液位探针 LGC2
来源：未知 日期：2017/07/20 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。
液位传感器可以检测到当前浸入的高度。它通过介质表面与预设参考高度的差值来测量实现。连续液位测量带有使用率评估，漏液控制及精确流程控制(VDI/VDE Directive 3519)的功能
随着液位的升高液体的压力增加。这样静压通过一个不锈钢薄膜被传送给测量单元。泡沫、结块、液体的电气波动特性和容器形状对不影响测量值。
如果密度已知，液体的液位可以由静压来决定。压电式负荷单元通过一个不锈钢绝缘薄膜和一个膜片密封被连接到测量液体中。 测量单元的输出信号由信号调节器转换成：4mA…20mA模拟量信号或脉宽调制电流信号（PLM）.
水平探头是一种用于测量的静水压力传感器。水平。这些设备的一个突出特点是机械和电气耐久性。嵌入式电子、重型圆锥电缆密封和2-filter制度保证一个完美的密封抵抗任何气候条件。
具有长期精度的高精度陶瓷测量单元稳定可靠的安全灌装级别测量。
产品特点：● Device for hydrostatic pressure measurement in liquids
● High resistance to overload
● High-precision, robust ceramic measuring cell with long-term stability
● Simultaneous level and temperature measuring by optional integrated Pt100 resistance thermometer
● Measuring ranges: 0 bar ... 0.1 bar to 0 bar ... 20 bar
● Electronics comprising 4 mA ... 20 mA output signal and integrated overvoltage protection
● KTW and NSF drinking water approval
| 一般特性： | ||
|---|---|---|
| Measuring method |
Level control with ceramic measuring cell (dry measuring cell). The pressure acts directly on the rugged ceramic membrane of the device and causes it to move by about max. 0.005 mm. The effects of air pressure on the liquid surface are transferred via a pressure compensating tube through the extension cable to the rear of the ceramic membrane and compensated. Pressure-dependent changes in capacitance caused by membrane movement are measured at the electrodes of the ceramic carrier. The electronics convert the movement into a pressure-proportional signal which is linear to the medium level. |
|
| Equipment architecture | As standard, the complete measuring system consists of a level probe and a transmitter power supply unit with a supply voltage of 10.5 to 30 V DC. | |
| Construction type | device with rod probe | |
| Supply： | ||
| Rated voltage |
level probe and Pt100 (optional): - 10.5 ... 35 V DC (non-hazardous area) - 10.5 ... 30 V DC (hazardous area) temperature head transmitter (optional): 8 ... 35 V DC |
|
| Current consumption |
level probe and Pt100 (optional): max. ≤ 23 mA, min. ≥ 3.6 mA temperature head transmitter (optional): max. ≤ 25 mA, min. ≥ 3.5 mA |
|
| Reverse polarity protection | Reverse voltage protection is integrated in the level probe and in the temperature head transmitter changing the polarities has no impact on operation. | |
| Residual ripple |
level probe and Pt100 (optional): No impact on the 4 to 20 mA signal up to ±5 % residual ripple within the permitted voltage range. temperature head transmitter (optional): Uss ≥ 5 V at U ≥ 13 V, fmax. = 1 kHz |
|
| 电气特性： | ||
| Surge protection |
level probe and Pt100 (optional): - integrated overvoltage protection acc. to EN 61000-4-5 (500 V symmetrical/1000 V asymmetrical) - overvoltage protection ≥ 1.0 kV, external if necessary temperature head transmitter (optional): provide overvoltage protection, externally if necessary |
|
| 输入： | ||
| Input signal |
level probe: change in capacitance Pt100 (optional): change in resistance temperature head transmitter (optional): Pt100 resistance signal, 4-wire |
|
| Measured variable |
level probe: hydrostatic pressure of a liquid Pt100 (optional): temperature temperature head transmitter (optional): temperature |
|
| Measurement range |
