Device for converting pulse signal into analog signal

The utility model discloses a device for converting a pulse signal into an analog signal, which comprises a signal module and seven contact points, the signal module comprises a first resistor R1, a second resistor R2, a third resistor R3, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, three integrated circuits IC1, IC2 and IC3, a diode D1 and a light emitting diode LD1, and the number of the contact points is seven. The contact points comprise a direct-current power supply interface positive pole DC +, a direct-current power supply interface negative pole DC-, an oil shortage interface OUT +, a common endpoint OUT-, a power supply VCC, a ground wire GND and a flowmeter pulse signal interface IN, the voltage of the direct-current power supply interface DC is + 7-30V, the IC1 integrated circuit is provided with three ports which are respectively connected with the signal modules and the wiring contact points, and the direct-