21312 Fairchild Products Model 21 Adjustable Ratio Relay
The Model 21 Adjustable Ratio pneumatic relay has a signal chamber lever arm, whereby the ratio of output pressure to signal pressure is infinitely adjustable. The adjustment range permits signal amplification of 1:30 or signal reduction of 30:1 by rotation of the ratio adjustment knob which moves the fulcrum. . Output pressure is a function of signal pressure times the ratio of lever arm lengths on either side of the fulcrum. Bias may be introduced by means of the set screws. The Model 21D is available with both input and output adjustable bias. Maximum input bias is 3 psig, with a maximum output bias of 9 psig. The basic mathematical expression for the bias in this relay is Po = (Ps-K1) R+K2, where Po = Output pressure, Ps = Input signal, R = Ratio of setting, K1= Input bias, (-) only, and K2 = Output bias, (+) only.
Features
Adjustable from 30:1 dividing ratio to 1:30 multiplying ratio
Venturi aspiration system
Optional input and output biasing
Floating seal ring isolates control chamber
Panel or Line Mounting
Benefits Assures infinite pressure adjustments Compensates for downstream pressure losses Allows versatility in applications Increased stability by reducing effect of high flows Easy installation and service in the field.
Shenzhen Aimiqu Technology Co., Ltd is a high-tech enterprise integrating industrial control product sales, automation engineering design, development and transformation. There are reliable teams with our company, for a variety of industries automation process control needs, to provide reliable, efficient services and automation overall solution. Shenzhen Aimiqu Technology Co., Ltd established in March 2016, the business scope including general management project is automation equipment accessories, instruments and meters, valves, switches, electronic semiconductor, electronic products, digital products, electronic components, communications products, computer software and hardware, security equipment, energy conservation and environmental protection products, intelligent household products; Operating electronic commerce; Domestic trade, import and export of goods and technology. Electrical automation import and export trade for the main business.
Since its establishment, Aimiqu has been providing industrial automation services, providing customers with high-quality products and automation solutions. In the long-term business process, Emicic has established good partnerships with well-known international manufacturers . At the same time,Aimiqu attaches great importance to product research and development, invested a lot of funds, independent production and development of electrical equipment such as power distribution cabinet and put into use. For customers in product performance testing, automated production lines, electronic equipment, wire and cable, and other aspects of energy saving equipment reform and development, design, transform the multitude of automation equipment and automation control system, and provide a reliable and professional support, and pre-sale, sale and after-sale services - dragon, by the customer the consistent high praise.