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Railscan 125+

For more than 30 years the Railscan name has meant exceptional performance with class-leading design within the rail infrastructure market.

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Railscan 125+


Setting standards of performance and reliability


The new Sonatest RailScan 125+ flaw detector delivers a higher level of nearsurface resolution and penetrating power into a portable and rugged enclosure. It also offers more measuring capabilities than its predecessors for rail applications such as:

  • rail walking stick inspection solutions
  • rail manual defect sizing
  • rail bottom depth measurements


Sonatest Ultrasonic Assurance of Quality

Based on 60 years of experience, the Railscan 125+ is powered by high-end software and electronic technologies:

  • Narrow Band amplifiers 2 MHz & 5 MHz
  • Up to 3 gates for complete inspection solutions
  • Encoder driven for Rail-Thickness auto-logging
  • Best signal-to-noise ratio on the market (SNR)

The Reference for Railway Companies

Approved by Network Rail, the owner and infrastructure manager of most of the rail newtwork in England, Scotland and Wales, the Railscan 125+ takes part in the quality control procedures to ensure integrity assessment of the UK railway network.

High Visibility Display

For any flaw detector, the display is a crucial element. The Railscan 125+ has a colour transflective VGA display and maximum readability is achieved, even in direct sunlight conditions, through adjustable brightness and the choice of 9 colour palettes, including a black-on-white LCD emulation mode. The Full-Screen mode maximises the A-scan area to improve readability further whilst testing and its fast response and peak capture functionality ensure any indications clearly displayed, even if it only appears for one cycle of the 1 KHz PRF.

High Performance with Total Control 

The acknowledged ease of use of the previous Railscan generation has been enhanced with the menu navigation key, providing easy access to functions. The menu structure has been designed to guide the user through their task with operation quickly becoming second nature.

Robust & Reliable

Sonatest’s reputation for robust design and proven reliability is an important aspect of our flaw detector ownership. Downtime is expensive and should be minimised to ensure maximum productivity. The Railscan 125+ is constructed to high standards using a highdensity enclosure that is sealed to IP67, giving an excellent water resistance so it can withstand the railways’ harsh environments in which operators work. The Railscan 125+ comes with a 2 year warranty, extendable to 5 years with Sonacover, and a worldwide service network.

UT-Lity Data Management Software

UT-Lity software provides everything you need to manage your inspection data, configuration files and software updates.

  • Load, store, manage files both on the PC and on a connected flaw detector
  • Save, analyse, colour code and export thickness logging data to spreadsheets/asset management software
  • Update the Flaw Detector Firmware as and when updates become available on Sonatest website

