Gate 1.

Gate Monitor Delay:
635 & 638 Selectable 0.6 sec delay on gate 2 negative monitor.

Measurement Modes:

Signal Monitor - 635 & 638

Depth - Depth and amplitude of signal in gate.

Echo Echo - Echo-Echo distance, automatic gate 2 position.

Gate to Gate -
625: Echo-Echo distance , manual gate 2 position.

635 & 638 independent gates.

Trig - Trigonometric display of beam path, depth and surface distance. Calculation of skip depth and curve surface compensation, X-offset for transducer.

T-Min - Holds minimum thickness in depth mode.

System Linearity: Vertical = 1% Full Screen Height (FSH) Amplifier Accuracy ±0.1%dB. Horizontal ±0.4% Full Screen Width (FSW).

Pulser Voltage: 615 & 625 200 volt peak amplitude, rise/fall time < 10ns into 50ohm.

635 & 638 100V - 350V (450V 638 ) square wave pulser. Pulse width from spike to 2000ns duration - rise/fall times < 5ns into 50 ohms.

Pulser Width: 615 fixed at 100ns. 625 30-250ns linked to filter band.

635 & 638 Adjustable in 2% of nominal width, minimum 1ns maximum 40ns.

ActiveEdge: Unique active pulse control for enhanced near surface resolution and signal response. Replaces traditional damping control.

P.R.F.:
615 & 625 Selectable 35 to 1000Hz

635 & 638 5000Hz, 5Hz steps.

Screen Update Rate: 50 or 60Hz.

Rectification: Full wave, positive or negative half wave and unrectified RF.

Delay:
615 & 625 0 - 400 in (10,000mm)

635 & 638 0 - 800in (20,000mm) at steel velocity in 0.02 steps (0.05mm).

Gain: 0 to 110dB.
Adjustable in 0.5, 2, 6, 14 and 20dB steps.

Frequency Bands:
615: Broadband 1 - 10 MHz (-6dB).

625: 4 Narrow Bands centered at 1MHz, 2MHz, 5MHz, & broadband 1.5–15MHz.

635 & 638: 6 narrow bands centered at 0.5, 1, 2.25, 5, 10 & 15 MHz. Broad band at 2 to 22 MHz (-6dB) and 1 to 35 MHz (-20dB).

Vertical Linearity:
1% full screen height.

Amplifier Linearity: +/- 0.1 dB.

Horizontal Linearity:
+/- 0.4% full screen width (FSW).

Reject: LED warning when selected.
615 & 625 50% suppressive reject.

635 & 638 80% linear reject.

Memory
Thickness Logging: Storage for 8000 readings stored in Block - Location - Number coding or alpha-numeric pre-programmed work sheets. Transferable to Excel using optional PC software.

Panel Memory:
100 storage locations for calibration settings.

A-Scan Memory:
800 waveforms.

Features
Wave Smoothing: Produces a smooth signal envelope.

AGC: Automatic Gain Control sets selected echo to a user defined level (10 - 90%).

DAC: Up to 10 points may be entered and used to digitally draw a DAC curve. Reference -2, -6, -10, -12, -14 dB curves can be selected for JIS, ASME and EN1714 codes.

AWS: Automatic defect sizing in accordance with AWS D1.1 Structural Welding Code.

API: Automatic defect sizing in accordance with API 5UE.

AVG/DGS: Automatic defect sizing using probe data. 10 probe data sets can be stored.

TCG: 625, 635 & 638 Time corrected gain. 40 dB dynamic range, 30 dB per microsecond, up to 10 points for curve definition.

Auto-Cal: Provides Automatic calibration with two echoes.

Reference Waveform: Recalled waveform can be shown in a different color to live waveform for direct comparision.

Display Freeze: Hold current waveform on screen.

Peak Memory: For echodynamic pattern determination.

Online Help: Instant operator guidance on operation accessed from direct key.

Language Support: Six user selectable languages from: English, German, French, Spanish, Dutch, Italian, Russian, Polish, Czech, Finnish & Hungarian. Others available on request.

Power Source

Battery: Lithium Ion battery pack 14.4V, 5.0 Amp hrs. Minimum 11 hours use, typical 15 hours, indication of battery charge. Recharge time 4 hours.

Charger: 100 - 240 VAC,
50 - 60Hz.

Connections

USB: For connection to PC, keyboard and printer.

Outputs: Serial Interface, composite video (NTSC & PAL), analog output for amplitude and distance updated at PRF rate. Transmitter sync output.

Transducer Connectors: available with BNC or LEMO 1 connectors (factory option).

Additional 638 Features

Interface trigger: Interface gate locks to surface echo and eliminates water path variation.

High Power Pulser:
450 volt boost.

Warranty: 2 year limited