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Pt1000 temperature transmitter with wide power supply range

A temperature transmitter, a wide range of technology, applied in thermometers, thermometers and instruments with direct heat-sensitive electric/magnetic components, etc., can solve problems such as inability to use, zero-point drift and transmission accuracy, and ensure safety Effect

Inactive Publication Date: 2015-07-01
VACREE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The zero point drift, current output noise, and the accuracy and temperature drift of the range adjustment resistor will also affect the transmission accuracy.
For example, the PT1000 temperature transmitter disclosed in the Chinese patent authorization announcement number CN 202974490 U cannot be used if the voltage is reversed.

Method used

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  • Pt1000 temperature transmitter with wide power supply range
  • Pt1000 temperature transmitter with wide power supply range
  • Pt1000 temperature transmitter with wide power supply range

Examples

Experimental program
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Embodiment Construction

[0017] Such as Figure 1-4 As shown, the wide-range power supply Pt1000 temperature transmitter includes a housing 1, and a circuit board is arranged in the housing 1. The circuit board includes a main board 2 and a bottom board 3. The main board 2 and the bottom board 3 are installed vertically. The left and right sides of the bottom board 3 Input terminal P1 and output terminal P2 are respectively welded on the right two ends, and three wires are drawn from the input terminal P1. CPU5 adopts XTR114 chip, open circuit detection and signal filtering circuit includes transistor Q2, the emitter of transistor Q2 is connected to the first wire of the input terminal and one end of the resistor RCM, and the other end of the resistor RCM is connected to the Iret pin of the XTR114 chip , a capacitor C3 is connected in parallel to the resistor RCM, the base of the transistor Q2 is connected to the second wire of the input terminal and one end of the resistor RZ, the other end of the re...

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Abstract

The invention discloses a Pt1000 temperature transmitter with a wide power supply range. The Pt1000 temperature transmitter comprises a housing, wherein a circuit board is arranged in the housing; the circuit board comprises a main board and a bottom board which are vertically mounted; an input terminal and an output terminal are welded at left and right ends of the bottom plate respectively; three guide wires are introduced on the input terminal; the main board comprises an open circuit detecting and signal filter circuit, a main control CPU (central processing unit) and a reverse-connection-preventing circuit. According to the Pt1000 temperature transmitter disclosed by the invention, the relationship between the resistance and the temperature can be converted into the relationship between the voltage and the temperature after certain current is added, the reverse-connection-preventing circuit utilizes the one-way continuity of a diode, the safety of the circuit is guaranteed, and the wide power supply range is realized due to the reasonable model and design of elements and circuit.

Description

technical field [0001] The invention mainly relates to the field of temperature transmitters, in particular to a wide-range power supply Pt1000 temperature transmitter. Background technique [0002] When the Pt1000 temperature transmitter uses a loop power supply, it is mostly 24V DC or 36V DC. If the voltage is too low or the polarity is reversed, it will not work properly. The first-order nonlinear correction is often used, and the error is large. The zero drift, current output noise, and the accuracy and temperature drift of the range adjustment resistor will also affect the transmission accuracy. For example, the PT1000 temperature transmitter disclosed in Chinese patent authorization announcement number CN 202974490 U cannot be used if the voltage is reversed. Contents of the invention [0003] The purpose of the present invention is to make up for the defects of the prior art, and to provide a Pt1000 temperature transmitter with a wide range of power supply for...

Claims

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Application Information

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IPC IPC(8): G01K7/18
Inventor 冯欣宇胡旭黄阿娟卞荣耀
Owner VACREE TECH
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