- Nous contacter
The VibroDeairator is meant to automate the manual sample agitation described in AASHTO T209 and ASTM D 2041 specifications, freeing the lab technician for other duties. The unit is designed to allow the use of three different types of pycnometers in various sizes. These would be the two sizes of glass filter flasks Model GW-75 (2 liter), and GW-76 (4 liter), the two aluminum pycnometers Model SG-16 (2000g), and SG-17 (1500G), and the plastic pycnometer Model SG-15. The aluminum pycnometers are the only units not requiring adapters. The glass flasks require the Model SGA-8 Adapter Set, consisting of an upper adapter ring and base pad. The plastic unit requires the Model SGA-7, consisting of a base adapter, and upper adapter with foam ring. These pycnometers should only be used with the correct adapters. Failure to do so can result in damage to the pycnometers or injury to the operator. It should be noted that although this unit may work with many other manufacturers' pycnometers, it has only been tested with the previously mentioned models and cannot be guaranteed to function correctly with other pycnometers. The following pages show the unit with adapters and pycnometers.
The VibroDeairator is shipped without the height adjustment rods attached to minimize potential damage during shipping. All that is required is to remove the nut closest to the end of the rod, insert the rod through the hole on the right hand side of the base plate and, using two 9/16" wrenches, tighten the nuts securing the rod. Repeat for the left side.
The glass flask pycnometers (See Figure 1) are placed on the rubber base pad (this pad is centered by the four rubber bumpers on the base), the top adapter (aligned between the bumpers on the top plate) and top plate are placed on the adjustment rods and over the neck of the flask. The black plastic knobs are adjusted leaving a small gap; the speed knobs are then dropped over the rods and tightened. Before turning on the VibroDeairator always check both sets of knobs. Overtightening can result in loss of action or actual damage to the pycnometer. The pycnometers need to be secured but not overtightened.
The aluminum pycnometer (See Figure 2) is placed on the agitator base between the rubber bumpers, and the top plate is then placed on the unit. The black plastic knobs are adjusted for a minimal gap and the speed nuts are placed over the rods and tightened, securing the unit. Before turning on the VibroDeairator always check both sets of knobs. The slot in the top plate allows for vacuum hoses to remain
The plastic pycnometer (See Figure 3) is placed in the adapter ring (located between the four rubber bumpers on the base), and the upper adapter with the foam side down is placed between the four rubber bumpers on the top plate and over the adjustment rods. The black plastic knobs are adjusted for a small gap; the speed nuts are then placed over the rods and adjusted to secure the pycnometer. Before turning on the VibroDeairator always check both sets of knobs. Overtightening can result in damage to the pycnometer. The pycnometers need to be secured but not overtightened.
Before beginning the test, place the VibroDeairator on a dry, flat surface and connect the power cord. To begin a test it will be necessary to determine the amount of vibration necessary to dislodge the air. Put the unit in manual mode (See Figure 4) by pressing the top portion of the mode switch on the left and then adjusting the amplitude knob on the right.
NOTE: The amplitude control, from the OFF position goes immediately to maximum and is adjustable clockwise to minimum. Due to varying pycnometer and sample weights, the user should determine the minimum vibration necessary to dislodge entrapped air without breaking down the sample. It is possible that excessive vibratory action will degrade the sample particles by abrasion. The next step is to set the timer (normally 15 min.) by depressing the four buttons on the front to set the minutes and seconds see figure 4). Each depression of the button increments the individual digit.
Next, start the test by putting the mode switch in the TIMED mode. The unit will run for the time set and stop. The timer need not be reset unless a different time duration is required. By cycling the mode switch from OFF to TIMED additional tests may be ran. For 230V/50Hz operator must use the TR-200 step-down transformer or equivalent.
On the rear of the unit is a power entry module with 2 amp fuses. A spare fuse is located in the fuse tray should it be needed.