Four-wire four-wire single-head single head heating rod heating rod is usually only the electric resistance heating with a hot rod. Generally are a single-head heating tube outlet, the two lines are used to connect the power supply. And the four-wire single-head heating rods more of two lines, the two lines is the thermal resistance, is used to measure the heating process the temperature of the heating tubes themselves. This is a built-in temperature measurement method. The specific requirements of heating pipe is custom-made according to customer needs, four-line single-head heating rods because the four lines that is, to built-in thermal resistance so the diameter is too small is not good to do, and generally limited to a single four-wire electric tube head Straight point heating rods, so customers need to purchase consulting and confirm with the manufacturer. URL: http://www.ycrgdr.com Sun Xiaoxiao: 18961984405 QQ: 871739826 heating pipe, single-head heating tube, flanged heater, finned heater, stainless steel heating tube, U-shaped heat pipes all in - Swiss high electric site: http://www.ycrgdr.com This page URL is: http://www.ycrgdr.com/products/1/404.html