level probe: - predefined pressure measuring ranges in bar, see type code - customer-specific measuring ranges, factory-calibrated Pt100 (optional): temperature measurement from -10 ... 70 °C (+14 ... +158 °F) |
|
| 输出： | ||
| Output signal |
level probe: 4 ... 20 mA, 2-wire for hydrostatic pressure measured value Pt100 (optional): temperature-dependent resistance value temperature head transmitter (optional): 4 ... 20 mA Analog for temperature measured value, 2-wire |
|
| Signal range | 3.8 ... 20.5 mA | |
| 指令符合： | ||
| Electromagnetic compatibility | ||
| Directive 2014/30/EU | EN 61326-1:2013 , EN 61326-2-3:2013 | |
| Low voltage | ||
| Directive 2014/35/EU | EN 61010-1:2010 | |
| 符合： | ||
| Degree of protection | IEC 60529:2001 | |
| 测量精度： | ||
| Resolution | current output: 1 µA | |
| Reference operating conditions |
level probe and Pt100 (optional): acc. to IEC 60770, Tamb = constant in the range: +21 ... +33 °C (+70 ... +91 °F) temperature head transmitter (optional): calibration temperature 23 °C (+73 °F) ± 5 K |
|
| Accuracy |
level probe and Pt100 (optional): The reference accuracy comprises the non-linearity after limit point configuration, hysteresis and non-reproducibility in accordance IEC 60770. - standard version ±0.2 % - platinum version ±0.1 % temperature head transmitter (optional): ± 0.2 K, with Pt100: max. ± 0.9 K |
|
| Long-term drift |
level probe and Pt100 (optional): - ≤ 0.1 % of URL/year - ≤ 0.25 % of URL/5 years temperature head transmitter (optional): ≤ 0.1 K per year |
|
| Influence of medium temperature |
thermal change in the zero output and the output span: - 0 ... +30 °C (+32 ... +86 °F): < (0.15 + 0.15 x TD) % of set span - -10 ... +70 °C (+14 ... +158 °F): < (0.4 + 0.4 x TD) % of set span temperature coefficient (TK) of the zero output and the output span: -10 ... +70 °C (+14 ... +158 °F): 0.1 %/10 K of URL |
|
| Warm-up time |
level probe: < 6 s Pt100 (optional): 20 m temperature head transmitter (optional): 4 s |
|
| Response time |
level probe: 400 ms (T90 time), 500 ms (T99 time) Pt100 (optional): 160 s (T90 time), 300 s (T99 time) |
|
| 操作条件： | ||
| Installation conditions | ||
| Installation position | vertical from above | |
| Process conditions | ||
| Medium temperature |
level probe and Pt100 (optional): - Ø22 mm and Ø42 mm: -10 ... +70 °C (+14 ... +158 °F) - Ø29 mm: 0 ... +50 °C (+32 ... +122 °F) temperature head transmitter (optional): -40 ... +85 °C (-40 ... +185 °F) (= ambient temperature), install temperature head transmitter outside the medium. |
|
| Medium temperature limits |
level probe and Pt100 (optional): - Ø22 mm and Ø42 mm: -20 ... +70 °C (-4 ... +158 °F) - Ø29 mm: 0 ... +50 °C (+32 ... +122 °F) |
|
| 周围环境： | ||
| Ambient temperature |
level probe and Pt100 (optional): - Ø22 mm and Ø42 mm: -10 ... +70 °C (+14 ... +158 °F) (= medium temperature) - Ø29 mm: 0 ... +50 °C (+32 ... +122 °F) (= medium temperature) temperature head transmitter (optional): -40 ... +85 °C (-40 ... +185 °F) |
|
| Storage temperature |
level probe and Pt100 (optional): -40 ... +80 °C (-40 ... +176 °F) temperature head transmitter (optional): -40 ... +85 °C (-40 ... +185 °F) |
|
| 机械特性： | ||
| Degree of protection |
