Surface Systems & Instruments, Inc.

CS8800 Walking Profiler

Collect highly accurate road profiles for ride quality and roughness reporting.

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At a Glance

Collect highly accurate road profiles for ride quality and roughness reporting under agency specifications pavement smoothness testing.  The CS8800 can also generate reliable reference profiles for accuracy comparisons with inertial profilers for equipment certifications. With optional 3D texture and land surveying instrumentation, the CS8800 delivers a highly versatile, productive solution.

 

Collect Data at Continuous Walking Speed

The CS8800 collects data continuously without stopping the device to record static measurements. Walking speed collections are the norm on regular textured surfaces. The one inch (25.4mm) sampled continuous profiles support outputs far beyond ride indexes, including extensive analysis profile feature and waveband analysis.

 

Easy to Store & Ship

With a lightweight, compact design and a collapsible handle, the CS8800 ships and stores in a reusable rugged container. Easily transported and ready for use in minutes.


Report IRI & Localized Roughness

The CS8800 has been proven to generate the same results as inertial profilers and the California profilographs. This has been proven by agency certifications and independent research concluding that the CS8800 and inertial profilers generate equivalent profiles, ride quality index results (IRI, PRI, etc.), and areas of localized roughness. The same is true for comparing the CS8800 to the California profilograph--the devices generate equivalent Profile Index and must grind bumps.

 

Texture Option

Using a wide beam Gocator 5KHz laser from LMI Technologies, the CS8800 is equipped to measure pavement texture. Conventional reporting of Mean Profile Depth (MPD) is supported under such standards as ASTM E-1845 (Standard Practice for Calculating Pavement Macrotexture Mean Profile Depth). 3D laser measurements of the pavement surface are available for viewing and advanced texture analysis. 


Land Surveying Options

The CS8800 can be paired with either RTK corrected GPS or Total Stations instruments. The result is highly accurate one inch sampled surface profile that adds the Z dimension from survey elevations. The data can be converted for use in applications calling for survey formats, such as PNEZD, PLLHD and GPGGA. 

 

Specifications & Features

The CS8800 has evolved from over fifteen years of hardware, electronics and software engineering. The result is a full featured, refined device that performs at the highest level in its class. 

 

Hardware Features

  • Proven 99% repeatable data on multiple same surface test runs.
  • ASTM 2133 compliant device.
  • Sampling Interval: 1”/25.4 mm default (equivalent to ASTM E950 Class I equivalent profiling device).  Adjustable (.25”-6”; 6.35 -150 mm). 
  • Guaranteed compliance with agency specifications and test methods.
  • Modular, portable design:  all core electronic and sensor components smaller than Toughbook operator interface computer. 
  • Core components field installable and can ship express. 
  • Current model Panasonic Toughbook 19 military specification notebook computer with daylight readable Touchscreen controls. 
  • Professionally engineered, self-balancing frame.
  • Assembles in minutes (by attaching handle and computer).
  • Entire system fits in reusable container for storage and shipping.
  • Multiple sensor inputs (encoders/inclinometers) processed with SSI proprietary collection electronics and filtering methods for best profile. 
  • Bi-directional collection and reporting of multiple profile traces on a single report (patented technique for transverse surface evaluation).
  • Extended capacity battery for full day (>10 hours) of testing.
  • Buy or Rent.
  • On-site customer training and support worldwide.
  • GPS subsystem with embedded receiver accuracy options available in three configurations: (1) Low (2-3 meter); (2) Medium (0.7 meter); or (3) High (2-5 cm, with subscription or RTK).
  • Survey option (merges CS8800 with corrected GPS or total stations).
  • Texture measurement option with lateral scanning laser.

 

Software Features

  • Reports IRI, MRI, HRI, PRI, RN, and Localized Roughness (with adjustable bump and dip templates). • Floor Flatness/Levelness.
  • Instant test results and viewing of profile traces and reports.
  • Outputs longitudinal profile, elevation data, slope, simulated profilograph, raw strip trace, ERD/PPF (for ProVal), and PRO formats.
  • Multiple trace reporting allows cross-surface analysis of parallel profile traces (patented by SSI).
  • Append data to existing files for comparison of original surface condition with corrected surface.
  • On-Screen user’s manual and instructions for software operation.
  • Profile reports and traces available on-screen, in PDF images, Excel (templates supplied), hard copy print out, or electronic formats. 
  • Colorized traces and highlights of bonus/penalty profile areas. 
  • Encrypted raw data for infinite reanalysis with variable parameters
  • Software updates by self-executing internet download.
  • Real time diagnostics monitor system health and ease support.
  • Data infinitely rewritable with variable analysis parameters (English or Metric units, profile indexes, data filters, localized roughness).
  • Desktop license supplied for viewing, analyzing, printing and emailing of CS8800 data using SSI Profiler software.
  • On-site customer training and support worldwide.
  • GPS subsystem supports real-time position display, correlation of GPS with project stationing/chainage, GPS Tracker for trace navigation, Google Earth and GIS exports.
  • Survey option (merges CS8800 with corrected GPS or total stations).
  • Texture measurement option with lateral scanning laser.

