{"id":27046,"date":"2023-09-05T08:49:31","date_gmt":"2023-09-05T13:49:31","guid":{"rendered":"https:\/\/test.kele.com\/content\/?page_id=27046"},"modified":"2024-07-16T13:33:11","modified_gmt":"2024-07-16T18:33:11","slug":"signal-conversion-applications","status":"publish","type":"page","link":"https:\/\/www.kele.com\/content\/technical-reference\/transducers\/signal-conversion-applications","title":{"rendered":"Signal Conversion Applications"},"content":{"rendered":"

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Did You Know?<\/h1>\n

Kele can handle all kinds of signal conversion applications.<\/h2>\n

In the building automation business, it’s not uncommon to have requirements for analog signal conversion, signal scaling or signal isolation. The VFD driving a fan requires an isolated 4-20 mA signal but the controller only has grounded 0-5 VDC outputs available. A hot water valve and a chilled water valve, both with 4-20 mA actuators, are to be controlled in sequence from only one 4-20 mA controller output. Kele can provide the solution to these as well as many other signal manipulation applications with our VTI, UAT and DT13 products.<\/p>\n

VTI Voltage to Current Converter<\/strong>
The VTI<\/a> is a compact, low cost voltage to current converter. Any voltage signal from 1 to 19 VDC with a 1 VDC minimum span can be converted into a 4-20 mA signal. The 4-20 mA signal can be configured to be either direct or reverse acting. The VTI is also the solution to other applications. Adding an appropriate value resistor across its input terminals allows the VTI to accept milliamp signals as well as voltage signals. Two valves can be controlled in sequence by using two VTI’s. The first VTI is calibrated to output 4-20 mA over a 4-12 mA input and the second VTI is calibrated to output 4-20 mA over a 12-20 mA input. The VTI incorporates an on-board reference voltage supply that can be used to power external sensing devices or transducers. This reference voltage supply is used when the VTI converts the resistance of a three-wire potentiometer into a 4-20 mA signal. The VTI is powered by 24 VDC, is factory calibrated and is small enough to mount in a standard handi-box. The VTI’s versatility combined with its low cost make it ideal for common as well as unique signal conversion applications.<\/p>\n

APPLICATIONS<\/p>\n