D7224_13

Select mode A operation. Depress push button A Mark 5 or JET A Mark 10 for mode A operation. Sequential illumination of the lettered push-buttons will cease and the depressed push-button will stay lit. The correct syringe drive speed is set automatically. Depending on which syringe is used, the following procedure shall be followed. Remove the plunger from a new 50 milliliter syringe and wipe the tip using a clean, lintless wipe to remove any sheen caused by excess lubricant. Insert a plug into the exit hole of the syringe barrel, add 50 milliliters plus or minus 1 milliliter of fuel, and place the syringe barrel on the emulsifier mount, turning to lock in place. To mitigate the buildup of static charge, only nitrile gloves are recommended for use while handling the syringe barrel. Flush the barrel of the 50 milliliters aluminum syringe and wipe the plunger tip with toluene or clean jet fuel using a clean, lintless wipe to remove any residue deposited from the previous test. Insert a plug into the exit hole of the syringe barrel. Add 50 milliliters plus or minus 1 milliliter of fuel to the scribe mark in the syringe barrel-- see figure 5 of the written standard-- and place the syringe barrel on the emulsifier mount, turning to lock in place. Ensure that the syringe barrel is properly aligned concentrically with the mixer shaft and not touching the propeller. Proper alignment can be verified by grasping the syringe barrel and moving it until the propeller on the end of the mixer shaft is free and not touching. Misalignment can cause damage to the propeller by the barrel of the aluminum syringe, slow the mixer, causing a poor emulsion, and create shavings from the plastic syringe to form and collect on the coalescer filter material or both, resulting in erroneous test results. This alignment requirement applies to all instruments manufactured prior to July 1988, which have not been serviced by MC Electronics Incorporated since that date. Since July 1988, with ASTM approval, all new instruments and those returned for service have had a standoff installed on the mixer shaft to prevent the syringe barrel from coming into contact with the mixer blades. Initiate the first clean cycle by depressing the Start Mark 5 or Clean 1 Mark 10 push-button button as designated by the annunciator light. Warning, do not operate the mixer without having a syringe with fuel in place. The mixer bearings depend on the fuel for lubrication. The Mark 10 will illuminate error alert and display and ERR-05 when the emulsifier speed is outside of acceptable limits. At the end of the first clean cycle, when the mixer motor stops, remove the syringe barrel from the emulsifier. Discard the fuel and drain the syringe thoroughly. Add 50 milliliters plus or minus 1 milliliters of fresh fuel into the syringe and place the syringe barrel on the emulsifier mount, turn to lock in place. Initiate the second clean cycle by sequentially pressing the reset A and the Start push-buttons as designated by the annunciator lights. Initiate the second clean cycle by pressing the Clean 2 push-button. Add about 15 milliliters to 20 milliliters of the fuel to be tested into a new vial, wipe the outside of the vial with a clean, lintless wiper, and insert the vial into the turbidimeter well, aligning the black mark on the vial at 90 degrees from the white line on the front of the turbidimeter well. Rotate the vial until the black mark on the vial aligns with the white line on the front of the turbidimeter well. See figure 1 of the written standard. At the end of the second clean cycle, when the mixer motor stops, remove the syringe barrel from the emulsifier, discard the fuel, and drain the syringe thoroughly. Add 50 milliliters plus or minus 1 milliliters of fresh fuel sample into the syringe. Handle the syringe in such a manner as to minimize warming of the fuel sample by body heat. Using a fresh plastic tip on the hand pipette, add 50 microliters of distilled water to the fuel sample as follows. Holding the pipette in hand, give a slight twist to the plastic tip to ensure a tight seal. Pushing the plunger, immerse the tip just below the water surface, release the plunger, and withdraw from the water slowly to avoid water drops adhering to the outside of the tip. Immerse the tip of the pipette just below the fuel surface in the center of the syringe-- figure 6 of the written standard-- to ensure the water drops break away cleanly and fall to the bottom. Push and hold in the plunger, withdraw the pipette, and release the plunger. Place the syringe barrel on the emulsifier mount, turning to lock in place. The Mark 5 automatic portion of the applicable test mode program listed in table 3 of the written standard is initiated, with the syringe in place by depressing the Start push-button. The automatic program starts with a read meter