vishay BLH和Nobel称重系统

Accuracy Calculation 精度计算
= 10 °C = 0,003 % of nominal capacity / °C = 0,003% 0 003% of applied load / °C
Calculate the accuracy 精度计算: 2 2 P 1 / 3 0,05% 0,01% 2000kg 0,003% 10C 6000daN 0,003% 10C 1500kg 0,003% 10C 2000
VPG Product/Division Process Weighing Name
Weigh Indicator Type G4-PM G4-PM称重控制器
•LCD color touch screen LCD彩色触摸屏 •Interface Windows CE Windows CE环境 •Converter A/D A/D转换： 16 000 000 div. (24 bits) •Resolution 解析度 : 0,1 μV/Div •Up to 8 x weighing systems in one G4 一台G4可处理控制多达8组称重系统(八通道) •Panel mount IP65 or table mount 盘面安装 IP65或者桌上型 •Serial com串口通讯 :RS232 – RS485 Modbus RTU •Serial com串口通讯 : Ethernat Modbus TCP / IP •Two relays output 两组继电器输出（一个称重模块） •Four digital inputs 四组数字输入（一个称重模块） •OPTION总线选项: PROFIBUS DP – DEVICE NET g outputs 模拟量输出 •Analog
Weighing system concept 称重系统概念
WST-3
Profibus RS485 Modubus RTU
PC
4-20 mA
AST-3P/IS
RS485 Modubus RTU
PLC/DCS
4-20 mA
RS485 Modubus RTU
4-20 mA
TAD-3
Weight W i ht Temperature Pressure Flow
– – – – – – – – – – N N.L. HYS REP E.M. 0f(t) Pf(t) F.A TA E.C. Number of load cell 传感器数量 Non Linearity 非线性 Hysteresis 迟滞性 R Repeatability t bilit 重复性 Nominal capacity of load cell 传感器额定量程 Zero drift with Temperature: %/°C of E.M. 零点温度系数 Si Signal ld drift ift with ith T Temperature: t %/ °C of f the th applied li d l load d 输出温度系数 Applied load 应用负载 Tare: dead weight of the tank 皮重：桶槽重量 Combined error : Non Linearity & Hyteresis 综合误差：非线性和迟滞性
Vishay Systems PROCESS WEIGHING SYSTEMS 过程称重系统
Tel:022-28359605 Fax:022-28131682 Mobile: 13920370320 Email: jin.jin@
VPG Product/Division Process Weighing Name
VPG Product/Division Process Weighing Name
Safe Side Loads Loads, Very low incidence on accuracy 可安全使用在有侧向力的情况,且对精度没有影响
KIS8 & KIS2 l load d cells ll concept t KIS8 & KIS2传感器概念
Maximum beam flexure: 0,25% to 0.3% with KIS load cells while it is 0,1% Maximum with compression load cells 使用KIS传感器，最大容许梁弯曲为 传感器 最大容许梁弯曲为: 0,25% 0 25% to 0.3%；当使用柱式传感器时，最大容梁弯曲仅 为 0,1%
Other factors influencing the accuracy 影响精度的其他因素
Linearity curve with mechanical environment and loadcells accuracy 传感器及机械结构总合的线性曲线
Loaded Tank
KIS load cells will pp horizontal support forces due to thermal expansion and due to agitation without any disturbances KIS传感器可支持因温度 效应产生的水平力，及因 生的水平力 及因 搅拌产生的水平力而不 会对精度产生影响
Safe Side Loads, Loads Very low incidence on accuracy 可安全使用在有侧向力的情况,且对精度没有影响
Load Misalignment 受力点未对准
Side Loads 侧向力
Tank Thermal Expansion 桶槽热胀冷缩
VPG Product/Division Process Weighing Name
Chart Recorder
VPG Product/Division Process Weighing Name
Weighing System 称重系统
Loadcells KIS9 Accuracy 1500 To 2000 divisions KIS9传感器 感 精度 1500至2000分度 TAD3 - AST3-P WST3 - AST3-IS – G4 Loadcells KIS8 Accuracy ~ 2000 to 3000 divisions 感 KIS8传感器 精度2000至3000分度