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Test Range5mm (0.2in) up to 15,000 mm(590 in.) in steel at 5930m/s (19455f/s)
Velocity10,000 - 9999 m/s continuously variable.
Probe0 to 150 μs
Delay0-10,000m (394in) in steel at 5930m/s
Gain0 to 110dB adjustable in 0.5, 1, 2, 6,14 and 20dB steps
Test ModesPulse echo and transmit/receive. Single Crystal and Double Crystal.
Damping400 Ohm damping fixed
Pulser200V. Pulse Width 100ns fixed
P.R.F.1000Hz fixed
Screen Update Rate60Hz
RectificationFull wave fixed
Frequency Range2 selectable filter bands. i. 2 MHz (1.4MHz - 3MHz) ii. 5 MHz (3MHz - 8MHz
System LinearityVertical = 0.5% Full Screen Height (FSH). Horizontal +-0.2% Trace Full Screen Width (FSW).
UnitsMetric (mm), inch (in)
DisplayColour Transflective VGA (640 x 480) TFT
Display area116.16 x 87.2 mm (4.57 x 3.43 in)
A-Scan Area400 x 510 pixels (normal), 460 x 620 (FS)
Colours9 colour options with variable brightness
Gate MonitorThree independent gates for measurement and monitoring. Start and width fully adjustable over the entire range of theinstrument. Levels adjustable from 0% to 100%: Gate 1 positive triggering and Expand. Gate 2 negative triggering with 0.6s delay and expand. Gate 3 Positive and negative triggering and expand. With different audible & visual alarms for each gate. Gate resolution is 5nS.
Gate Delay0.6 Second Negative delay on Gate 2
ZoomExpands range and delay to cover the area set by Gate 1 start & width controls
AGCAutomatic Gain Control automatically sets the signal in Gate 1 to a level between 10% and 90% FSH, tolerance between 5% and 20%
Measurement Nodes
Mode 1Signal monitor, Gate alarms can be active but no measurements are displayed
Mode 2Depth and amplitude of first signal in gate
Mode 3Trigonometric display of beam-path, surface distance (including X-offset) and depth of indication from the inspection surface together with echo amplitude. Curved surface correction can be applied for convex and concave surfaces. Half-skip can be indicated on screen.
Mode 4Gate to Gate distance measurement
Measurement DisplayLive display and updates on screen at 3 times per second. Large display of a single measurement available.
ContourAuto fixed
Waveform SmoothingSelect from: i) None (both min and max values are displayed in the A-Scan) ii) Fill (Min values set to baseline value, produces a solid A-Scan) iii)Smooth (min values ignored, produces a clear outline A-Scan)
PersistenceCauses previous A-scans to “fade out” at a user-determined rate
Auto-CalProvides automatic calculation of velocity and probe zero from 2 reference echoes
ClockBuilt in, battery-backed RTC keeps time and date. Visible on the status line, always stored with Panels, A-logs etc.
Internal Memory4GByte storage available for A-scans, panels, T-logs, B-logs etc. 450,000 Panels, 200,000 A-Logs, 300,000 B-Charts, 440,000 T-Logs
Active Peak MemoryRetains all A-scans on screen for echo-dynamic pattern analysis, with the active A-scan displayed in a separate colour
NotesAlphanumeric labelling for panel stores, A-logs, B-logs etc
Help KeyShows software and hardware information
Language SupportEnglish only available on Standard version Spec 1 and Spec 2 support multiple languages are selectable from a list including: English, Romanian, French, Spanish, Russian, Chinese (Modern). Others are available on request.
Encoder ConnectionD-Sub 15 connector (700M)
Encoded Thickness Logging5mm pulse logging
Video and BuzzerVideo 6 pin lemo connector at front
USB ConnectionInternal storage shown as Memory Device
Transducer SocketsBNC only
PowerLithium Ion 14.4V battery pack. Typically 13.5 hours. Indication of battery charge status. Recharge time 3-4 hrs. Battery can be charged separately. Mains pack optional.
Charger100-240 VAC, 50-60Hz.
EnvironmentalDesigned to meet IP67
TemperatureOperating -10oC to 55oC (14oF - 131oF). Survivable -20oC to 70oC (-4oF -158oF).Storage -40oC to 75oC (-40oF - 167oF).
SizeH145mm x W255mm x D145mm (5.7in x 10 in x 5.7in)
Weight2.5kg (5.5lbs) with battery
Warranty2 year
Extended WarrantySonacover - extended 5 year warranty, including 4 calibrations.
Calibration StandardISO 22232-1:2020 (Detailed Specification available on request)
StandardsVibration to 514.5-5 Proc 1 Annex C Fig 6 Shock 516.5 Proc 1 15g/6ms Explosive atmospheres - MIL-STD 810G Method 511.5 Procedure I

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Standard Kit

Product CodeDescription
RS125+RS125+ Digital Flaw Detector BNC
Battery, Charger, Charger mains cable
User Guide
Calibration Certificate
Carry Bag
USB cable

Accessories & Spares

Product CodeDescription
800208Battery Charger
242174Battery Pack
195154DFD Storm Case
145324Screen Cover
195121Replacement Bag
165027RCA Video Output Cable
165028USB Type A Male Cable Assy
152120Cable DFD to PC
MPS-701EUFlaw Detector Mains Pack
MPS-701UKFlaw Detector Mains Pack
MPS-701USFlaw Detector Mains Pack
196170Sacci Body Hook Harness
136168BNC to BNC 50 Ohm
136169BNC Female to Lemo Male
136171Lemo (M) to Lemo 00( F)
152018BNC (M) to LEMO (F) Adaptor

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Brochure & Specification

Type Title Date Size
PDF file icon Railscan 125+ Specification.pdf 08/23 Download 0.11 MB
PDF file icon Railscan 125+.pdf 08/23 Download 1.08 MB

Li-Ion Battery Information

Software Updates

UTLity Software UpdatesJuly 2016v1.4.1018MDownload

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