The working principle involves the direct application of the medium's pressure onto the sensor's diaphragm, causing a minute displacement proportional to the medium pressure. This displacement alters the sensor's resistance, which is then detected by an electronic circuit. The circuit converts this change into a standard signal corresponding to the pressure.

Instructions: 1. The instrument should be used within a temperature range of -40 to 70°C, with a relative humidity not exceeding 80%. If the temperature deviates from the normal operating temperature by more than 20°C, the temperature additional error must be accounted for. 2. The instrument must be installed vertically, aiming to keep the same level as the measuring point. If there is a significant difference, the additional error caused by the liquid column should be considered, which is not applicable when measuring gases. During installation, block the explosion-proof opening at the rear of the instrument case to avoid affecting its explosion-proof performance.