SDVE28 series displacement transducers are stainless steel displacement transducers that convert linear displacement into analogue voltage. Because of its integral structure, it has excellent durability and environmental resistance, and its operating temperature range is from -20℃ to 120℃. Pressure by the primary coil, secondary coil and movable iron core composition, in the primary coil with a certain voltage, frequency of sinusoidal excitation, movable iron core so that the secondary coil produces an induced voltage, its output characteristics for the two secondary coils of the difference between the output is the same frequency as the excitation signal of the alternating current voltage, through the detector circuit transformed into a pressure is output.

Detection circuit consists of rectifier diode and RC filter, the measurement range is the movable core travel, generally a few mm ~ hundreds of mm. When the movable iron core is in the centre position, the output voltage is 0V: when it moves left and right, it generates positive and negative voltages proportional to the moving distance. The linearity is less than 1%, and the detection accuracy reaches several μm; the error increases when the specified travel is exceeded.