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DLS VERIFICATION TESTING
FIELD TESTS
TO
CHECK DLS OPERATIONS
DATA LOGGER SYSTEMSDATA LOGGER SYSTEMS • Data LOGGER SYSTEMS (DLS) ARE ELECTRONIC SYSTEMS USED TO:
1. MONITOR MATERIAL APPLICATION CONDITIONS
i.e. ambient temperatures
2. PROVIDE REAL‐TIME DATA OF ACTUAL APPLICATION PARAMETERS
i.e. pounds of glass beads put down
3. ALLOWS STRIPERS TO MAINTAIN APPLICATION
RATES
STRIPING TRUCK WITH DLS SYSTEMSTRIPING TRUCK WITH DLS SYSTEM
ELECTRONIC CONTROL BOX
OHIO DOT DLS INFORMATIONOHIO DOT DLS INFORMATION
THE OHIO DOT DLS TECHNICAL GUIDE CAN BE FOUND AT:
O:\TRAFFIC\Markings Summits\Markings Summit 2007\Markings Summit Districts
THE OHIO DOT DLS TECHNICAL GUIDE CONTAINS INFORMATION
THAT INCLUDES:THAT INCLUDES:
1. EXAMPLES OF DLS DATA REPORT FORMS
2. HOW DATA IS ENTERED INTO A DLS REPORT
3. HOW TO READ A DLS REPORT
4. DLS REPORT SECURITY
SENSORS
SENSORS SUCH AS TEMPERATURE SENSORS, LOCATED ATAPPROPRIATE LOCATIONS ON THE STRIPING TRUCK, PROVIDETEMPERATURE DATA.
GAUGES
GAUGES PROVIDE DATA AND HELP MONITOR THE TEMPERATURE OF STRIPING MATERIAL IN THE TANKS.
GLASS BEAD TANK LOAD CELLS
GLASS BEAD TANKS ARE MOUNTED ON LOAD CELLS. LOAD CELLSGLASS BEAD TANKS ARE MOUNTED ON LOAD CELLS. LOAD CELLS ARE THE BASIS OF BEAD WEIGHT CALCULATIONS.
DLS ELECTRONIC DATA SHEET1. DLS DATA IS AUTOMATICALLYRECORDED AND STOREDRECORDED AND STORED ELECTRONICALLY
2. DLS DATA INCLUDES:2. DLS DATA INCLUDES:
*SENSOR DATA
*DISTANCE DATA
*AMBIENT CONDITIONSAMBIENT CONDITIONS
*MATERIAL QUANTITIES
3 VERIFICATION TEST3. VERIFICATION TEST RESULTS WILL BE COMPARED TO CONTRACTORS ELECTRONIC SHEET DATA
FIELD CHECKING A DLS SYSTEMCalibration Sticker Check
1. CHECK FOR THE PRESENCE OF:
THE ANNUAL CALIBRATION STICKER
CALIBRATION STICKEREVIDENCE OF ANNUAL CALIBRATION SHALL BE A SIGNED ANDEVIDENCE OF ANNUAL CALIBRATION SHALL BE A SIGNED AND
AFFIXED TO THE INSIDE OF THE DRIVER’S DOOR OF EACH
STRIPING TRUCKSTRIPING TRUCK.
YEARLY CALIBRATIONYEARLY CALIBRATION
1. ACCORDING TO THE OHIO DOT CONSTRUCTION AND
MATERIAL SPECIFICATION MANUAL, ITEM 641, SECTION
641.03, EACH DLS SHALL HAVE AN ANNUAL CALABRATION.
2. ITEMS TO BE CALIBRATED INCLUDE:
‐ALL MECHANICAL AND ELECTRICAL COMPONENTS
‐SOFTWARE
FUNCTION AND OUTPUT‐FUNCTION AND OUTPUT
3. CALIBRATIONWILL BE CONFIRMED BY MANUFACTURER.3. CALIBRATION WILL BE CONFIRMED BY MANUFACTURER.
Field Checking a DLS SystemThe Plate TestThe Plate Test
1. Place an aluminum plate around 24 in. x 8 in. under the paint gun of the striping truckpaint gun of the striping truck. Aluminum plates are supplied through the Office of Materials Management (OMM), Chemical SectionSection.
