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The double-needle, double-tube differential pressure gauge is suitable for measuring two pressures, whether they are the same or different, and it can display both of these pressures as well as the difference between them. The instrument consists of two separate measurement systems and indicating devices. The measured pressure is determined through the elastic deformation of pressure-sensing elements; corresponding displacements occur at the ends of these two elements (bourdon tubes), and these displacements are amplified via a lever transmission mechanism. Red and black pointers fixed to the gear shaft indicate the measured values on the dial, while the small dial in between shows the difference between the two pressures. Working principle of the double-needle double-tube differential pressure gauge: The double-needle double-tube differential pressure gauge consists of two separate measurement systems and indicating devices. The measured pressure is determined through the elastic deformation of the pressure-sensing elements; the displacements that occur at the ends of these elements (bourdon tubes) are amplified via a linkage mechanism. The red pointer and black pointer, fixed to the gear shaft, indicate the measured values on the dial respectively, while the small dial in between shows the difference between the two pressures. Original address: yunrun.com.cn/tech/1719.html Instructions for using dual-needle differential pressure gauges: 1. The maximum scale on the dial of a dual-needle, dual-tube differential pressure gauge represents the maximum pressure it can withstand. 2. It is recommended that for dual-pin, dual-tube differential pressure gauges, the △P (differential pressure value = P + —P–) be between one-half and one-third of the dial scale value for optimal performance. If it’s too small, it’s difficult to read. 3. The red needle of the dual-pin differential pressure gauge indicates positive pressure (input pressure is P+) ； The dial needle indicates negative pressure (output pressure P-). The scale on the dial needle, together with the red needle, forms an angle α; the value can be read directly by looking at the scales on the dial. Alternatively, the differential pressure value ΔP = P + —P– can be calculated by using the value indicated by the dial needle on the dial and the value indicated by the red needle on the dial.