Bench Testing
2-2
测试设备
电源: 万用表: 电阻箱 热电偶信号发送器: 12–42.4 V dc 4 1/2 Digit
Fluke 8840A
0.01% 精度
General Resistance 热电阻-100
0.01% 精度
ECTRON 1120
回路负载: HART 通讯:
Minimum 250 欧姆
Bench Testing
2-4
接线盒
传感器接线端子
显示连接口 + 电源接线端子
_
Emerson Process Management - Educational Services - Rosemount Measurement - 644 Smart Temperature Transmitter Training - June 2006 - Copyrighted Material - Duplication Prohibited
Common Tasks
4-1
常用功能
本章节主要演示用HART 通讯实现常用功能。通 过本章学习后, 你将知道: 1. 选择输入传感器. 2. 更改PV单位. 3. 改变量程上限各下限值. 4. 组态离线. 5. 测试设备. 6. 回路测试.
Emerson Process Management - Educational Services - Rosemount Measurement - 644 Smart Temperature Transmitter Training - June 2006 - Copyrighted Material - Duplication Prohibited
Overview
1-3
电气模块
– 工厂密封 – 不可修复
Emerson Process Management - Educational Services - Rosemount Measurement - 644 Smart Temperature Transmitter Training - June 2006 - Copyrighted Material - Duplication Prohibited
镍基热电偶合金
铜镍合金 Platinum Platinum
Color Code Red Red Red Red Red Red
Emerson Process Management - Educational Services - Rosemount Measurement - 644 Smart Temperature Transmitter Training - June 2006 - Copyrighted Material - Duplication Prohibited
技术培训
644温度变送器
Prepared by Educational Services Eden Prairie, MN (USA) Released July 2001 Revision June 2006技术落后
目录
概述 标定测试 HART 通讯 公共部分 组态 校验 安装 1-1 2-1 3-1 4-1 4-1 5-1 6-1
Common Tasks
4-2
可以选择传感器
铂 热电阻s
2-, 3-, or 4-wire Pt 100, Pt 200, Pt 500, Pt 1000: a = 0.00385: Pt 100: a = 0.003916 (0.00392) Ni 120 2-, 3-, or 4-wire Cu 10 2-, 3-, or 4-wire
Bench Testing
2-5
标准测试
+ 250 欧姆
电源
4.00 mA
mA Meter
电阻箱 1 2 3 4
2-wire 热电阻 3-wire 热电阻 4-wire 热电阻 热电偶
T/C 模拟器 - mV 信号源
-
+
Emerson Process Management - Educational Services - Rosemount Measurement - 644 Smart Temperature Transmitter Training - June 2006 - Copyrighted Material - Duplication Prohibited
Bench Testing
2-1
标定测试
在本章中将学习在试验室怎样测试 Model 644温度变送器. 完成本章节学习后你将了解以下内容: 1. 校验所必需的设备. 2. 了解回路负载图表. 3. 正确的电气线路连接. 4. 变送器的标准测试.
Emerson Process Management - Educational Services - Rosemount Measurement - 644 Smart Temperature Transmitter Training - June 2006 - Copyrighted Material - Duplication Prohibited
Bench Testing
2-3
电源要求
4–20 mA dc 1250
1100 1000
Load (欧姆)
500
250
HART 通讯回路负 载 0
Operating Region
10
12.0
20
30
40 42.4
最小电源电压 (V dc)
最小负载= 43.5* (端子电压 –12.0)
Emerson Process Management - Educational Services - Rosemount Measurement - 644 Smart Temperature Transmitter Training - June 2006 - Copyrighted Material - Duplication Prohibited
热电偶
热电偶是由2种特性不同的 金属导体所做 (如: 铁和 铜镍合金)，在一端连接 在一起。没有拧在一起 的一段与仪表相连 (电压 表)，测量2中金属之间产 生的电压. 不同金属件的电压是不同 的 (millivolt).
Temperature Sensors
1-3
High T/C
Low T/C
TC Wire Characteristics
Overview
1-2
方块图
A/D转换
参考输入
冷端补偿
ISOLATION
微处理单元： - 传感器线性 - 量程 - 诊断 - 工程单位
Nonvolatile Memory - 量程范围 - 组态 - 修正系数 - 标定常数
D/A转换
数字通讯
A/D
µ Communications
D/A
Emerson Process Management - Educational Services - Rosemount Measurement - 644 Smart Temperature Transmitter Training - June 2006 - Copyrighted Material - Duplication Prohibited
Emerson Process Management - Educational Services - Rosemount Measurement - 644 Smart Temperature Transmitter Training - June 2006 - Copyrighted Material - Duplication Prohibited
故障维修
7-1
Overview
1-1
概述
在本章节中，你将学习到644系列温度变送器工作原理 以及组成部件、测量技术、附件、规范要求. 完成本章节学习后你将了解以下内容: 1. 识别和描述的主要组件和这些组件的功能。 2. 了解工作模块的原理。
3. 了解主要的技术规范。
Emerson Process Management - Educational Services - Rosemount Measurement - 644 Smart Temperature Transmitter Training - June 2006 - Copyrighted Material - Duplication Prohibited
TC Type E J K T R S Positive leg Wire Color Material Code 镍铬合金 Purple 铁 White Yellow 镍铬合金 铜 Blue Plat 13%Rho Black Plat 10%Rho Black Negative Leg Wire Material 铜镍合金 铜镍合金
Temperature Sensors
1-2
温度传感器
4 to 20 mA Signal 4 to 20 mA Signal
温度传感器
传感器产生一个可变的电信号输出随着温 度的变化。如:
热电偶Thermocouple - 毫伏Millivolt 热电阻RTD – 阻值随温度而改变
Transmitter Electronics Transmitter Electronics
Resistance Temperature Device
对于热电偶和热电阻，可变信号下限部分 必须与变送器相匹配，通过变送器产生 一个可靠，标准的信号 (4-20 mA /HART)
RTD Resistance changes with Temperature
Thermocouple Voltage Output changes with Temperature