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1、COMAX II V1.2K 激光液位计目录I. 系统概述.5II. 安装简述10III. 安装前期准备11IV. 设备安装17V. 定位18VI. 标定24VII. 系统输出标定28VIII. 设定液位计反应速度29IX. 改变液位计反应速度32X. 附加细目33XI. 技术支持33XII. 故障诊断维护34XIII. 光束与索引脉冲的关系37XIV. 原理图与电路板细节40修正版本 4 5/12/2004COMAX II LASER LEVEL GAUGECOMAX II 激光液位计Section I. THE SYSTEM部分 1 系统The gauge is comprised of
2、a water cooled 5mw (max.) helium-neon laser assembly operating in the 632.8 nm waveband, a water cooled receiver assembly, and a wall mounted electronics enclosure. Readouts and user outputs are provided at the electronics enclosure.液位计由一个5mw(最大) 水冷工作波段为632.8nm的氦-氖激光部件,一个水冷的接收部件以及电气控制柜组成.读出器和用户输出都是由
3、控制柜接出.The laser and receiver assemblies, mounted on adjustable bases, are mounted on rigid structures supplied by the customer.激光发射和接收部件安装在可调的基座上,而基座则由用户自己固定在强度结构上.A. SYSTEM OPERATIONA. 系统操作In operation, the laser beam is reflected from the process material surface to a parabolic mirror in the recei
4、ver assembly. The parabolic mirror focuses the beam onto a flat, first surface scanning mirror mounted on the shaft of a precision scanning motor. The scanning mirror sweeps the beam across an optical filter and photo diode detector assembly, producing the beam pulse.在运行时,激光光束从过程物质表面反射到接收部件的抛物柱面镜上.抛
5、物柱面镜将光束聚焦到一个平面上,第一表面扫描镜固定在精密扫描电机的轴上.扫描镜将光束扫过光学滤波器和图像二极管检测部件,产生光束脉冲.In addition to the scanning mirror, the motor shaft also carries a slotted disc. The slotted disc rotates through a LED/photo detector caliper that generates an index pulse with every revolution of the motor as shown in Figure 1. The
6、 index pulse is the constant to which the beam pulse is referenced to obtain a process level measurement.除了扫描镜之外,电机轴还带动一个槽盘.电机的每一转都会带动槽盘从LED和图像测量器之间穿过从而产生指数脉冲,如图1所示.对于获取液面测量数据的光束脉冲来说,指数脉冲是一个常量.The working relationship between the index pulse and the beam pulse is timing. A change in the process leve
7、l causes the laser beam to be reflected to a point that is higher or lower than its initial position on the parabolic mirror inside the receiver assembly. This causes the laser beam to be swept across the photo detector assembly either earlier or later in relation to the index pulse depending upon w
8、hether the process level lowered or raised.A rise in the measured surface level causes the beam pulse to occur later in relation to the start of the index pulse. A lowering of the measured surface causes the beam pulse to occur sooner in relation to the start of the index pulse.指数脉冲和光束脉冲之间的关系就是时间上的早
9、晚.过程液位的变化导致激光光束反射到接收部件里抛物柱面镜上的位置比原先的更高或者更低.这就导致激光光束相比于指数脉冲更早或更晚扫过图像测量器,这些取决于过程液位的下降或上升.被测液面的上升引起光束脉冲比指数脉冲晚产生.被测液面的下降引起光束脉冲比指数脉冲更早产生.At the leading edge of the index pulse, clock pulses from the CPU are injected and counted until the trailing edge of the index pulse occurs, producing the index count.
10、 The beam count is generated in a similar manner.However, the count is started at the middle of the beam pulse and is halted at the end of the index pulse.在 指 数 脉 冲 的 上 升 沿 ,CPU产 生 时 钟 脉 冲 并 计 数 到 指 数 脉 冲 的 下 降 沿 ,从 而 得 出 指 数计 数 .光 束 计 数 以 相 似 的 方 法 产 生 .不 过 ,计 数 是 从 光 束 脉 冲 的 中 间 开 始 并 以 指 数 脉冲 的 结
11、 束 而 停 止 .The beam and index counts are then stored in the on-board computer. After the trailing edge of the index pulse,all counters are reset in preparation of the next revolution of the scanner disc.光束与指数计数被存储在计算机中.在指数脉冲的下降沿,所有的计数器都复位,为扫描盘的下一转做准备.The Comax II Laser Level Gauge Complete SystemCOMA
12、X II 激光液位计完整系统The Comax II Laser Level Gauge Complete Systems Includes:COMAX II 激光液位计完整系统包括:An Electronics Enclosure一个电气控制柜A Step Down Transformer Assembly (for systems requiring 220VAC)一个步进变压器(系统要求220V AC)An Accessories Box, which contains the 45 Angle Plates, Jo-Posts,Keys, Laser Fuse, Installatio
13、n Kit and the User Manual一个附件箱,包括: 45 角盘, Jo- Posts,钥匙,激光保险丝,安装工具和用户手册.Complete Laser Assembly, which includes an Adjustable Base, Water-Jacket, Purge Assembly and the Laser Electronics完整的激光发射部件包括:一个可调节的基座 ,水包,清洁部件和激光电气部件.Complete Receiver Assembly, which includes an Adjustable Base, Water-Jacket, P
14、urge Assembly and the Receiver Electronics完整的接收部件包括:一个可调节的基座,水包,清洁部件和接收电气部件 .The difference between the stored index and beam counts produces the numeric value that represents the measured process level. The level indication is then sent to the digital display on the front panel of the electronics e
15、nclosure and to the output card inside the electronics enclosure.指数计数与光束计数之间的数值差异显示出要测量的过程液位.液位的显示数值被送到控制柜的前面板进行数字显示,并送入到控制柜的输出卡上.The output card generates the following analog outputs over the full range of operation (+/-0.500 inches or +/-8mm)A) -5VDC to +5VDCB) 0V to +10VDCC) 4mA to 20mADCThese outputs are available for customer use as process co
