Sweep device

The sweep device rests on the edges of the trough and is used to clean the surface before the experiment and to compress the film once it is formed. For accurate work, it is preferable that the sweep is attached to support rods (as shown in Fig. 46) which can be moved along the trough by means of a screw drive. It is usually necessary to place the film balance inside an air thermostat, with provision for operation from the outside. 

There are many kinds of point-of-operation devices. They include gates or moveable barrier devices, presence sensing devices, pull-out devices, sweep devices, hold-out or restraint devices, two-hand controls, and hand-feed tools. 

Sweep Devices A sweep device is a mechanism connected to the point-of-operation action of a machine. The device sweeps an operator s hands or body away from the point-of-operation if present when the machine action begins. Some standards do not allow use of sweep devices. In some applications sweep devices can create a shear hazard between the sweep and some other machine component that can cause injury to an operator. 

Underwriters Laboratories 333 Pfingsten Road Northbrook, Id. 60062 Standards for Safety is ahst of more than 200 standards that provide specifications and requirements for constmetion and performance under test and in actual use of a broad range of electrical apparatus and equipment, including household appHances, fire-extinguishing and fire protection devices and equipment, and many other nongenerady classifiable items, eg, ladders, sweeping compounds, waste cans, and roof jacks for trader coaches. 

The U.S. Mine Health and Safety Act of 1969 requires that a mine be closed if there is 1.5% or more methane in the air. The use of an electrical methane detection device is required. High capacity ventilation systems are designed to sweep gases from the cutting face and out of the mine. These systems remove all gases before they become harm fill. 

Provide flow sweep fitting at inlet of relief device... 

First and foremost these venting ducts should be as straight as possible, with few, if any elbows, and even these should be sweeping bends. There should be no valves of any type to keep flow resistance as low as possible, as this creates friction that creates backpressure on the relief device and raises burst conditions, which can be terribly dangerous. Figure 7-66 and 7-67 are used to assess the increased pressure due to ducts on relief discharge as affected by duct length. (This data is limited. See Ref. [56 and 53].)... 

Rapid-Scan Corrosion Behavior Diagram (CRD) Basically, all the same equipment used in the conductance of an ASTM G5 slow-scan polarization study is used for rapid-scan CBDs (that is, a standard test cell, potentiostat, voltmeters, log converters, X-Y recorders, and electronic potential scanning devices). The differences are in technique the slow scan is run at a potential sweep rate of about 0.6 V/h the rapid-scan CBDs at about 50 V/h. 

It is clear, that the various modes of LSV at the dme require an integrated and coherent regulation of sweep time, current sampling and drop knocking, preferably by an electronic device and on with computer guidance. A disadvantage of LSV. at the dme, in contrast to normal DC polarography, is that for mixtures of components the latter yields a simple evaluation by curve extrapolation on the basis of additivity [see Fig. 3.34(a)], whereas the former suffers from an uncertain evaluation [see Fig. 3.34(b)],... 

The invariance of IETS in an M-A-M junction vs an M-I-A-M device is exceptionally well demonstrated by the work of Reed [30], Figure 7 shows the Au-alkanedithiol-Au structure he used to create a single barrier tunnel diode. The IET spectra obtained from this device were stable and repeatable upon successive bias sweeps. The spectrum at 4.2 K is characterized by three pronounced peaks in the 0-200 mV region at 33,133, and 158 mV. From comparison with previously reported IR, Raman, and high-resolution electron energy-loss (HREEL) spectra of... 

As mentioned above, in an ENDOR experiment the rf field is swept while the static magnetic field is held at a constant position in the EPR spectrum. For slow sweep rates and narrow EPR lines a device would be desirable which is able to stabilize the ratio of the microwave frequency to the static magnetic field. The applicaiton of a commercially available field/frequency lock system is restricted to a region of 6 mT about the DPPH resonance field33). In metal complexes with strongly anisotropic EPR spectra, however,... 

Adsorbtion of odours can be minimised in using materials which adsorb little gas plus a design which ensures that the air streams constantly sweeps the entire device. 

---