目录一、概述………………………………………1二、功能特点…………………………………1三、主要技术指标……………………………1四、工作原理…………………………………2五、操作说明…………………………………3六、数学模型…………………………………10七、编程举例…………………………………11八、通讯说明…………………………………12九、端子接线…………………………………13一、概述智能流量积算仪,采用先进的微电脑芯片及技术,与各种流量传感器或变送器、温度传感器或变送器和压力变送器配合使用,可对各种液体、蒸汽、天然气、一般气体等流量参数进行测量显示、累积计算、报警控制、变送输出、数据采集及通讯。二、功能特点全范围自动温度、压力补偿运算,补偿方式任意设定线性积算、开方积算任意设定瞬时流量、累积流量、温度、压力多种参数显示小信号切除功能,切除范围0-5%可选累积流量值可通过面板按键清零,清零操作可锁掉电保护功能,累积流量值掉电保持时间大于5年,所有设定值掉电后永久保持先进的模块化结构,配合功能强大的仪表芯片,功能组合、系统升级非常方便三、主要技术指标输入信号(1)模拟量输入:热电阻:Pt100热电偶:K、T、E电压:0~5V、1~5V电流:4~20mA、0~20mA或0~10mA(2)脉冲量输入:波形:矩形、正弦或三角波幅度:大于4V(或根据用户要求任定)频率范围:0~10KHz基本误差:0.5%FS或0.2%FS±1个字分辨力:1/20000、14位A/D转换器显示方式:上排四位数码管显示瞬时流量,下排八位数码管显示累积流量采样周期:0.5S1报警输出:瞬时流量或累积流量二限报警,继电器输出触点容量AC220V/3A变送输出:4~20mA、0~10mA、1~5V、0~5V精度:±0.3%FS通讯输出:接口方式—隔离串行双向通讯接口RS485/RS422/RS232/Modem波特率——300~9600bps内部自由设定馈电输出:DC24V/50mA电源:开关电源85~265VAC功耗4W以下使用环境:环境温度:0~50℃相对湿度:85%RH四、工作原理本仪表原理如框图所示,本积算仪以单片微处理器为核心,通过输入信号电路把各种模拟信号经A/D转换器转换成数字信号,或频率信号直接由微处理器进行计数采用,微处理器根据这些采样结果和数字设定内容进行计算并显示和输出。2开关量输入电路模拟量输入量通道开关光电隔离A/D单片机LED显示面板设定变送输出光电隔离通讯接口五、操作说明(一)仪表面板如图所示,左侧三个指示灯依次为:①瞬时流量指示灯②压力指示灯③温度指示灯右侧二个指示灯为①上限报警灯②下限报警灯显示窗显示内容:上排四位数码管显示瞬时流量值下排八位数码管显示累积流量值(二)操作键说明SET-参数设定键,按下此键盘,可按次序输入参数,修改完毕一个参数请按SET键存贮并进入下一个参数值的修改。▲—在设定状态时,用于增加设定值。▼—在设定状态时,用于减少设定值。若按下▲或▼不动,数值将快速增减,松手后停止。CLR-清零键,按下此键,上排出现-CL-,下排显示1230,用▲和▼键把1230设成1234后,再按SET键,则完成累积量清零,输入其它值无效。SEL-选择键,工作状态下,选择显示瞬时流量、压力或温度,或分时巡回显示流量、压力和温度值,同时相应的指示灯亮。在设定参数时,选择键用作选择小数点的位数,范围从0~3。(三)上电自检⑴按仪表的端子接线图连接好仪表的电源、输入、输出、报警等接线。⑵仔细检查仪表的接线,正确无误后方可打开电源。⑶接通电源后仪表上排显示HELO下排显示PASS字样表示仪表自检通过,如果显示-HH-表示超量限或断偶及热阻开路,仪表采用人机对话形式来输入参数,用各种提示符来提示应输入的数据。3(四)参数设定按下SET键,上排数码管出现-cd-,下排数码管出现1230,用▲和▼键把1230设成1234后,再按SET键,才进入参数修改循环圈,输入其他值无效,这主要是为了防止非技术人员误修改参数。设定状态下,下排数码管显示功能提示符,下排显示给定值:工作状态下,上排显示瞬时流量值,下排显示累积流量值。Ⅰ、流量信号为电压电流输入时,操作顺序如下:(1)AA:补偿模式,范围0-3。0—测量液体、天然气等;1—测量饱和蒸汽;2—测量过热蒸汽;3—干燥气体。(详见流量算法表)附流量算法及密度表:饱和蒸汽密度表(单位:密度-ρ=Kg/m³;压力-P=MPa;温度-t=℃)温度(t)℃024压力P密度ρ压力P密度ρ压力P密度ρ1001101201301401501601701801902002102202302400.10130.14330.19850.27010.36140.47600.61810.79201.00271.25511.55481.90772.31982.79753.34770.59770.82651.1221.4971.9672.5483.2604.1235.1606.3977.8649.59311.6214.0016.760.10880.15320.21140.28670.38230.50210.65020.83101.04961.31111.62101.98522.40982.90103.46700.63880.87981.1901.5832.0732.6793.4204.3165.3916.6718.1889.97412.0714.5217.370.11670.16360.22500.30410.40420.52920.68350.87161.09831.36901.68922.06502.50263.00853.58970.69520.93591.2611.6722.1852.8163.5864.5155.6296.9558.52210.3712.5315.0517.994续表温度(t)℃68压力P密度ρ压力P密度ρ1001101201301401501601701801902002102202302400