FDIMR-L BT Back-to-back distance measuring gauge

Designed for direct measurement on rolling stock without removing the wheelset. Bluetooth-enabled gauge for accurate back-to-back distance measurement of railway, metro and tram wheels.

Key features

Measurement range: 1360 to 1440 mm or on request (nominal distance ± 15mm)
Measurement error: ±0,2 mm
Indication discreteness: 0.1mm, 0.01mm or 0.01inch
Display: Build-in, LED
Operating temperature: -15°С to +50°С
Weight: 850g
Dimensions: 234,2mm x 87,7mm x 32mm

About the FDIMR-L BT Back-to-Back Gauge

The FDIMR-L-BT back-to-back distance measuring gauge is designed for accurate inspection of railway, metro and tram wheelsets. It measures the back-to-back distance directly on rolling stock during check-up, examination, repair and wheelset formation.

The measurement method is based on direct distance measurement with an integrated laser triangulation sensor. With a measurement range of 1340–1610 mm, or custom ranges on request, and a measurement error of ±0.2 mm, the gauge supports reliable wheelset inspection in railway maintenance environments.

Usage conditions

The gauge is placed on the inner surface of the wheel using a magnetic support. Measurements can be performed directly on the rolling stock without rolling out the wheelset. The system supports single measurements and measurements with averaging to reduce the influence of surface defects.

The manual mentions PDA operation, but for Althen this is replaced by Bluetooth connection to smart devices for digital measurement workflows.

Possible applications

Back-to-back distance measurement of railway wheels
Metro and tram wheelset inspection
Wheelset formation and repair
Rolling stock maintenance
Tolerance verification
Preventive maintenance workflows

Advantages of choosing this product

The FDIMR-L-BT enables fast and structured measurement of back-to-back wheel distance directly on the vehicle. Its Bluetooth connectivity supports digital data transfer to smart devices, while the built-in LED display allows direct readout at the gauge.

The averaging function allows multiple measurements to be combined, helping reduce the influence of wheel surface defects and improving measurement reliability.

Other important features

Built-in LED display
Magnetic support for stable positioning
Measurement at 1, 3 or 6 points
Tolerance control with visual warning
Metric and inch display modes
Automatic display rotation
Rechargeable battery operation
Optional calibration tools

Do you need this sensor for your next project?

Request a no-obligation quote or send us your contact details for a free, no-obligation consultation. Our sales engineers will then contact you within a maximum of 1 to 2 working days.

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Product downloads

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Not exactly what you are looking for? We offer standard sensors, but can also help you with sensors adapted for you or a fully customised measurement solution. Contact us for advice or pricing.