Automatic dispenser

Automatic dispensers Dispensers of all kind (hot drinks, food, money, etc.)... 

Special appliances Control units Measurement devices Laboratory equipment Life-saving appliances X-ray units Optic appliances Electronic lockers Automatic dispensers Electric tools Average EEE-small parts Connectors, switches, etc. Lightning equipment Cables Average... 

The special apparatus (Fig. 2) consists of two 500 ml Erlenmeyer flasks A and B having slightly rounded bottoms and fitted with Teflon -coated magnetic stirring bars and injection ports, a mercury-filled bubbler back-up prevention valve C, and a mercury-filled automatic dispenser D with airtight-connected insert delivery tube of a buret E. 

Fig. 7.55 Electrically operated fully automatic dispenser (courtesy Master Builders Technologies, Canada).

Fig. 7.56 A portable semi-automatic dispenser (courtesy Eucid Chemicals, USA).

Liquid-liquid extraction Add 3.0 ml of ethyl acetate using an automatic dispenser. Cap tightly, shake and mix vigorously. Centrifuge for 1 min at 2000 rpm (470 xg). 

Oleum is marketed in a range of strengths up to c. 65 per cent S03. From 0 to 30 per cent free S03, it is a liquid from 30 to 55 per cent free S03 it is a solid (maximum m.p. 35 °C at 45% free S03) from 60 to 70 per cent free S03, it is a liquid. The acid must be kept in ground glass stoppered thick-walled bottles. If it is required to melt the acid, the stopper is removed, a watch glass placed on the mouth of the bottle, and the bottle is placed on a uralite board in a warm temperature-controlled oven at 40 °C. The liquid should be removed from the bottle with the aid of an automatic dispenser fitted into the neck this procedure is more satisfactory than that of pouring the liquid acid from the bottle. 

Presently, immunohistochemistry requires improvements in quality, reproducibility, speed, quantitation, and standardization. Some of these goals can be achieved by using computerized bar code-driven automatic immunostainers that automatically dispense reagents, control washing, mixing, and heating to optimize immunohistochemical reaction... 

Fig. 14. Automatic dispensing unit. This multiple dispensing unit (Analmatic Baird and Tatlock) may be employed for the simultaneous addition of three reagents to three separate test tubes. The test tube rack is moved manually along the glides and dispensing is accomplished at each position. The unit will meter samples at the rate of about 24 per minute.

As can readily be seen, there is a considerable technological and electrical complexity involved in this automated scheme of chemical analysis. The cost of complete automation of a clinical laboratory would be outside the reach of most clinical laboratories. However, there are certain units described which might be applicable in large laboratories as individual aids, e.g., automatic dispensing pipets. 

Speed of Analysis. The speed with which many immunochemical analyses can be completed illustrates a major advantage of immunochemical procedures. Immunochemical assays are most time and cost effective when the sample load is large. Parker (4) estimated that a single technician could perform 100-5000 radioimmunoassays per day with little or no assay automation in comparison to 20-40 GLC assays (3). Numerous inexpensive systems are available to decrease analysis time. These systems may include solid phase separation techniques, automatic dispensers, test tube racks which will fit directly into a centrifuge and/or scintillation counter, and data handling systems. Alternatively, there are fully automated systems based on RIA or ELISA which require very little operator attention and which handle 25-240 samples/hr. Gochman and Bowie (81) have outlined the basis of operation and summarized the features of automated RIA systems and extensive literature is available from the manufacturers. 

The adhesive should be processed through automatic dispensing equipment. 

Header systems with manual or automatic dispensing valves have been designed to carry adhesives and sealants over long distances within the plant. Distances of as much as 300 ft are not uncommon with drops at points of application. Figure 17.7 shows a modular header system. Adhesives and sealants are nearly ideal materials for application by robots. Robotic application is commonly used in the automobile industry to increase quality and to reduce labor and material cost.7,8... 

After the precipitate has settled, filter and discard the first 5 mL of filtrate. Pipet 2 mL of the remaining filtrate into a test tube, add 0.2 mL of Phenol Reagent, and mix well. Add 5 mL of sulfuric acid by using an automatic dispenser or by other means that permit mixing within 1 to 2 s. Ensure that the solution has been thoroughly mixed, and allow it to stand for 15 min, then cool to 20° in a water bath for 5 min. 

Scenario Suppose a company that currently manufactures disposable razors and shaving lubricants is developing a new product that combines both shaving and lubricating functions in one. The new design is for a disposable razor that houses shaving gel in a hollow handle. The gel is automatically dispensed through a porous pad just below the blades. Since the product is disposable, the amount of gel in the handle should be matched to the life of the blades. 

Precision in the delivery of the sample volume is of m or importance. Hamilton microsyringes are often used instead of automatic dispensing pipets. 

---