振动限位开关 LVL-M1
来源：未知 日期：2017/08/08 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。
该功能不受流量、湍流、气泡的影响，泡沫，振动，散装固体耳鼻喉科或建立，设备是从而成为浮式开关的理想替代品。
高耐蚀合金C4（2.4610）可供非常适用的振动叉和工艺连接腐蚀性液体。保护EEx ia和EEx d设备可供使用爆炸危险区。
产品特点：● Limit switch for liquids
● 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 | compact device | |
| 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 | |
| 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 ... 150 °C (-40 ... 302 °F)) | |
| Influence of medium pressure | max. 0 ... -2.5 mm (-1 ... 64 bar) | |
| 操作条件： | ||
| Installation conditions | ||
| Installation position | any position | |
| Process conditions | ||
| Medium temperature | -50 ... 150 °C (-58 ... 302 °F) , exceptions see process connections | |
| Medium pressure | pe = -1 ... 64 bar (-14.5 ... 928.3 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 | |
| Thermal shock resistance | max. 120 °C/s (max. 120 K/s) | |
| State of aggregation | liquid | |
| Density | min. 0.5 g/cm3 (compact housing 0.7 g/cm3), other density settings on request | |
| Viscosity | max. 10000 mm2/s (max. 10000 cSt) | |
| 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 compact housing: - IP65 with valve connector PG11 or 1/2NPT - IP66/IP68 with M12 x 1 connector without LEDs (1.4435/316L) - IP69K with M12 x 1 connector with LEDs (1.4435/316L) |
|
| 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: 1.4435/316L or 2.4610/Alloy C4 - vibration fork: 1.4435/316L or 2.4610/Alloy C4 - flat seal for process connection G2* or G3*: elastomer fibre, asbestos-free housings: - polyester housing: PBT-FR with PBT-FR cover or with PA12 cover with sight glass, cover seal: EPDM - stainless steel housing: 1.4435/316L, cover seal: silicone - aluminum housing: EN-AC-AlSi10Mg, plastic-coated, cover seal: EPDM - compact housing with valve connector or M12 connector: 1.4435/316L cable gland: polyamide or brass, nickel-plated temperature spacer: 1.4435/316L flameproof bushing: 1.4435/316L |
|
| Surface quality | Ra < 3.2 µm/80 grit: length, spacer, bushings *A, *B, *E | |
| Mass |
600 g , basic weight: compact sensor, electronic insert, stainless steel housing, process connection G2*, additional weight is dependent on housing and process connection process connections: - A31 1000 g, A41 1200 g, A51 1500 g, A6* 2400 g, A81 4900 g, A91 7000 g - C45 1400 g, C51 1200 g, C71 1600 g, C75 3200 g, C95 5900 g, CA3 5600 g - D45 1400 g, D51 1200 g, D71 1600 g, D75 3200 g, D95 5900 g, DA3 5600 g - F45 1400 g, F51 1200 g, F55 2000 g, F61 1400 g, F65 2400 g, F71 1600 g, F75 3200 g, F7F 2600 g, F81 2400 g, F85 4300 g, F93 4800 g, F95 5900 g, FA3 5600 g, FA5 7500 g - G3* 200 g - J13 no information, J16 no information, J17 1700 g, J19 no information, J1A no information, J1C 1700 g - N3* 200 g, N75 2900 g - R3* 200 g - T51 no information, T61 100 g temperature spacer, flameproof bushing: - IA 600 g, QA 700 g |
|
| Dimensions |
housing: diameter max. 85 mm, height max. 173 mm temperature separator, flameproof bushing: additional length L 140 mm process connection: length L 66.5 ... 80 mm extension: length type II, for vertical installation from above same switching point as Vibracon LVL1, LVL2 vibration fork: width 17.5 mm, fork width 10 mm, length 25 mm |
|
| Process connection |
- cylindrical thread G3/4A, G1A to DIN ISO 228/1 with flat seal to DIN 7603 - conical thread R3/4, R1 to DIN 2999, part 1 - conical thread 3/4NPT, 1NPT to ANSI B 1.20.1 - flush-mounted with welding sleeve to factory standard (G3/4A, G1A) - Triclamp 1-1/2 inch, 2 inch to ISO 2852 - flanges to EN 1092-1 from DN25, to ANSI B 16.5 from 1 inch, to JIS B 2238 (RF) from DN25 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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