振动限位开关 LVL-B1
来源：未知 日期：2017/07/20 浏览量：次
如今，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。倍加福可帮助用户解决特殊测量和控制问题，并且能够精确的检测任何介质的液位。
限位检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。
音叉液/料位测量仪的工作模式：两片音叉在使用中由压电器件振动。在空气中音叉有一个固定振动频率。当遇到液体时，音叉频率和振幅发生改变。电路检测到这些变化并产生开关信号。
在用有振动式限位开关测量限位时，将棒或音叉置于振动中。如果振动探头与介质发生接触，则振动会发生改变，振动式限位开关发出一个开关指令。将振动式限位开关作为溢流保护装置或空载报告器用于液体中以及颗粒状的或粉末状的固料中。
该装置是一个坚固的筒仓水平限位开关—粒或粗粒，非流态化固体。各种各样的设计意味着这个装置的范围很广。可在灰尘中使用易燃危险区。
典型的应用：谷物，咖啡豆，糖，动物饲料，大米，洗涤剂，染料粉、粉笔、石膏、水泥、砂、塑料颗粒。
产品特点：● Limit switch for bulk solids
● Compact device
● No calibration: easy commissioning (plug and play)
● Insensitive to build-up: maintenance-free operation
● No mechanically moving parts: no wear, long operating life
● Sensor material stainless steel: hardly any abrasion even with building materials
● Insensitive to external vibration and flow noises
| 一般特性： | ||
|---|---|---|
| Measuring method | A piezoelectric drive excites the vibrating rod of the device to its resonance frequency. If medium covers the vibrating rod, the rod's vibrating amplitude changes (the vibration is damped). The electronics of the device compare the actual amplitude with a target value and indicates whether the vibrating rod is vibrating freely or whether it is covered by medium. | |
| Equipment architecture |
The measuring system consists of: - the device with electronic insert - a supply point - the connected control systems, switching units, signalling systems (e. g. lamps, horns, PCS, PLC, etc.) |
|
| Construction type | compact device | |
| Operating mode |
MAX = maximum safety: The device switches if the probe is covered or if the supply voltage is disconnected in a safety-oriented manner (signal on alarm). example application: overspill protection MIN = minimum safety: The device switches if the probe is uncovered or if the supply voltage is disconnected in a safetyoriented manner (signal on alarm). example application: dry-running protection |
|
| Supply： | ||
| Rated voltage |
electronic insert FEM22 (E5): 10 ... 45 V DC electronic insert FEM24 (WA): 19 ... 253 V AC, 50/60 Hz or 19 ... 55 V DC |
|
| Ripple | electronic insert FEM22 (E5): max. 5 V, 0 ... 400 Hz | |
| Current consumption | electronic insert FEM22 (E5): max. 18 mA | |
| Reverse polarity protection | separation voltage 2.2 kV | |
| 电气特性： | ||
| Surge protection | electronic insert FEM22 (E5) : overvoltage category III | |
| 输入： | ||
| Input signal |
probe covered - small amplitude probe not covered - large amplitude |
|
| Measured variable | level (according to the mounting location and the overall length) | |
| Measurement range | The measuring range depends on the mounting location of the device | |
| 输出： | ||
| Output signal | digital | |
| 电流隔离： | ||
| Input/Other circuits | electronic insert FEM24 (WA) | |
| 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 | electronic insert FEM24 (WA) : EN 61010-1:2010 | |
| 符合： | ||
| Electromagnetic compatibility | NE 21 | |
| Degree of protection | IEC 60529:2001 | |
| Vibration resistance | EN 60068-2-27 | |
| Climate class | EN 60068, part 2-38, fig. 2a | |
| 测量精度： | ||
| Measuring frequency | 700 ... 800 Hz | |
| Switching time | when covering the sensor approx. 0.5 s, when uncovering the sensor approx. 1.0 s | |
| 操作条件： | ||
| Installation conditions | ||
| Installation position | see section mounting position | |
| Process conditions | ||
| Process temperature | -40 ... 150 °C (-40 ... 302 °F) | |
| Medium pressure limits |
-1 ... 25 bar max. working pressure 25 bar, burst pressure 100 bar |
|
| Thermal shock resistance | max. 120 K | |
| State of aggregation | solids | |
| Solid contents | ≤ ∅25 mm | |
| Bulk density | ≥ 200 g/l, not fluidised | |
| 周围环境： | ||
| Ambient temperature | -40 ... 70 °C (-40 ... 158 °F) | |
| Storage temperature | -40 ... 85 °C (-40 ... 185 °F) | |
| 机械特性： | ||
| Degree of protection | IP66/IP67, NEMA 4X | |
| Connection |
gland M20 thread G1/2, NPT1/2 |
|
| Material |
F16 housing: PTB-FR, cover with transparent glass made of PA12, EPDM cover seal F18 housing: aluminum EN-AC-AlSi10Mg, plastic coated cover seal: EPDM process connections, sensor: stainless steel 1.4435/316L |
|
| Mass | device with F16 housing, electronic insert FEM24 (WA) and R1 thread: approx. 1.0 kg | |
| Dimensions | max. ∅85 mm (3.3 inch), length 372 mm (14.6 inch) | |
| Process connection |
thread R1, R1-1/2 acc. to DIN 2999 thread 1-1/4 - 11-1/2 NPT, 1-1/2 - 11-1/2 NPT acc. to ANSI B 1.20.1 |
|
| 与危险区域有关的应用数据： | ||
| EC-Type Examination Certificate | KEMA 06 ATEX 0055 | |
| Group, category, type of protection |
 II 1/3D Ex ta/tc IIIC T170°C Da/Dc |
|
| Directive conformity | ||
| Directive 2014/34/EU | EN 60079-0:2012 , EN 60079-31:2009 | |
| 国际认证： | ||
| IECEx approval | IECEx DEK 11.0068 | |
| Approved for | Ex ta/tc IIIC T170°C Da/Dc | |
尺寸图
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