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- [ LTL2000 Retrometer ]
- [ QD30 Reflectometer ]

On site quality control of road markings & road surfaces in agreement with CEN specifications

• Plane & profiles markings
• Dry & wet surfaces
• Measurements is full daylight
• Stray light compensation
• Measurement geometry corresponding to realistic viewing conditions in night time traffic in agreement with the prEN 1436 "Horizontal Signalization" draft standard
• Portable, self-contained instrument with reflection standard for on site calibration
• Direct digital read-out of the coefficient of retroreflected luminance, R_L
• Built-in printer
• Data storage in internal non-volatile memory
• RS232 serial inteface for data output, extended control, calibration and diagnostics.
• Carrying case, including calibration standard

The LTL2000 Retrometer is a self-contained, portable instrument with built-in facilities, capable to measure accurately and reliably retroreflection properties of road surfaces and road markings (dry and wet) including those with profiled and/or textured surfaces.

The LTL2000 Retrometer measures the retroreflection (with direct read-out of the coefficient of retroreflected luminance in mcd-m^-2-lx^-1) at a simulated distance of 30 m, a distance large enough to be relevant for practical driving conditions at night. Built-in printer and non-volatile memory provide registration of measurement results and corresponding supplementary data.

Serial interface RS232 is included for extented control, calibration, and data output.

The LTL2000 Retrometer is powered by a rechargeable battery with a capacity corresponding to approx. 1000 measurements. A mains powered battery charger is supplied as a standard accessory.

LTL2000 Retrometer Specifications (Specifications in aggreement with prEN 1436 draft:)

• Field of measurement
  Width: 45mm
  Min. length: 200mm
• Illumination angle to the road: 1.24°
• Observation angle to the road: 2.29°
• Illumination angular spread
  horizontal: 0.33°
  vertical: 0.17°
• Observation angular spread: ±0.17°
• Equivalent observation distance: 30 m
• Min. reading (mcd-m^-2lx^-1): 0
• Max. reading (mcd-m^-2lx^-1): 2000
• Instrument dimensions:
  Max length: 72 cm
  Max. width: 21 cm
  Max height: 47 cm
  Weight: 12 kg
• Gross weight: 22 kg
• Power supply: internal 12V, 3.5Ah sealed lead-acid battery external charger
• Memory capacity: min. 1000 measurements
• Serial communication: 9600, N, 8, 1
  Interface: RS232

Technical References

• LTL800 Function Test, Sven-Olof Lundkvist, VTI. VTI note No. TF 55-07, Statens Väg og Trafikinstitut, Swenden, 1987.
• Optical methods for the Measurement of Road Markings, Road Signs and Roads Surfaces, Kai SØrensen, LTL. Reprint of a paper presented at an CIE/MEE symposium 1986.
• These and other papers on the LTL2000 Retrometer and instruction manual may be obtained from DELTA Light & Optics or your distributor together with further user references.

Standard Delivery

• LTL2000
• Carrying case
• Base frame
• Reflection standard - calibrated
• Working reflection standard
• Battery charger

Options

• Calibration certificate
• Calibration service

Selected References

• The Danish Road Research Laboratory - (DK)
• The Association of Road marking Manufacturers - (DK)
• Superfos Construction A/S - (DK, USA)
• Dundesanstalt für Straßenwesen - (D)
• Deutsche Studiengesellschaft für Straßenmarkierungen - (D)
• Ministry of Transport - (ES)
• Belgian Road Reasearch Center - (B)
• Prismo Ltd. - (UK)
• The Road & Traffic Reasearch Institute - (S)
• The Swedish Directorate of Roads - (S)
• The Norwegian Directorate of Roads - (N)
• Technical Research Centre (SF)
• Potters-Ballotini Ltd. - (GB)
• Transport and Road Reasearch Lab. - (GB)
• 3M cmpany - (USA)
• Motor Directorate - (CZ)