描述
一、产品定位与核心价值
工业级电压测量定位:
UT372B是UT系列中的三相电压专用变送器,支持三相三线(3P3W)或三相四线(3P4W)系统,可同时测量三相线电压(Uab、Ubc、Uca)或相电压(Ua、Ub、Uc),输出标准化模拟信号(4-20mA或0-10V)或数字信号(RS485),便于与PLC、DCS、SCADA系统集成。
与单相电压变送器(如UT172B)相比,UT372B集成三相测量功能,减少设备数量与安装空间,降低系统成本。
与竞品(如西门子SITRANS P320、霍尼韦尔ST3000)相比,UT372B支持更宽的输入电压范围(50-600V AC),且价格更具竞争力,适合中低端工业市场。
核心价值:
高精度测量:采用真有效值(RMS)测量技术,准确反映非线性负载(如变频器、整流器)下的电压有效值,避免传统平均值测量误差。
宽输入范围:支持50-600V AC(线电压)或28-346V AC(相电压),覆盖低压配电系统(220V/380V)到中压系统(690V),适应多场景需求。
多信号输出:提供模拟输出(4-20mA/0-10V)和数字输出(RS485 Modbus RTU),支持同时连接模拟仪表与数字化系统,实现传统与智能监控兼容。
二、核心功能与特性
1.测量功能
三相电压测量:
测量参数:
线电压:Uab、Ubc、Uca(三相三线/四线系统)。
相电压:Ua、Ub、Uc(仅三相四线系统)。
测量范围:
线电压:50-600V AC(默认),可通过软件配置扩展至1000V AC(需定制)。
相电压:28-346V AC(三相四线系统)。
测量精度:
基本精度:±0.2%FS(满量程),温度影响<±0.01%/℃。
响应时间:<200ms(90%阶跃响应),适合动态负载监控。
辅助功能:
电压越限报警:支持两路可编程报警输出(继电器触点),可设置高/低电压阈值,用于过压/欠压保护。
相位识别:通过LED指示灯显示三相电压相位顺序(A-B-C),避免接线错误。
2.输出接口
模拟输出:
类型:双路独立输出(默认配置为4-20mA和0-10V,可互换)。
负载能力:
4-20mA:最大负载500Ω(24V DC供电时)。
0-10V:最小负载2kΩ。
隔离设计:模拟输出与输入电压、电源之间隔离,隔离电压2500V AC(1分钟),避免共模干扰。
数字输出:
接口:RS485(半双工),支持Modbus RTU协议。
通信参数:
波特率:9600/19200/38400/57600/115200 bps(默认19200)。
数据格式:8位数据位、1位停止位、无校验(可配置偶校验)。
地址设置:通过旋转开关或软件配置,地址范围1-247。
3.电气与机械特性
电源:
工作电压:DC 24V(±20%),功耗<5W。
可选电源:支持AC 85-265V(需定制),适应无直流电源场景。
环境适应性:
工作温度:-20℃~+70℃(工业级),存储温度-40℃~+85℃。
湿度:5%-95%RH(无凝露),防护等级IP20(标准DIN导轨安装)。
抗干扰:符合IEC 61000-4-4(快速瞬变脉冲群)和IEC 61000-4-5(浪涌抗扰度)标准,适用于电磁干扰强的工业环境。
机械设计:
尺寸:120mm(宽)×100mm(高)×58mm(深),标准DIN 35mm导轨安装。
接线端子:采用弹簧式端子,支持1.5-2.5mm²导线,接线牢固且防松动。
1.Product Positioning and Core Value
Industrial-grade voltage measurement and positioning:
The UT372B is a three-phase voltage dedicated transmitter in the UT series.It supports three-phase three-wire(3P3W)or three-phase four-wire(3P4W)systems.It can measure three-phase line voltages(Uab,Ubc,Uca)or phase voltages(Ua,Ub,Uc)at the same time,and outputs standardized analog signals(4-20mA or 0-10V)or digital signals(RS485),which are convenient for integration with PLC,DCS,and SCADA systems.
Compared with single-phase voltage transmitters(such as UT172B),the UT372B integrates three-phase measurement functions to reduce the number of equipment and installation space and reduce system costs.
Compared with competitors(such as Siemens SITRANS P320 and Honeywell ST3000),the UT372B supports a wider input voltage range(50-600V AC)and is more competitive in price,suitable for the mid-and low-end industrial markets.
Core Values:
High-precision measurement:Use true effective value(RMS)measurement technology to accurately reflect the voltage effective value under nonlinear loads(such as inverters,rectifiers)to avoid traditional average measurement errors.
Wide input range:Supports 50-600V AC(line voltage)or 28-346V AC(phase voltage),covering low-voltage distribution system(220V/380V)to medium-voltage system(690V),adapting to multi-scenario needs.
Multi-signal output:Provides analog output(4-20mA/0-10V)and digital output(RS485 Modbus RTU),which supports simultaneously connecting analog instruments and digital systems to achieve traditional and intelligent monitoring compatibility.
2.Core functions and characteristics
1.Measurement function
Three-phase voltage measurement:
Measurement parameters:
Line voltage:Uab,Ubc,Uca(three-phase three-wire/four-wire system).
Phase voltage:Ua,Ub,Uc(three-phase and four-wire system only).
Measurement range:
Line voltage:50-600V AC(default),can be extended to 1000V AC through software configuration(customized).
Phase voltage:28-346V AC(three-phase four-wire system).
Measurement accuracy:
Basic accuracy:±0.2%FS(full scale),temperature influence<±0.01%/℃.
Response time:<200ms(90%step response),suitable for dynamic load monitoring.
Accessibility:
Voltage overlimit alarm:supports two programmable alarm outputs(relay contacts),high/low voltage thresholds can be set for overvoltage/undervoltage protection.
Phase recognition:The three-phase voltage phase sequence(A-B-C)is displayed through the LED indicator to avoid wiring errors.
2.Output interface
Analog output:
Type:Dual independent output(default configuration is 4-20mA and 0-10V,interchangeable).
Load capacity:
4-20mA:Maximum load 500Ω(when powered by 24V DC).
0-10V:Minimum load 2kΩ.
Isolation design:Isolate the analog output from the input voltage and power supply,and the isolation voltage is 2500V AC(1 minute),avoiding common mode interference.
Digital output:
Interface:RS485(half duplex),supports Modbus RTU protocol.
Communication parameters:
Baud rate:9600/19200/38400/57600/115200 bps(default 19200).
Data format:8-bit data bits,1-bit stop bits,no calibration(even-calculating can be configured).
Address settings:Configure through rotary switch or software,address range 1-247.
3.Electrical and mechanical characteristics
power supply:
Operating voltage:DC 24V(±20%),power consumption<5W.
Optional power supply:supports AC 85-265V(customized),adaptable to DC power supply scenarios.
Environmental adaptability:
Operating temperature:-20℃~+70℃(industrial grade),storage temperature-40℃~+85℃.
Humidity:5%-95%RH(no condensation),protection level IP20(standard DIN rail installation).
Immunity:Complies with IEC 61000-4-4(fast transient pulse group)and IEC 61000-4-5(surge immunity)standards,suitable for industrial environments with strong electromagnetic interference.
Mechanical design:
Dimensions:120mm(width)×100mm(height)×58mm(deep),standard DIN 35mm rail installation.
Wiring terminals:Use spring-type terminals,supporting 1.5-2.5mm²wires,the wiring is firm and anti-loosening.
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