导电电平限位开关 LKL-P*
来源：未知 日期：2017/09/19 浏览量：次
液位测量技术是化学、化工、环境和相关行业中过程控制管理的基本技术。
限值监测开关在介质达到设定高度、超过设定值或者低于设定值的时候进行切换信号。设定值(VDI/VDE Directive 3519)基于安装高度。
导电液体的很普遍。一旦液体达到固定高度的电极时，液体使两个电极（或者容器与电极之间）之间的DC自由交变电流电路闭合，电流的突变产生一个开关信号。可以很好的检测酸、碱和水溶液。非抗腐蚀材质的探头不能检测强腐蚀性液体。易燃液位如燃料、汽油和溶剂是非导电的，不适用于该测量原理。
两个电极被安装在受检测的导电液体表面，当液位上升到一定位置两根电极接触到液体，导通的继电器通过两根电极和液体产生一个开关信号。液体最小导电率必须为10μS/cm。这些情况下除了纯溶剂外，必须是典型的导电液体，如水、酸和碱。 如果需要多个开关点，就用相关的多杆电极。为避免液体中的电气影响，被测电流用无直流信号的交流电，这由电极开关放大器或变换器产生。分界面液位检测用这种方法测量既经济又方便，特别是用于原油和汽油分界面，水和非导电液体分界面。
产品特点：● Level limit switch for conductive liquids
● Detect up to five level limits with one probe
● Flexible instrumentation
● No moving parts in the tank
● No calibration: quick and low-cost start up
● Option between rod or rope version for optimum adaptation to the application
● Two-point control and additional maximum and minimum detection
● Approval as overfill protection and leak detection system acc. to WHG
| 指令符合： | ||
|---|---|---|
| Electromagnetic compatibility | ||
| Directive 2014/30/EU | EN 61326-1:2006 , EN 61326-2-3:2006 | |
| Low voltage | ||
| Directive 2014/35/EU | EN 61010-1:2001 | |
| 符合： | ||
| Electromagnetic compatibility | NE 21 | |
| Degree of protection | IEC 60529:2001 | |
| Vibration resistance | EN 60068-2-64 | |
| Climate class | EN 60068, part 2-38 (test Z/AD) | |
| 功能与系统设计： | ||
| Measuring principle |
An alternating voltage exists between the probes in an empty tank. As soon as the conductive liquid in the tank creates a connection between the ground probe and, for example, the maximum probe, a measurable current flows and the device switches. With level limit detection, the device switches back as soon as the liquid clears the maximum probe. With two-point control, the device does not switch back until the max and min probe is cleared. Using alternating voltage prevents corrosion of the probes and electrolytic destruction of the product. The material used for the tank walls is not important for measurement because the system is designed as a closed potential-free circuit between the probes and the electronics. There is absolutely no danger if the probes are touched during operation. |
|
| Equipment architecture |
probe with integrated electronic insert (compact instrument version) probe without integrated electronic insert (separate instrument version) for one, two or multiple point detection respectively, see section measuring system |
|
| 输入特性： | ||
| Measured variable | resistance change between two conductors caused by the presence or absence of a conductive product. | |
| Measurement range |
The measuring range is dependent on the mounting location of the probes. Rod probes can have a max. length of 4000 mm (13 ft) and rope probes up to 15000 mm (49 ft). |
|
| 输出特性： | ||
| Output signal | see section electrical connection | |
| Measurement range | A total of four measuring ranges (100 Ω, 1 kΩ, 10 kΩ, 100 kΩ) can be set via two DIL switches (SENS). The setting on delivery is 100 kΩ. | |
| 辅助能源： | ||
| Electrical connection | see section electrical connection | |
| Supply voltage |