indication-- four short tones followed by a 10-second, full-scale adjustment period. During this period, the arrowed push-button will illuminate and can be depressed to adjust the meter to read 100, figure 8 of the written standard. If the adjustment cannot be completed at this time, final adjustment may be accomplished during the second meter adjust period occurring later in the test sequence. The Mark 10 automatic portion of the applicable test mode program listed in table 3 of the written standard is initiated, with the syringe in place by depressing the Run push-button. The automatic program starts with a read meter indication-- four short tones followed by a 2-second to 30-second adjustment period. During this period, the turbidimeter will automatically adjust to 100. If the adjustment cannot be completed at this time, the error alert will illuminate and ERR-04 will be displayed. If for any reason, it is desired to interrupt the sequence and start over, pushing the Reset push-button on the Mark 5 or the Mark 10 instrument will cancel the test in progress and reset the program to the beginning of the clean segment of the test cycle. After the full-scale adjustment period, the mixer motor activates and the emulsion process is initiated. A few drops of fuel may seep from the hole in the emulsifier head during the high speed mixing operation. This should not affect the test results. When the mixer stops after emulsification, remove the syringe barrel from the emulsifier and partially insert the plunger to seal the open end of the syringe, figure 9 of the written standard. Invert the syringe exit hole up, remove the plug, and exhaust the entrapped air in the syringe barrel without significant fuel loss by carefully inserting the plunger to the scribe mark on the plunger, the 50-millimeter mark. Use a clean wiper over the exit hole to capture the small amounts of fuel which may be extruded as foam. Affix the plastic connector to the barrel of the aluminum syringe and attach a new M-Cell coalescer to the other end of the connector, figure 10 of the written standard. The plastic connector is not required with a plastic syringe. To facilitate ease of operation of the plunger into the syringe barrel, wet the tip of the plunger with some of the sample fuel. Place the entire syringe assembly into the syringe drive mechanism, figure 11 of the written standard. To minimize the effective plunger resistance drag in the syringe barrel, align the syringe assembly vertically in the syringe drive mechanism with the end of the syringe plunger parallel with the push bar of the syringe drive mechanism. Position a waste container beneath the M-Cell coalescer to collect the unwanted portion of the processed fuel sample during the coalescing period. Electrically bond M-Cell coalescers to the microseparometer instrument to prevent buildup of an electrostatic charge that could result in ignition of flammable test fluids. Each Mark 5 and Mark 10 instrument is furnished with a ground lead that has an alligator clip on one end and a banana plug on the other. Fasten the alligator clip to the M-Cell coalescer and insert the plug into the chassis ground jack, figure 11 of the written standard. Four short tones will indicate the second meter adjustment period. If required-- Mark 5-- adjust the meter reading to 100. The syringe drive mechanism will start down at the end of the meter adjust period, forcing the water and fuel emulsion through the M-Cell coalescer. During this operation, remove the vial from the turbidimeter well and discard the fuel. Collect the last 15 milliliters of fuel sample being processed from the M-Cell coalescer-- figure 12 of the written standard-- when the collect sample annunciator lamp marked C and S illuminates and a pulse tone of short duration sounds. To lessen the amount of air introduced into the fuel during this operation, position the vial at a slight angle and allow the fuel to flow down the inner surface. Remove the vial just prior to when the last amount of sample is expelled from the M-Cell coalescer. Wipe the outside of the vial with a clean, lintless wiper to remove any fingerprints and fuel. Place the sample vial into the turbidimeter well. Align the marks on the vial and on the control panel in front of the well, figure 1 of the written standard. At the end of the settling time-- 1 minute-- a steady 4-second duration tone will alert the operator that the meter is about to activate. At the end of the tone, the meter will automatically activate for approximately 10 seconds. Read the MSEP rating at the midpoint of the 10-second meter read cycle, indicated by a short, 1-second tone. The Mark 10 stores the reading until another test is performed. Numerical values obtained outside the measurement range from 50 to 100 are undefined and invalid. See 5.4 and note 1 of the written standard.