电容式液位测量仪 LCL*
来源：未知 日期：2017/06/13 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。
绝缘层内探头尾部的金属片与金属容器壁组成了一个电容，电容随着介质液位的升高而变化。因此，对于电容式液位量程需要介质的介电常数是固定的。 简单坚固的结构（杆探头或索缆式探头）可以用于液体、粒状固体、导电和非导电介质的物位测量。
金属容器壁与测量传感器的电极杆组成了电容的两个电极。电容值随介质液位的升高而变化。
产品特点：● Complete unit consisting of the probe and electronic insert
● Integrated active build-up compensation: exact switch point, even with strong build-up
● Mechanically rugged: no wearing parts, long operating life, maintenance-free
● Rope probe can be shortened for optimum matching to the measuring point
● ATEX approval for zone 20 (dust)
| 应用： | ||
|---|---|---|
| Function principle |
Limit detection Maximum or minimum detection in silos with all types of solid granulates, even in dust explosion hazardous areas. |
|
| 功能与系统设计： | ||
| Measuring principle | A metal plate at the end of the probe, within the insulation, and the surroundings (e. g. the silo walls) combine to form the two electrodes of a capacitor. If the probe is covered or free of material, then the capacitance changes and the LCL switches. | |
| 输入特性： | ||
| Measured variable | limit level (limit value) | |
| Measurement range |
LCL1: dielectric constant ≥ 1.6 LCL2: dielectric constant ≥ 1.5 |
|
| 输出特性： | ||
| Output signal |
connection E5: switching PNP, Imax = 200 mA - overload and short circuit protection - residual voltage at transistor at Imax < 2.9 V connection WA: contact change-over, potential-free - Umax = 253 V - Imax = 4 A (AC) - Pmax = 1000 VA, cos φ = 1, Pmax = 500 VA, cos φ > 0.7 |
|
| 辅助能源： | ||
| Electrical connection | see section electrical connection | |
| Supply voltage |
electrical connection E5: 10.8 ... 45 V DC, short-term pulse on 55 V DC electrical connection WA: 20 ... 235 V AC, 50/60 Hz or 20 ... 55 V DC |
|
| Current consumption |
electrical connection E5: max. 30 mA, reverse-polarity-proof electrical connection WA: max. 130 mA |
|
| 测量精度： | ||
| Reference operating conditions |
vessel type: plastic vessel, ambient temperature: 73 °F (23 °C, 296 K), medium temperature: 73 °F (23 °C, 296 K) medium pressure pe: 0 bar, medium: dielectric constant = 2.6, conductivity: < 1 µS sensitivity setting: C |
|
| Hysteresis |
LCL1: horizontal 4 mm (0.16 inch), vertical 7 mm (0.28 inch) LCL2: vertical 5 mm (0.2 inch) |
|
| Long-term drift |
LCL1: horizontal 3 mm (0.12 inch), vertical 6 mm (0.24 inch) LCL2: vertical 6 mm (0.24 inch) |
|
| Influence of medium temperature | depending on the filling material | |
| 操作条件： | ||
| Installation conditions | ||
| Installation position |
LCL1: optional LCL2: vertically down Note the angle of the material mounds and the outlet funnel when determining the mounting point or probe length. The limit switch switches when the probe tip is covered by a few centimetres of material or when it is free material flow should not be directed at the probe. |
|
| Mounting location | The capacitive limit switch can be installed in silos made of different materials (e. g. metal, plastic, concrete). | |
| Ambient conditions | ||
| Ambient temperature |
-40 ... 70 °C (-40 ... 158 °F) (-40 ... 140 °F (-40 ... 60 °C, 233 ... 333 K), dust-Ex version) see section temperature ranges |
|
| Ambient temperature limits |
-40 ... 80 °C (-40 ... 176 °F) (-40 ... +140 °F (-40 ... +60 °C, 233 ... 333 K), Dust-Ex version) see section temperature ranges , grey background |
|
| Storage temperature | -40 ... 80 °C (-40 ... 176 °F) | |
| Shock resistance | probe: 7J | |
| Overvoltage protected | overvoltage category III | |
| Process conditions | ||
| Process temperature |
LCL1: -40 ... 120 °C (233 ... 393 K) (-40 ... 80 °C (233 ... 353 K), dust-Ex version) LCL2: -20 ... 70 °C (253 ... 343 K) see section temperature ranges |
|
| Process temperature limits |
LCL1: -40 ... 130 °C (233 ... 403 K) (-40 ... 80 °C (233 ... 353 K), dust-Ex version) LCL2: -40 ... 80 °C (233 ... 353 K) see section temperature ranges , grey background |
|
| Medium pressure limits |
LCL1: -1 ... 25 bar LCL2: -1 ... 6 bar |
|
| 机械特性： | ||
| Degree of protection | IP66 | |
| 机械结构： | ||
| Dimensions |
housing: LCL1 Ø94 x 140 mm (3.7 x 5.5 inch), LCL2 Ø94 x 145 mm (3.7 x 5.7 inch) process connections: see section dimensions probe: LCL1 length 140 mm (5.5 inch), LCL2 length 500 ... 6000 mm (1.7 ... 20 ft) |
|
| Mass |
LCL1: 560 g LCL2: 1230 g (basic weight for 500 mm probe length) |
|
| Material |
housing: PBT-FR with cover in PBT-FR or with transparent cover in PA12, seal of cover: EPDM cable gland: polyamide or brass, nickel-plated wetted parts: - rod probe: PPS Polyphenylenesulphide (glass fiber content 40 %) - rope probe: armoured steel with HD-PE coating - other probe components: PPS Polyphenylenesulphide (glass fiber content 40 %) |
|
| 许可和认证： | ||
| Explosion-hazardous area | LCL1: DMT 01 ATEX E 122, LCL2: KEMA 01 ATEX 1149 , for additional certificates see www.pepperl-fuchs.com | |
| Type of protection |
 II 1/3D IP66 T97°C (DMT 01 ATEX E122) II 1/3D [EEx ia] IIB T97°C (KEMA 01 ATEX 1149) |
|
| Overspill protection | LCL1: Z-65.13-313 (overspill protection in acc. with WHG) | |
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