Dynatest 1295 Pavement Friction Tester
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For further information please contact EquipmentSales@dynatest.com
The Dynatest 1295 Pavement Friction Tester (PFT) measures average locked wheel (skid) and peak incipient (slip) friction characteristics on paved surfaces.
The PFT is especially useful for maintenance testing to evaluate changes or deterioration in pavement friction due to aging weathering, high usage, or aging for pavement management.
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The 1295 consists of a fully instrumented tow vehicle and test trailer which uses the Dynatest two-axis force transducer to provide dynamic vertical load and horizontal tractive force measurements.
As a pavement measuring device, the 1295 meets all the requirements of ASTM-E274
"Specification For Skid Resistance Using A Full Scale Tire."
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1295 fully instrumented tow vehicle and test trailer
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Friction Tester Field Program |
All electronic instrumentation is solid state. User friendly, menu-driven Windows software allows the operator to enter and document multiple test parameters.
The field program calculates the dynamic Skid Number SN from the two-axis force transducer in real time, and displays the friction and speed traces for each test.
Test headers, skid numbers, as well as curves and peak incipient friction, can be printed and stored.
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Auto Calibration allows the operator to automatically calibrate the electronic measurement equipment with the two-axis force transducer.
The system's computer calculates the gain and the offset values for the force transducer and graphically displays the results.
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Real Time Dynamic Skid Curve |
From the "Auto Test" menu the operator can display all test results both graphically and numerically.
The computer automatically controls all phases of the friction testing cycle.
All test results can be displayed and saved to disk
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Transducer Output/System Diagnostics Menu |
Additional software capabilities include automatic system calibration, full system diagnostics, adjustable test cycle timing (within ASTM-E274 specifications), as well as the ability to exit the PFT program and use commercially available software.
Force Transducer
View bridge characteristics (forces, gains, offsets)
Activate bridge calibration circuitry (verify gains & offsets)
Tachometer
Distance counting (wheel encoder distance pulse counting)
Velocity measurement (timer latch counting
Brake system
Brake activation
Water system
Nozzle activation
Options
GPS, dual-side watering and texture laser
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The system is equipped with digital optical encoders to accurately measure distance and monitor test speed, a hand remote switch to initiate the automatic test, laptop PC and graphics printer.
Interior of Cab
The Maryland State Highway Administration 1295 Pavement Friction System.
Custom International Truck Chassis with utility body provides covered storage for air systems and spare tire storage.
The Maryland State Highway Administration 1295 Pavement Friction Test System. Delivered in 2005, equipped with a 1000 gallon (4000 liter) water tank.
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The two-wheel trailer is equipped with a parallelogram suspension, stabiliser bar and disc brakes.
An axle mounted force transducer provides direct measurement of the dynamic horizontal tractive friction force and the dynamic vertical load on the wheel.
A laminar flow nozzle (ASTM E274) is automatically raised and lowered for each test.
Utilises ASTM E501 or E524 smooth test tires.
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The Michigan Department of Transportation 1295 Friction Tester.
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