Proof of Performance

The CS8800 has evolved from over fifteen years of hardware, electronics and software engineering. The result is a full featured, refined device that performs at the highest level in its class. 
CS8800 Proof of Performance Download (PDF)

Technical Specifications

  • Device Classification/Rating: ASTM 2133 (and ASTM E950 Class I device equivalent). World Bank Standard—Class 1 profiling device.

  • Test Results and Data Outputs: IRI, MRI, HRI, PRI, RN, CA Bridge, Variable localized roughness templates.  PDF, Excel, ERD/PPF and raw strip trace formats.  Floor Flatness/Floor Levelness.

  • Localized Roughness: Dimensions of bumps/dips measured with maximum amplitude of peaks and troughs calculated.  Variable template for measuring defects with straightedge, profilograph, or relative profile methods

  • Measuring Units: English/Metric (variable, re-writeable).

  • Operating Speed: 0.0– 3.0 mph (0-5 kph) (slower speed required for best results on rougher or coarse surfaces.)

  • Sampling Interval: Default = 1 inch (25.4 mm).  Alternate sampling intervals configurable.

  • Profile Accuracy: ±0.381 mm (±0.015 inch) per 45.7 meters (50 yards).

  • Height Measurement Precision: ±0.0025mm (±0001 inch) per: (I) 305 mm (12 inch) wheelbase, or (2) 250mm (10 inch) wheelbase.
  • Grade Measurement Resolution: 1 in 4.7 or 12 degrees.
  • Longitudinal (Distance) Resolution: +/- .025%.

  • Power Supply: Main system battery: extended capacity 12V Lithium Ion battery. Notebook PC runs on CS8800 main battery or separately on internal battery. Estimated battery life designed to 12-16 hours.

  • Weight: ~40 lb/18 kg (without Toughbook computer, battery, accessories or carrying case).

  • Dimensions: 34.5” (L) x 18.0” (W) x 12.125” (H) [collapsed, 36.5” with handle extended).

  • Environmental: Operating Temperature: 15 -140°F (-10 to 60°C).  Storage: -50-170°F (-30-75⁰C).

  • Data Collection Electronics: SSI proprietary embedded microprocessor based electronics architecture (ISO 9001 fabricated). 

  • Operator Computer: Panasonic Toughbook 20 military specification notebook PC with touchscreen controls.

  • Operating System: MS Windows 7 Professional operating system. SSI built Windows software for calibration, data collection and feature rich data analysis/reporting.

  • Data Storage: Typical notebook hard drive (160-320GB) stores >200000 miles (320000 km) of profile data. Raw data files are transferable through portable storage media or email attachment.

  • Data Format: SSI proprietary encrypted format.  Export routines (supplied) for ERD/PPF (for ProVal), PDF or Excel.

  • Options: GPS integrated with profile data. Survey subsystem (RTK GPS or total stations). Texture laser.

*Specifications subject to change without notice.

 

Performance

The SSI CS8800 Walking Profiler system has the proven ability to generate highly accurate and closely repeatable surface profile data. The graphs below were generated based on comparison of CS8800 walking profile data consisting of repeat data collections from the same surface. The images below report results from six same surface data collections(1) along a 541 foot (165 meter)  concrete surface. (2)  Four categories of performance are presented: (1) Proof of Accuracy, (2) Proof of Repeatability, (3) Cross-Correlation of CS8800 Data, and (4) IRI Test Result Comparisons.  

