The aim of the study is to develop a non-contact fluxgate position sensor to control the open/ closed state of the valve. There are many examples of the use in modern technology of elementsor devices that interact with a magnetic field. One of the most urgent tasks is to use the influenceof the magnetic field as a means of control or as a component of the control environment. The useof magneto-optical sensors for monitoring the functioning of technical objects is due to their noncontactmeasurement method, the ability to measure not only magnetic, but also various otherphysical quantities, the relative simplicity, reliability and low cost of the design of the sensitiveelement, flexibility in use, operation in low-temperature and high-temperature environments.One of the sensors of this type is a fluxgate magnetic field converter. Valves of variouspneumohydraulic systems are an example of the object of introduction of a fluxgate sensor.The essence of the task is to create a non-contact limit switch of the valve spool, signaling theclosed or open state of the valve and transmitting this information to the control system. It is proposedto divide this task into stages and their sequential implementation. First, a search and analysisof existing solutions that implement the position sensor using the fluxgate control method iscarried out to improve the design being developed. Next, the initial design of the sensitive elementof the fluxgate transducer is developed, according to the initial design, a geometric 3D model ofthe sensitive element is created, and the proposed material of the constituent elements of the sensoris selected. With the help of numerical methods of computer simulation, the operation of thesensor is simulated and its output characteristic is determined under various operating modes.According to the design characteristics, the optimal design and configuration of the sensor's sensingelement is selected and calculated. As a result of the simulation, assembly and working drawingsof the sensor are developed. The proposed method for solving the problem is characterized bythe complexity of studying nonlinear magnetic systems and their modeling. The results of this studycan be recommended for the development of magneto-optical sensors of this or another type andfor the study of materials with nonlinear magnetic properties.