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D3948_14_10

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Select either mode A or B operation. )Refer to table 1 of the written standard for applicable mode for a specific fuel.) Only JP-4 requires mode B operation. Depress either push button A or B (MARK 5.), JET A or JET B (MARK 10) for mode A or B operation, respectively. Sequential illumination of the push buttons will cease, and the depressed push button will stay lit. The correct syringe drive speed is set automatically. Remove the plunger from a new 50 milliliter syringe and wipe the tip using a clean, lint-less 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 milliliters of fuel, 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 is not touching the propeller. To mitigate the buildup of static charge, only nitrile gloves are recommended for use while handling the syringe barrel. Ensure that the syringe barrel is properly aligned concentrically with the mixer shaft. Proper alignment can be verified by grasping the syringe barrel and moving the same until the propeller on the end of the mixer shaft is free and not touching. Misalignment can cause plastic shavings to form and collect on a coalescer filter material resulting in erroneous test results. This applies to all instruments manufactured and those which have not been serviced by Emcee Electronics Incorporated since July of 1988. Since that date 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 as designated by the enunciator 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). Visually inspect that the syringe barrel is properly aligned concentrically with the mixer shaft and is not touching the propeller. Initiate the second CLEAN cycle by subsequently pressing the RESET, A or B, and the START push buttons as designated by the annunciator light. 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. 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 milliliter, 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 pipet, add 50 microliters of distilled water to the fuel sample as follows: Holding the pipet in hand, give a slight twist to the plastic tip to ensure a tight seal, push in the plunger, immerse the tip just below the water's 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 pipet just below the fuel surface in the center of the syringe (Figure 5 of the written standard) to ensure the water drops break away cleanly and fall to the bottom, push and hold the plunger, withdraw the pipet, 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 2 of the written standard is initiated, with the syringe in place by depressing the START push button (see figure 1 of the written standard). If for any reason it is desired to interrupt the sequence and start over, the RESET push button will cancel the test in progress and reset the program to the beginning of the CLEAN segment of the test cycle. The automatic program starts with a read meter indicator (four short tones) followed by a 10-second full-scale adjustment period. During this period, the ARROWED push buttons will illuminate and can be depressed to adjust the meter to read 100 (figure 6 of the written standard). If the adjustment cannot be completed at this time, final adjustment can be accomplished during the second meter adjust period occurring later in the test sequence. 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. The Mark 10 automatic portion of the applicable test mode program listed in Table 2 of the written standard is initiated, with the syringe in place by depressing the RUN pushbutton. 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 an ERR-04 will be displayed. After the full-scale adjustment period, the mixer motor (on both the Mark 5 and Mark 10) activates and the emulsion process is initiated. 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. 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 plunger to the 50 milliliter mark. (Use a clean wipe over the exit hole to capture the small amounts of fuel, which may be extruded as foam). Affix a new Alumicel coalescer to the end of the syringe barrel. Place the entire syringe assembly into the syringe drive mechanism (Figure 7 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 push bar of the syringe drive mechanism. Position a waste container beneath the Alumicel coalescer to collect the unwanted portion of the processed fuel sample during the coalescing period. Electrically bond Alumicel coalescer to the Micro-Separometer to prevent buildup of an electrostatic charge that could result in ignition of flammable test fluids. Both the Mark 5 and Mark 10 instruments are 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 Alumicel coalescer and insert the plug in the chassis ground jack (Figure 7 of the written standard). Other suitable grounding methods may be used for previous models. Four short tones will indicate the second meter adjusts period. If required (Mark 5), the operator should adjust the meter reading to 100. The syringe drive mechanism will start down at the end of the meter-adjust period forcing the water/fuel emulsion through the Alumicel coalescer (Figure 7 of the written standard). 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 Alumicel coalescer (Figure 8 of the written standard), when the collect sample annunciator lamp (marked C/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 Alumicel 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 aligning the marks on the vial and on the control panel in front of the well. 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. MSEP are read at the midpoint of the 10 seconds 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 5.2 of the written standard).

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Duration: 10 minutes and 10 seconds
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Posted by: abuckmaster on Sep 14, 2018

D3948_14_10

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