VPG Product/Division Process Weighing Name
Transmitter WST3 WST3变送器
As standard 标准品： Internal resolution 内部解析度 > 8 000 000 divisions Analog output 模拟量输出 4 – 20 mA 16 bits Serial communication 串口通讯 RS485 MODBUS RTU Two relays output 两组继电器输出 1 A – 30 V Two digital inputs 两组数字输入 Field bus 现场总线 : PROFIBUS DP
Load Misalignment 受力点未对准
Side Loads 侧向力
Tank Thermal Expansion 桶槽热胀冷缩
VPG Product/Division Process Weighing Name
KIS9 load l d cells ll concept t KIS9传感器概念
Calculation example:计算案例 Mixing tank weighing on 3 loadcells type KIS8 – 20 kN (2000 kg) 使用3只KIS8 – 20 kN (2000 kg)传感器混料桶 Live load 物料重量 = 1 500 kg Dead weight of the tank 桶槽皮重 = 2 000 kg Temperature variations around loadcells 传感器周围温度变化 Zero drift 零点温度系数 Signal drift 输出温度系数 Weighing transmitter 变送器型号: type WST3 Loadcells type 传感器型号 : 3 x KIS8 – 20 kN Combined error 综合误差 : 0,05 % de E.M.
Load Cell Main Specification 传感器主要规格
VPG Product/Division Process Weighing Name
Accuracy Calculation 精度计算
•• •
Ca cu at o accu Calculation accuracy acy formula o ua 精度计算公式 Designation说明:
Strain Gages Wheastone Bridge Principle 应变计惠斯通电桥原理
VPG Product/Division Process Weighing Name
Electrical Wiring 线路图
VPG Product/Division Process Weighing Name
Linearity curve of the loadcells alone 传感器的线性曲线
Loaded Tank
Linearity curve after TAD3 linearisation with loadcells and mechanical environment 传感器及机械结构经TAD线性校 后的线性曲线 正后的
Structure
VPG Product/Division Process Weighing Name
Other factors influencing the accuracy 影响精度的其他因素
Thermal Expansion 温度效应(热胀冷缩)
Vibrations 震动
Agitation 搅拌
Linearisation in 6 points with TAD3 during calibration TAD3使用6点校正 的线性曲线
Ideal curve 理想直线曲线
Structure KIS loadcells will support horizontal forces due to the mechanical environment KIS传感器不受因机械 结构产生的水平力影 响
P 1 / 31,019daN 1,8daN 0,45daN 0,6daN Accuracy 精度 P=2,32 kg or +/- 1,16 kg If an Auto Tare is done via the PLC, the zero drift with temperature and the signal drift with temperature connected the dead weight of the tank are equal to 0. The total accuracy becomes: 如果经由PLC自动去皮归零，则零点的温度漂移与桶槽静重输出的温度漂移皆视为0。则精度 变为: P 1 / 31,019daN 0daN 0daN 0,6daN
A Accuracy 精度P=0,934 P 0 934 kg k or +// 0,467 0 467 k kg
VPG Product/Division Process Weighing Name
Other factors influencing the accuracy 影响精度的其他因素
Flexible pipe should be, preferably horizontal and the length of flexible pipe should be 10 times the pipe diameter 管线必须柔韧可变曲 最好 水平方向安装 管线必须柔韧可变曲，最好以水平方向安装， 且长度为管直径的十倍以上为宜
VPG Product/Division Process Weighing Name
Compression loadcells will react to horizontal forces due to mechanical environment 柱式传感器会受因机 械结构产生的水平力 生的水 力 影响
P 1 / N
N.L.2 HYS2 REP.2 E.M. 0 f t E.M. Pf t F.A. Pf t T

VPG Product/Division Process Weighing Name