Two-wire loop power supply digital display intelligent temperature controller and transmitter integrated instrument

Abstract

The invention discloses a two-wire loop power supply digital display intelligent temperature controller and a transmitter integrated instrument, which is used to connect with PLC controllers or DCS systems or electromagnetic valves, contactors and other equipment to realize temperature monitoring and remote transmission. , control, alarm and equipment protection, the present invention makes the temperature instrument step into micro-power consumption (micro-ampere level) from low power consumption (milliampere level), which will cause the fundamental improvement of the reliability and stability of the temperature instrumentation, and realize the On-site temperature monitoring and 4‑20mA remote transmission, control and alarm, remote transmission of the on-site equipment temperature signal to the DCS system or PLC controller, to complete the monitoring, control, alarm and alarm of equipment in various industries such as industry and transportation protection; the present invention combines temperature transmitter, temperature control switch, and digital display functions into one, realizes the micro power consumption 1-5mA signal mode and electrical isolation mode of the transmitter, and realizes the two-wire system of the temperature controller, without A separate power supply is required (three-wire thermostats are common on the market), but power is supplied through the signal loop to unconditionally replace the mechanical thermostat, which solves the bottleneck that the mechanical thermostat cannot replace for a long time. The protection failure (misoperation and refusal) caused by mechanical controller jamming and drift solves the safety hazard that the mechanical thermostat cannot monitor and cause the protection system to be uncontrollable, thereby improving the reliability of the protection system.

Description

technical field [0001] The invention relates to the technical field of intelligent temperature instruments, in particular to a two-wire loop power supply digital display intelligent temperature controller and transmitter integrated instrument. Background technique [0002] For a long time, the precision of the mechanical temperature controller is poor, and jamming and drifting occur from time to time, causing various equipment protection malfunctions and refusal to operate, resulting in accidents and equipment damage. The three-wire temperature controller needs a separate power supply, the management of the power supply, and the reliability of the power supply are difficult to guarantee. Due to reasons such as the line voltage drop of the long-distance power supply, it does not meet the requirements of the dry contact of industrial control, forming a mechanical temperature control in the industry. Device occupation, especially when it is occupied by imported mechanical tempe...

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Problems solved by technology

[0002] For a long time, the precision of the mechanical temperature controller is poor, and jamming and drifting occur from time to time, causing misoperation and refusal of various equipment protections, resulting in accidents and equipment damage

The three-wire temperature controller needs a separate power supply, the management of the power supply, and the reliability of the power supply are difficult to guarantee. Due to reasons such as the line voltage drop of the long-distance power supply, it does not meet the requirements of the dry contact of industrial control, forming a mechanical temperature control in the industry. Occupied by devices, especially by imported mechanical temperature controllers

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