2. Allow the striping truck to stripe over the plate in order to get a stripe of the desired thickness
th l ton the plate.
3. Send the striped plate to the OMM , Chemical Section for film thickness testing.
4. Send the contractors’ DLS average mils applied data as comparison for the film thickness testing results.
Note: Be careful not to damage the
paint stripe on the plate.
Field Checking a DLS SystemThe Plate TestThe Plate Test
Field Checking a DLS SystemThe Bead Weight TestThe Bead Weight Test
1. Check and record the bead weight on the DLS electronic data sheet W1.
2. Obtain an object of known weight, minimum of twenty (20) pounds, i.e. a fifty pound bag of glass beads.
3. Place the weight on top of the
bead tank. Keep the weight in position on top of the tank and check and record the new weight W2, on the DLS electronic data sheetsheet.
4. Subtract W1 from W2 to get the known weight of the object used.
W2 – W1 = weight of the object of known weight usedknown weight used.
Correct test results confirms the
proper operation of the bead tank
load cells as well as the accuracy ofload cells as well as the accuracy of
the data on the spreadsheet.
Field Checking a DLS SystemTh B d W i h TThe Bead Weight Test
Field Checking a DLS SystemThe Infrared Thermometer Test
1. Use a hand‐held Infrared Thermometer to measure road surface temperature, ambient temperature, and/or striping material temperature.
2. To operate the infrared thermometer, follow the manufacturer’s operating proceduresprocedures.
3. Compare temperature readings to the data on the appropriate DLS electronic screen.
4. Temperature readings on the DLS screen should be within +/‐/5% of the thermometer readings.
Field Checking a DLS SystemTh I f d Th TThe Infrared Thermometer Test
Field Checking a DLS SystemThe Humidity Test
1. Measure the ambient humidity with the use of a Sling Hydrometer.
2. To operate the sling hydrometer follow thehydrometer, follow the manufacturer’s operating procedures.
3. Compare humidity readings to the data on the appropriate DLS electronic screen.
4. Humidity readings on the DLS screen should be within +/‐5% of the hydrometer yreadings.
Field Checking a DLS SystemThe Humidity Test
Field Checking a DLS SystemThe Distance Traveled Test
1. Testing the Distance Traveled d h DLS El i Ddata on the DLS Electronic Data Screen can be done using a distance wheel like the one shown in the picture.
2. To operate the distance wheel, follow the manufacturer’s operating procedures.
3. Compare distance readings to p gthe data on the appropriate DLS electronic screen.
4. Distance readings on the DLS screen should be within +/‐ 5%screen should be within +/ 5% of the distance wheel readings.
5. DLS distance data can also be checked using mile markers and an odometeran odometer.
Field Checking a DLS SystemThe Distance Traveled Test
SUMMARYSUMMARY• THE SPECIFIED ANNUAL CALIBRATION OF DATA LOGGER SYSTEMS (DLS) IS THE
PRIMARY CHECK OF THE OPERATION OF THE SYSTEMS.
• THE TESTS DESCRIBED IN THIS PRESENTATION ARE MEANT TO BE DONE IN A RANDOM FASHION TO:
1. VERIFY PROPER OPERATION AFTER CALIBRATION
2. DETERMINE IF THE SYSTEM IS THE CAUSE OF SUSPICIOUS
DEVELOPMENTS IN THE FIELD APPLICATION OF STRIPING MATERIAL
• ONE OR ALL OF THE TESTS MAY BE USED TO CHECK DLS OPERATION
• THE DEVELOPMENT AND IMPLEMENTION OF THESE TESTS WILL BE DONE IN COOPERATION BETWEEN THE DISTRICTS AND THE OFFICE OF MATERIALS MANAGEMENT, CHEMICAL SECTION.
• CONTACT: MARIA KERESTLY/RANDY DAVIS 614‐275‐1349