The invention belongs to the technical field of industrial
automation instruments, and particularly relates to a self-powered temperature
transmitter, which comprises an explosion-proof cast aluminum shell, a circuit board and a
lithium battery, and is characterized in that the circuit board comprises a
microcontroller MCU, a
signal conditioning circuit, an analog-to-
digital converter ADC, a
power management circuit and a display
driving circuit; the average working current of the whole
machine is reduced to a microampere level by adopting multi-stage low-power-consumption design such as an ultra-low-power-consumption MCU, a low-quiescent-current power supply
chip, a programmable sampling interval and intelligent backlight control, and the theoretical endurance time can reach several years in cooperation with a high-capacity
lithium battery, so that the constraint of an external power supply and a cable is thoroughly eliminated; according to the technical scheme,
signal range
adaptation is achieved through a
programmable gain amplifier on hardware, a full-scale
linearization algorithm is built in
software, various common industrial temperature sensors such as Pt100, Cu50, K, S, E, J, T and N can be compatible only through panel key selection, and the universality and field applicability of equipment are greatly improved.