 

1. Proof of Accuracy.  Figures 1 and 2 below show a comparison of same surface data from the CS8800 compared to independent survey data.  The accuracy comparison shown in Figure 1 depicts an excellent point-to-point comparison between the various individual collections, with no absolute difference greater than 34 mils.  Figure 2 shows a close up comparison of CS8800 data (the blue trace) overlaid on the reference survey profile with exact precision.  On a running point-by-point comparison, the accumulated difference between the CS8800 system’s profile and the survey profile is 23.8 mils (0.0238 inches).  This degree of accuracy exceeds the requirements of the most stringent DOT certification requirements. Prior to delivering any CS8800 profiling system to an end user, SSI’s verifies that the collection system compares against an independent reference profile with an equal or greater degree of accuracy than is required by agency specifications or equipment certification requirements.

 

Figure 1: SSI CS8800 Profiling System Accuracy Results

 

Figure 2: SSI CS8800 Profiling System - Proof of Accuracy vs. Survey Data

 

2. Proof of Repeatability:  SSI’s CS8800 Walking Profiler system is proven to also generate highly repeatable profile data.  A repeatability comparison between the six same surface CS8800 runs is shown in Figure 3.  There is excellent point-to-point repeatability between the various individual collections, with a repeatability statistic of 99% 

 

Figure 3: SSI CS8800 Profiling System - Repeatability of Same Surface Collections

 

3. Cross-Correlation of CS8800 Data. An increasingly popular method of comparing same surface data from profiling devices is to compute a cross-correlation score rating the agreement between the multiple profiles. The CS8800 has demonstrated the ability for very high cross-correlation scores. Waveband correlation between six same surface data collections is shown in the table below in Figure 4. For purposes of this analysis, the wavebands of interest are: (1) IRI waveband; (2) Long (25-125 feet); (3) Medium (5-25 feet); and (4) Short (1-5 feet). 

 

Figure 4: SSI CS8800 Profiling System - Cross-Correlation of Same Surface Data

 

The waveband correlation is 99% or higher in all wavebands except the short waveband, which achieved 93%.

4. Comparison of Same Surface Ride Statistics. Figure 5 shows the IRI (International Roughness Index) values for six same surface data collections with the CS8800. The IRI values are tightly clustered, with no run differing from another by more than 1.6 inches/mile on an SSI proving ground surface with a roughness content of about 215 inches per mile (3400 mm/km).

 

Figure 5: SSI CS8800 Profiling System - Cross-Correlation of Same Surface Data

 

Notes:

1Runs 4-6 were collected one day later and with a separate CS8800 device than was used to collect Runs 1-3.

2Analyses generated using a maximum 5 inch (127 mm) shift profile offset shift and 200 foot (61 m) Moving Average High Pass Filter.

3The performance of the CS8800 and other surface profiling devices is affected by variables such as device tracking, operating speed and the magnitude of roughness and texture attributes on the test surface. 

  

 

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At a Glance

Collect highly accurate road profiles for ride quality and roughness reporting under agency specifications pavement smoothness testing.  The CS8800 can also generate reliable reference profiles for accuracy comparisons with inertial profilers for equipment certifications. With optional 3D texture and land surveying instrumentation, the CS8800 delivers a highly versatile, productive solution.

 

Collect Data at Continuous Walking Speed

The CS8800 collects data continuously without stopping the device to record static measurements. Walking speed collections are the norm on regular textured surfaces. The one inch (25.4mm) sampled continuous profiles support outputs far beyond ride indexes, including extensive analysis profile feature and waveband analysis.

 

Easy to Store & Ship

With a lightweight, compact design and a collapsible handle, the CS8800 ships and stores in a reusable rugged container. Easily transported and ready for use in minutes.


Report IRI & Localized Roughness

The CS8800 has been proven to generate the same results as inertial profilers and the California profilographs. This has been proven by agency certifications and independent research concluding that the CS8800 and inertial profilers generate equivalent profiles, ride quality index results (IRI, PRI, etc.), and areas of localized roughness. The same is true for comparing the CS8800 to the California profilograph--the devices generate equivalent Profile Index and must grind bumps.

 

Texture Option

Using a wide beam Gocator 5KHz laser from LMI Technologies, the CS8800 is equipped to measure pavement texture. Conventional reporting of Mean Profile Depth (MPD) is supported under such standards as ASTM E-1845 (Standard Practice for Calculating Pavement Macrotexture Mean Profile Depth). 3D laser measurements of the pavement surface are available for viewing and advanced texture analysis. 


Land Surveying Options

The CS8800 can be paired with either RTK corrected GPS or Total Stations instruments. The result is highly accurate one inch sampled surface profile that adds the Z dimension from survey elevations. The data can be converted for use in applications calling for survey formats, such as PNEZD, PLLHD and GPGGA.