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

Abstract

The invention discloses a two-wire system loop power supply digital display intelligent temperature controller and transmitter integrated instrument. The instrument is used for being connected with equipment such as a PLC controller, a DCS, an electromagnetic valve and a contactor, and the temperature monitoring, remote transmission, control, alarm and equipment protection are realized. Accordingto the instrument, a temperature instrument strides into micropower consumption (microampere level) from low power consumption (milliampere level), the reliability and the stability of the temperatureinstrument are fundamentally improved, the on-site temperature monitoring and 4-20 mA remote transmission, control and alarm are achieved, on-site equipment temperature signals are remotely transmitted to a DCS system or the PLC controller, and the monitoring, control, alarm and protection of equipment in various industries such as industry and traffic are completed. According to the invention, atemperature transmitter, a temperature control switch and a digital display function are integrated, a micro-power consumption 1-5mA signal mode and an electrical isolation mode of the transmitter are realized, a two-wire system of a temperature controller is realized, independent power supply (a common three-wire system temperature controller on the market) is not needed any more, instead, poweris supplied via a signal loop, the unconditional replacement of a mechanical temperature controller is realized, the bottleneck that the mechanical temperature controller cannot be replaced for a long time is solved, protection failures (maloperation and refusal) caused by jamming and drifting of the mechanical controller are solved, the potential safety hazard that a protection system is uncontrollable due to the fact that the mechanical temperature controller cannot be monitored is solved, and therefore, the reliability of the protection system is improved.

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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