振动限位开关 LVL-M2C
来源：未知 日期：2017/08/29 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 liquids
● Corrosion resistant coating (HALAR): ideally suited for the process
● Large selection of process connections: universal use
● Wide variety of electronic modules (e. g., relay, thyristor signal output): the right connection for every process control system
● No calibration: quick and low-cost start up
● No mechanically moving parts: maintenance-free, no wear, long operating life
● Monitoring of the vibrating fork for damage: guaranteed function
● PROFIBUS PA protocol: commissioning and maintenance quick and easy
● Up to SIL 2 acc. to IEC 61508
| 一般特性： | ||
|---|---|---|
| Function principle |
limit detection Maximum or minimum detection in tanks or pipelines containing all types of liquids including use in explosion hazardous areas. Particularly suited to very aggressive liquids thanks to high degree of corrosion protection. |
|
| Measuring method |
The forks of the sensors vibrate at their intrinsic frequency. This frequency is reduced when covered with liquid. The change in frequency then activates the limit switch. |
|
| Construction type | device with extension tube, coated with ECTFE | |
| Supply： | ||
| Rated voltage |
electronic insert FEL50A (PA): 9 ... 32 V DC electronic insert FEL51 (AC): 253 V AC, 50/60 Hz electronic insert FEL52 (E5): 10 ... 55 V DC electronic insert FEL54 (WA): 19 ... 253 V AC, 50/60 Hz or 19 ... 55 V DC electronic insert FEL55 (SI): 11 ... 36 V DC, PLC electronic insert FEL56 (N1), FEL58 (N2): isolating amplifier acc. to EN 60947-5-6 (NAMUR) |
|
| Current consumption | electronic insert FEL52 (E5): max. 15 mA | |
| 电气特性： | ||
| Surge protection | electronic insert FEL51 (AC), electronic insert FEL52 (E5), electronic insert FEL54 (WA), electronic insert FEL55 (SI): overvoltage category III | |
| 输入： | ||
| Switching point | see section switch point | |
| Measured variable | limit level (limit value) | |
| Measurement range | depends on mounting point and pipe extension up to 3000 mm , larger sizes on request | |
| 输出： | ||
| Switching delay |
when fork is covered: approx. 0.5 s, when fork is exposed: approx. 1.0 s (other switching times on request) additionally configurable for PROFIBUS PA (electronic insert FEL50A (PA)): 0.5 ... 60 s |
|
| Switch behaviour |
switch-over for minimum/maximum residual current safety on electronic insert MAX = maximum safety: The output switches to the power fail response when the fork is covered. for use with overspill protection for example MIN = minimum safety: The output switches to the power fail response when the fork is exposed. for use with dry running protection for example When switching on the power supply the output assumes the alarm signal. After max. 2 s it assumes the correct switching mode. |
|
| 符合： | ||
| Electromagnetic compatibility | NE 21 | |
| Degree of protection | IEC 60529 | |
| Vibration resistance | EN 60068-2-6 | |
| Climate class | DIN EN 60068-2-38/IEC 68-2-38 | |
| 测量精度： | ||
| Reference operating conditions |
ambient temperature: 23 °C (73.4 °F), medium temperature: 23 °C (73.4 °F), product density: 1 g/cm3 (water), viscosity: 1 mm2/s, medium pressure pe: 0 bar, sensor mounting: vertical from above, density switch: to > 0.7 g/cm3 |
|
| Maximum measured error | max. ± 1 mm, specified by mounting position | |
| Non-repeatability | 0.1 mm | |
| Hysteresis | approx. 2 mm | |
| Influence of medium density | max. +4.8 ... -3.5 mm (0.5 ... 1.5 g/cm3) | |
| Influence of medium temperature | max. 1.4 ... -2.8 mm (-40 ... 120 °C (-40 ... 248 °F)) | |
