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Technical Bulletin 100-B001, continued... INTRODUCTION As noted in the abstract, McMillan Model 100 and 101 gas and liquid micro- turbine flow sensors have been used all over the world for inclusion in products that formerly used ball and tube rotameters. This article features conditions wherein usage of these flow sensors would be a very desirable choice for designers choosing to measure flow rates in original equipment manufacturer (OEM) products. GAS MICROTURBINE FLOW SENSORS Without question, it can be seen from advertising articles that many instruments and analyzers currently employ rotameters to measure gas flow rates when such products employ various gases in the determination of their specific chemical analysis or concentration. Certainly, it is reasonable for a number of such instruments to utilize rotameters primarily because of the cost effectiveness of obtaining gas flow rates for that specific instrument. However, the designer of instruments planning on employing some type of gas flow rate device for a particular instrument should realize that certain advantages in the precision and features of an instrument can be gained by a judicious usage of a flow sensor capable of providing an electronic output signal proportional to gas flow rate. The Model 100 Gas FLO-SENSOR is an option that should deserve serious consideration as it can provide a 0-5 VDC output signal proportional to flow rate. Many current OEM products employing this very small flow sensor have found it to be exactly what they have needed in either designing a new product or in upgrading an existing product that formerly employed rotameters. Here are a number of reasons that caused such designers to choose to use the Model 100 FLO-SENSOR: • Extreme repeatability capability • Very good linearity of out put signal with ±3% of full scale accuracy. (In special cases, it is possible to provide +/- 3% of reading for some applications.) • Large quantity pricing in the low $100 USD range • Fast recovery when drops of liquid pass through the flow sensor as in measurement of certain “wet” or moist gases • Two screw top mounting for ease of installation or removal • Inexpensive 4 pin cable to plug into sensor • Compression tube fittings standard with tube size as specified by user • Rugged design with capability of long life and carrying a limited one year warranty. Figure 1 that follows shows typical repeatability of a 1000 sccm Model 100 gas flow sensor measuring air flow rate around 195 cc/minute. The air flow was 2PDF Image | McMillan Bulletin: 100-B001N MICRO TURBINE FLO-SENSORS WITH A 20 YEAR HISTORY OF PROVIDING A EXCELLENT ALTERNATIVE TO BALL AND TUBE ROTAMETERS
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