Sensitivity balances

Sensitivity requirement is the minimum weight required to move the pointer by one division on the scale. The smaller the weight required to move the pointer by one division, the more sensitive is the balance. Sensitivity requirement (SR) is related to the percent error or maximum potential error by the equation,... 

Analysis. To confirm the value of the S/Ti ratio, the sulfides were chemically analyzed by roasting in air at 900° C. The weighings, made with a balance sensitive to 0.01 mg., gave the ratio with a precision of 0.2% for a quantity of oxidized sulfide on the order of 0.1 gram. In the great majority of cases, experiment showed the discrepancy between the values of the S/Ti ratio determined in the preparation and in the analysis to be less than 0.5%. 

The heat balance sensitivity of the reaction section of the MTG unit was established by determining the effect of varying recycle gas/effluent exchanger performance at maximum and minimum surplus heat for control requirements (see figure 2). 

A modem apparatus is usually equipped with a computer that can calculate the weight loss fraction or percentage. A commercial TGA is capable of greater than 1,000°C, 0.1 pg balance sensitivity and variable controlled heat-up rate under an atmosphere of air or another gas. The heat-up rate capability of TGA can vary from 0. l°C-200°C/min. 

Balances torsion balance sensitive to 0.5 gram, also an analytical balance sensitive to 1 mg Steam baths ovens giving temperatures up to 200° Aspirator pumps... 

According to the standard, the completeness, sensitivity and consistency of the recognized processes or lifecycle phases must be reviewed. Completeness can be checked on the basis of mass or energy balances. Sensitivity can be determined by working out scenarios for different processes and parameter selections. The effects of the different assumptions on the final result then represent the sensitivity factor. 

An other way to determine the areas under the peaks is to cut out the peaks from the chromatogram and weigh them on an analytical balance (sensitivity to 0.1 mg). The weights of the peaks are directly proportional to the relative amount of each compound in the gas sample. ... 

The microbalance technique is shown in Fig. 2-8. This method is based on the use of quartz fibers, which can form a cantilever spring or torsion balance. Sensitivities to 0.1 jug are possible with an electromicrobalance. Several investigators have used this apparatus (for example, Corn, 1961 Hamaker, 1957 Overbeek and Sparnaay, 1954 Stone, 1930). As with any sensitive technique, extreme care must be taken for accurate results. 

The range of applications is governed by the balance sensitivity. If we want to obtain an accuracy of 0.1 % together with a sensitivity of 0.1 mg by using an analytical balance, the precipitate must weigh at least 100 mg. 

To better investigate the effect of the of ingredients composing the mixture n, on the uncertainty of drug concentration, Equation 4 was expanded for fixed balance sensitivity. 

Balance—A laboratory balance sensitive to 0.01 g, suitable for weighing the tube and sample when the sample cannot be pipetted conveniently. 

The shaded area on Figure 9-7 represents where various design point heat balance sensitivity studies have been focused. 

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