| Influence of medium pressure | max. 0 ... -2 mm (0 ... 40 bar) | |
| 操作条件： | ||
| Installation conditions | ||
| Installation position | with short pipe (up to 500 mm (19.7 inch)) any position, with long pipe vertical | |
| Process conditions | ||
| Medium temperature | -50 ... 150 °C (-58 ... 302 °F) , exceptions see process connections | |
| Medium pressure | pe = -1 ... 40 bar (-14.5 ... 580.2 psi) over the entire temperature range , exceptions see process connections | |
| Test pressure | max. 100 bar (1.5 times the medium pressure pe), no function during test pressure, burst pressure of diaphragm 200 bar | |
| Pressure surge | max. 20 bar/s | |
| Thermal shock resistance | max. 120 °C/s | |
| State of aggregation | liquid | |
| Density | min. 0.5 g/cm3 , other density settings on request | |
| Viscosity | max. 10000 mm2/s | |
| Solid contents | < ∅5 mm | |
| 周围环境： | ||
| Ambient temperature |
-50 ... 70 °C (-58 ... 158 °F) , function with reduced data values see section ambient temperature |
|
| Storage temperature | -50 ... 80 °C (-58 ... 176 °F) | |
| Vibration resistance | 10 ... 50 Hz, 0.15 mm, 100 cycles | |
| 机械特性： | ||
| Degree of protection | polyester, steel, and aluminum housing: IP66/IP67 | |
| Connection |
electronic inserts: cross section max. 2.5 mm2, lace in end splice in acc. with DIN 46228 ground lead in housing: cross section max. 2.5 mm2 external equipotential bonding: cross section 4 mm2 |
|
| Material |
wetted parts: - process connection and extension pipe: 1.4435/316L with ECTFE coating - vibration fork: 1.4435/316L with ECTFE coating housings: - polyester housing: PBT-FR with PBT-FR cover or with PA12 cover with sight glass, cover seal: EPDM - stainless steel housing: 1.4301/304, cover seal: silicone - aluminum housing: EN-AC-AlSi10Mg, plastic-coated, cover seal: EPDM cable gland: polyamide or brass, nickel-plated temperature spacer: 1.4435/316L flameproof bushing: 1.4435/316L |
|
| Surface quality | Ra < 3.2 µm | |
| Mass |
800 g , basic weight: compact version (length type II), electronic insert, plastic housing, without flange, additional weight is dependent on extension tube, housing and process connection process connections: - A3H 1000 g, A5H 1500 g, A6H 2400 g, A6I 3200 g, A8H 4900 g - H35 1400 g, H65 2400 g, H71 1600 g, H75 3200 g, H95 5900 g, HA3 5600 g - J1H 1700 g extension tube, temperature spacer, flameproof bushing: - BK* 900 g/m - CK* 2300 g/100 in - DKA 100 g, DKB 700 g, DKC 800 g |
|
| Dimensions |
housing: diameter max. 85 mm, height max. 173 mm temperature separator, flameproof bushing: additional length L 140 mm process connection: length L min. 115 mm extension: any length L from 148 ... 3000 mm, larger sizes on request extension: length type II, for vertical installation from above same switching point as Vibracon LVL2 vibration fork: width 20.6 mm, fork width 6.5 mm, length 25 mm |
|
| Process connection |
flanges to EN 1092-1 from DN25, to ANSI B 16.5 from 1 inch, to JIS B 2238 (RF) from DN50 For further information see type code. |
|
| 与危险区域有关的应用数据： | ||
| EU-Type Examination Certificate | see instruction manuals (SI) | |
| 国际认证： | ||
| FM approval | see control drawings (ZD) | |
| CSA approval | see control drawings (ZD) | |
| IECEx approval | see instruction manuals (SI) | |
| 许可和认证： | ||
| SIL classification | up to SIL2 acc. to IEC 61508 | |
| Overspill protection | see approval (ZE) | |
| 附件： | ||
| Designation | see technical information (TI) | |
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