Output E5 (FEW52): supply voltage 10.8 ... 45 V DC load connection: open collector; PNP switching voltage: max. 45 V Output WA (FEW54): supply voltage 20 ... 55 V DC or 20 ... 253 V AC, 50/60 Hz peak inrush current: max. 2 A, max. 400 µs output: two potential-free change-over contacts output N1 (FEW58): refer to datasheet of the connected switch amplifier acc. to IEC 60947-5-6 (NAMUR) |
|
| Power consumption |
Output E5 (FEW52): P < 1.1 W output WA (FEW54): P < 2.0 W |
|
| Current consumption |
Output E5 (FEW52): I < 25 mA (without load) output WA (FEW54): 60 mA |
|
| 测量精度： | ||
| Reference operating conditions |
ambient temperature: 23 °C (296 K), medium temperature: 23 °C (296 K), medium viscosity: medium must release the probe again (drain off), medium pressure pe: 0 bar, probe installation: vertically from above |
|
| Maximum measured error |
± 10 % at 0.1 ... 100 kΩ ± 5 % at 1 ... 10 kΩ |
|
| Non-repeatability |
± 5 % at 0.1 ... 100 kΩ ± 1 % at 1 ... 10 kΩ |
|
| Hysteresis | -10 % for the max probe, in reference to the switch point, Δs function deactivated | |
| Influence of ambient temperature | < 0.05 %/K | |
| Switching time | < 3 s | |
| 操作条件： | ||
| Installation conditions | ||
| Mounting location | The rod and rope probes are mounted predominantly in tanks made of plastic or metal. | |
| Mounting examples | see section example applications | |
| Ambient conditions | ||
| Ambient temperature |
-40 ... 70 °C (-40 ... 158 °F) -40 ... 60 °C (233 ... 333 K) for output N1 (FEW58) |
|
| Storage temperature | -40 ... 80 °C (-40 ... 176 °F) | |
| Climate class | tropicalized | |
| Shock resistance | practical test | |
| Vibration resistance | 20 ... 2000 Hz, 1 (m/s2)2/Hz | |
| Process conditions | ||
| Medium temperature | -40 ... 100 °C (-40 ... 212 °F) | |
| Medium pressure | -1 ... 10 bar (-14.5 ... 145 psi) | |
| Conductivity | ≥ 10 µS | |
| 机械特性： | ||
| Degree of protection | IP66 | |
| 在危险区域连接的应用程序数据： | ||
| EC-Type Examination Certificate | TÜV 03 ATEX 2295 | |
| Group, category, type of protection |
 II 2G Ex ia/ib IIC T4 |
|
| Directive conformity | ||
| Directive 2014/34/EU | EN 60079-0:2009 , EN 60079-11:2007 | |
| 机械结构： | ||
| Dimensions |
LKL-P1: - housing: max. Ø85 mm (3.3 inch), height max. 145 mm (5.7 inch) - rod: length 100 ... 4000 mm (4 in ... 13 ft) LKL-P2: - housing: max. Ø85 mm (3.3 inch), height max. 145 mm (5.7 inch) - rope: length 250 ... 15000 mm (10 in ... 49 ft) |
|
| Mass |
separate instrument version: - rod, 1 m (3 ft) long, LKL-P1 with 2, 3 or 5 rods: 415 g, 530 g, 760 g - rope, 1 m (3 ft) long, LKL-P2 with 2, 3 or 5 ropes: 390 g, 470 g, 640 g compact instrument version: - rod, 1 m (3 ft) long, LKL-P1 with 2 or 3 rods (600 g/720 g) - rope, 1 m (3 ft) long, LKL-P2 with 2 or 3 ropes (710 g/800 g) |
|
| Material |
probes: - rods: rod 1.4404/316L, insulation: PP - ropes: rope 1.4571/316Ti, insulation FEP, weight 1.4435/316L housing: - output NA (separate instrument version): housing PPS, cover PBT - output E5/WA/N1 (compact instrument version): housing PBT, cover PBT, adapter PBT process connections: PPS |
|
| 许可和认证： | ||
| Overspill protection | see approval (ZE) | |
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