.12500.17460.23930.32220.42710.55770.71830.91371.14871.42891.75972.14742.59813.11853.71550.72770.99481.3361.7662.3012.9583.7584.7235.8777.2488.86810.7713.0015.6118.640.13390.18630.25430.34140.45100.58720.75440.95731.20101.49091.83262.23232.69633.23163.84480.77581.0571.4151.8642.4223.1063.9374.9376.3127.5519.22511.1913.4916.1819.305过热蒸汽密度表(单位:ρ=Kg/m³)PMPat℃1501902302703103500.100.150.200.250.300.400.500.801.101.401.702.002.503.003.504.004.505.006.007.000.51640.77811.04231.30891.57832.12372.66584.39666.13137.87859.846411.629515.189018.416822.700827.16430.385235.424343.895456.72010.47070.70790.94661.18691.42871.91662.41213.93725.53427.15409.247310.567613.715016.724320.442724.330327.447531.834239.598850.67800.43230.65..0.86841.08491.30791.75132.19923.56554.97196.42887.93529.505412.240615.036718.226621.495424.509628.243335.302044.63520.40010.60100.80271.00481.20771.61522.02553.27184.54455.84377.17138.535010.879413.337715.924318.660321.571724.653231.006238.59220.37240.55940.74650.93431.12241.50001.88023.02834.19435.37946.58157.80619.888811.997914.256516.552718.933321.422126.709132.54880.34840.52300.69800.87321.04881.40101.75452.82273.90304.99456.09987.21869.113911.049413.028615.053917.127919.262723.700628.40376续表PMPat℃3904304705105505900.100.150.200.250.300.400.500.801.101.401.702.002.503.003.504.004.505.006.007.000.32720.49120.65530.81980.98451.31441.64562.64403.65124.66735.69366.72608.475010.249312.052813.886215.752717.656521.562925.63300.30860.46310.61780.77260.92771.23771.54982.48843.43354.38575.34416.30907.93329.577511.242512.999114.667916.371919.906223.40210.29190.43810.58420.73160.88561.17081.46482.35003.24024.34965.03745.94197.46328.999110.551212.183513.700915.301718.549521.86750.27690.41560.55410.69250.83201.11021.38882.22743.06903.91574.76655.62047.05158.49459.949911.416912.895014.385917.402920.46990.26340.39530.52710.65910.79131.05561.32042.11642.91503.71834.52305.33226.68588.04869.419710.800312.189413.588516.411919.27450.25120.37680.50260.62840.75401.00621.25852.01682.77743.54014.30565.07456.35827.64988.948010.253311.565012.885015.544018.23147(2)L-Sn:设置流量输入信号,4-20mA、0-10mA、0-20mA、1-5V、0-5V可选。注:输入信号选择对照表(3)KF:开平方运算设置开关,选择on,输入信号与显示值成开方关系,选择OFF,输入信号与显示值成线性关系,提示符on和oFF用▲或▼键来改变,并按SET键确认。(4)tb:温度补偿设置开关,先择on,需要温度补偿,选择oFF,不需要温度补偿。注:如果用户已选择on,即需要温度补偿,而温度传感器或变送器实际未接,则仪表自动按不需要温度补偿处理,同时温度指示灯闪烁告知。(5)Pb:压力补偿设置开关,选择on,需要压力补偿,选择oFF,不需要压力补偿。注:如果用户已选择on,即需要压力补偿,而压力传感器或变送器实际未接,则仪表自动按不需要压力补偿处理,同时压力指示灯闪烁告知。(6)in-c:小信号切除设定,设定范围为0~5,表示小信号切除点为信号量程的0~5%,出厂值为1%。(7)n-累积量显示