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HFRR (High Frequency Reciprocating Rig)
/ Standalone mode
Running a test in standalone mode
On this page: Selecting a test | Test Procedure
Selecting the Test
The electronics unit is pre-programmed with several standard tests which the HFRR can perform. From the main menu NEXT and PREV cycle through the list of standard tests. See standalone settings for more information.
Full details of the instrument parameters (stroke length, frequency etc.) for each of these methods can be found in the relevant specification.
At the time of writing, there is no standard test for the testing of gasoline, but the test conditions generally used are the same as the ASTM D6079 (25°C) diesel fuel procedure.
Test Procedure
STEP 1 - Test Preparation
Follow the Test Preparation instructions in the Test Preparation section to clean and attach new upper and lower specimens to the instrument.
STEP 2 - Starting a Test
If the test method requires the calculation of the humidity corrected wear scar diameter (WS1.4) then the ambient humidity and temperature must be recorded at the start and end of the test. If the optional temperature/humidity probe is connected to the electronics unit, the start and end temperature and humidity will be taken automatically. If not the measurements will have to be recorded manually using a suitable humidity/temperature meter.
Select the required test method using NEXT or PREV, then press START. If the selected test method requires the calculation of the corrected wear scar (WS1.4) then the following screen will be displayed:
Pressing NO will skip to the entry of the fuel name [shown in step 4]. Pressing YES will prompt the user to select the fuel type:
STEP 3 - Select humidity correction factor
After selecting the correct fuel type. The humidity correction factor for the type of fuel selected can then be confirmed. For example, if the high reference fluid is selected, the display will show:
The humidity correction factors can be changed from the setup menu. See standalone settings for information.
STEP 4 - Enter fuel name
The next screen prompts the user to enter the fuel name.
The cursor is positioned under the first letter of the fuel name. Use + or - to change the letter under the cursor. Use -> to move to the next letter and CLEAR to clear the character under the cursor. Once the fuel name has been entered, press OK.
STEP 5 - Enter Start Ambient Humidity and temperature
If the selected test method requires corrected of the wear scar (WS1.4) and the temperature/humidity probe is not attached, the display will read:
Enter the start RH using the editing keys as before then press OK. The next screen will then be displayed:
Enter the start temperature using the editing keys as before then press OK.
If the temperature/humidity probe is fitted, the two screens shown above will not be displayed, since the measurements will automatically be taken and the test will start after entering the fuel name.
STEP 6 - Start test
Once the test has started the following screen will be displayed:
Once the temperature has stabilized, the vibrator will start and the test proper will commence. The 'Testing' LED at the side of the display will illuminate red.
If you press STOP at any time, the test will be aborted.
STEP 7 - Test completed
When the test duration has elapsed the vibrator will stop and the heater will switch off. If the selected test method requires the calculation of the corrected wear scar (WS1.4) and the temperature/humidity probe is not attached, the instrument will prompt the user for the final humidity and temperature.
If the temperature/humidity probe is fitted the measurements will automatically be taken and these screens will not be shown.
STEP 8 - Measuring wear scar
The next screen prompts the user to enter the measured X and Y dimensions of the wear scar.
Remove the upper specimen holder and measure the wear scar on the specimen in the X and Y directions in microns. The dimension across the direction of specimen motion is the X dimension.
More information can be found in the interpretation of results section.
STEP 9 - Recorded data
The test is now complete. The results of the test will then be displayed. If the selected test method requires the calculation of the corrected wear scar (WS1.4) then the results are split over two screens, otherwise there is just one results screen.
The values are the X, Y and average dimensions of the wear scar (uncorrected); the average temperature of the fuel; the average friction coefficient between the specimens and the average "film" between the specimens.
Press RESULTS2 to move to the next screen (if available).
The RESULTS2 screen shows the start and end temperature and humidity together with the start (AVP1), end (AVP2) and mean AVP (absolute vapour pressure). WS1.4 is the humidity corrected wear scar diameter.
Pressing DONE displays the unique test identifier and gives the user the option to save the data (press SAVE) or to re-enter any of the measured information (press AGAIN).
The unique test identifier is a combination of the instrument serial number and the date and time that the test was started. This identifier will be unique across all HFRR instruments. The data is stored in the test history which can save the last 50 tests performed by the instrument.
STEP 10 - Mini printer option
If a mini printer is attached to the instrument, a further screen gives the option to print a test report for reference.
