Overflow weirs have specific purposes as they are utilized in industrial cleaning equipment. Also, as one might expect, there are several manifestations of the overflow weir which perform various functions. A simple “standpipe” is a form of weir as is a fitting on the side of a tank located just below the desired liquid level. …
Overflow weirs are common features of industrial cleaning systems. Simply, a weir is much like a dam that holds back a river to form a lake. In the case of a cleaning system, the “lake” is usually a tank of liquid. The “dam” is formed as a portion of the lip of the tank is …
Previous blogs have discussed the importance of rinsing as part of the overall cleaning process. Because of its importance, many schemes have been devised to assure that parts are adequately rinsed after cleaning. Most of these schemes embrace the “more is better” concept which often leads to overkill as there is often no practical way …
I have stressed the importance of temperature to cleaning processes many times in previous blogs. This blog will discuss the heat source options for achieving and maintaining the temperatures required for effective cleaning. Electric – Electric heat is, without a doubt, the most prevalent heat alternative used for cleaning applications. This is because electric heaters are relatively inexpensive, relatively small, …
How Much Heat? – It is common for the design engineer to calculate the heat requirement for the tanks of a cleaning system based on the tank volume, the target operating temperature and the desired heat-up time from ambient temperature to operating temperature taking into account, of course, heat losses through the tank walls and …
Meaningful temperature measurements depend on the selection of the proper sensors and controls and the proper placement of sensors to accurately measure the targeted temperature. For example, it was previously stated that bimetallic sensors, in most cases, ultimately sense the temperature of air around them. This makes bimetallic sensors a good choice for measuring air …
Preceding blogs have described a number of mechanical means for measuring temperature based on the expansion and contraction of liquids and solids. Another major classification of temperature sensors are based on electrical phenomenon. Thermocouples – A thermocouple sensor utilizes a junction of two dissimilar metals to measure temperature. The principle is based on the fact that an …
In the preceding blog we looked at the expansion and contraction of liquids as a means of measuring temperature. The expansion and contraction of solids (usually metals) is another way to measure temperature. Most solids expand and contract in a relatively linear way in response to temperature changes. In most cases, solids expand as they …
In preceding blogs I have identified temperature as probably the single most important variable in a cleaning process. Devices that sense and control temperature, therefore, are a critical part of a cleaning system. Let’s take a quick look at a few of the types of temperature sensors that are available and suggest where each is applicable …
A third classification of automation is a constantly moving or indexing device that conveys parts through the cleaning process. This can either be in the form of a conveyor that suspends parts on hooks or other fixtures that hang from an overhead track or in the form of a conveyor belt on which the parts rest as …
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