248RANA导轨式温度变送器鸿泰产品测量准确经济实惠

罗斯蒙特248RANA温度变送器(导轨式)系列具备基于微处理器的电子元件，具有优异性能和较高灵活性。 采用故障模式的刚性故障跨接线 1 年的长期稳定性 线性化输出与输入/输出隔离 基于微处理器的通用变送器 RTD、热电偶、mV 或 Ohm 输入 可安装于导轨安装套件内，专门为控制室封闭通道而设计 罗斯蒙特248导轨式温度变送器典型型号: Rosemount罗斯蒙特248RANA Rosemount罗斯蒙特

248RANAQ4 Features of the Model 248 include: ?Accepts inputs from a wide variety of RTD and thermocouple sensors ?Configuration using HART protocol ?Electronics that are completely encapsulated in epoxy and enclosed in a plastic housing, making the transmitter extremely durable and ensuring long-term reliability ?A compact size and three housing options allowing mounting flexibility in the field ?Assembly including the transmitter,sensor, housing, thermowell, and extension accessories that can be ordered in one model number Electrical temperature sensors such as RTDs and thermocouples produce low-level signals proportional to their sensed temperature. The Model 248 converts the low-level sensor signal to a standard 4-20mA dc signal that is relatively insensitive to lead length and electrical noise. This current signal is then transmitted to the control room via two wires. The transmitter can be commissioned before or after installation. It may be useful to commission it on the bench,before installation,to ensure proper operation and to become familiar with its functionality. Make sure the instruments in the loop are installed in accordance with intrinsically safe or non-incendive field wiring practices before connecting a HART communicator in an explosive atmosphere. 

罗斯蒙特248温度监测装配件设计符合温度监测应用要求。采用HART?协议的该部安装变送器可与多种传感器、部接线盒和热电偶套管配套订购。所有这些产品均采用能够提供、读数的罗斯蒙特产品设计。

 1、提高温度测量的精度/总体性能

a、变送器按照传感器的实际曲线微调其内部的温度曲线，可大地降低传感器互换性误差（达75%）；644H和644R型智能温度变送器-变送器与传感器比对功能、匹配功能3144和3244MV型智能温度变送器-变送器与传感器匹配功能 

b、热电偶测量时，变送器将毫伏信号转换为对噪声较不敏感的4-20mA信号，提高抗干扰的能力，并大大缩短补偿导线的长度； 

c、热电偶的冷端补偿误差； 244EH和244ER型PC机可编程温度变速器，644H 和644R型智能温度变送器，以及3144和3244MV型智能温度变送器，均具有自动的冷端补偿功能 

d、3244MV型智能温度变送器有温差测量功能，温差测量精度比使用两台变送器分别测量后送至DCS（或将两个传感器的信号直接送至DCS）后计算出温差的方式的精度高几倍。

 2、安装方便 

a、使用变送器后，所有的电缆均相同，为普通的铜导线 

b、拉伸铜电缆比拉伸热电偶的补偿导线容易 

c、电缆的布线容易，没有避开电源的特殊规则 

 3、灵活性大 

a、用温度变送器时，温度测量如其他过程测量（如压力、液位、流量）一样均是4-20mA信号，DCS可使用相同的I/O卡 

b、温度输入可以与其他变送器的输入组合在一起,配置热电偶和热电阻的I/O卡

 4、减少安装、维护和运行等的总体费用 

a、铜电缆比热电偶的补偿导线 

b、使用铜电缆，单的电缆架和导线管，意味着安装 

c、DCS的I/O卡类型相同，减少卡件数量和不使用的接线端子数量 

d、智能型变送器有诊断功能，可和判断出是传感器故障还是过程报警，从而减少到现场维护的次数，这意味着很大的维修节约 

e、好的温度测量性能，可提高生产率，意味着很大的生产节约

 Industry’s best total performance,a a flexible Coplanar platform,and installed five-year stability,has made the Rosemount 3051 the standard in pressure measurement. Inustry’s best-in-class total performance of ±0.15% Total performance is the true measure of “real-world”transmitter performance. Using superior sensor technology and engineered for optimal performance,the 3051 delivers unprecedented ±0.04% reference accuracy,resulting in total operating performance of ±0.15%. Superior total performance equates to reduced variability and improved plant safety.