level probe and Pt100 (optional): IP68, permanently hermetically sealed, optional terminal box IP66/IP67 temperature head transmitter (optional): IP00, moisture condensation permissible, when mounted in the optional terminal box IP66/IP67 |
|
| Connection |
3 terminals in terminal box (accessory) as standard 4 terminals in terminal block (accessory), conductor cross section 0.08 ... 2.5 mm2 |
|
| Material |
level probe: 1.4435/316L process ceramic: Al2O3 (aluminium oxide ceramic) seal (internal): EPDM or Viton protection cap: POM or PFA terminal box: PC (polycarbonate) temperature head transmitter: housing PC (polycarbonate) probe connection insulation (extension cable): PE-LD (low-density polyethylene) or FEP (fluorinated ethylene propylene) pressure compensation tube: PA |
|
| Cable |
level probe and Pt100 (optional): - commercially available instrument cable - terminals of the terminal box: 0.08 ... 2.5 mm2 temperature head transmitter (optional): - commercially available instrument cable - terminals of the terminal box: 0.08 ... 2.5 mm2 - transmitter connection: max. 1.75 mm2 probe connection (extension cable): - total outer diameter: 8.0 mm ± 0.25 mm - level probe: 3 x 0.2 mm2 and pressure compensation tube with PTFE filter - Pt100 (optional): 7 x 0.2 mm2 and pressure compensation tube with PTFE filter - pressure compensation tube with PTFE filter: external diameter Ø2.5 mm, internal diameter Ø1.5 mm |
|
| Mass |
level probe Ø22 mm: 344 g level probe Ø42 mm: 1376 g level probe Ø29 mm: 394 g probe connection (extension cable) PE: 52 g/m probe connection (extension cable) FEP: 108 g/m suspension clamp: 170 g cable mounting screw G1-1/2: 770 g cable mounting screw N1-1/2: 724 g terminal box: 235 g temperature head transmitter: 40 g additional weight: 300 g testing adapter: 39 g |
|
| Mechanical load |
probe connection (extension cable): - minimum bending radius: 120 mm - tensile strength: max. 950 N - cable extraction force: ≥ 400 N - PE: for use in drinking water - UV-resistant - cable resistance per wire: ≤ 0.09 Ω/m |
|
| Dimensions |
level probe Ø22 mm: Ø22 x 259 mm level probe Ø42 mm: Ø42 x 247 mm level probe Ø29 mm: Ø29 x 268 mm probe connection (extension cable): Ø8 mm suspension clamp: Ø48 x 175 mm cable mounting screw G1-1/2: Ø55 x 71 mm cable mounting screw N1-1/2: Ø38 x 71 mm terminal box: 55 x 80x 120 mm temperature head transmitter: Ø44 x 21 mm additional weight: Ø22 x 110 mm testing adapter: 25 x 25 x 33 mm |
|
| 与危险区域有关的应用数据： | ||
| EU-Type Examination Certificate | TÜV 01 ATEX 1749 | |
| Marking |
 II 2G Ex ia IIC T6...T4 Gb |
|
| Certificate | PF 16 CERT 1658 X | |
| Marking |
II 3G Ex nA IIC T6...T4 Gc |
|
| Directive conformity | ||
| Directive 2014/34/EU | EN 60079-0:2012 , EN 60079-11:2012 , EN 60079-15:2010 | |
| 国际认证： | ||
| IECEx approval | ||
| IECEx certificate | Ex ia IIC T6...T4 Gb | |
| Standards | IEC 60079-0:2011 , IEC 60079-11:2009 | |
| 许可和认证： | ||
| Drinking water approval | KTW certificate and NSF approval | |
| 附件： | ||
| Optional accessories |
Pt100 resistance thermometer suspension clamp cable mounting screw G1-1/2 cable mounting screw N1-1/2 terminal box (IP66/IP67) additional weight testing adapter shortening kit for probe connection HUT temperature head transmitter, 2-wire, 4 ... 20 mA |
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尺寸图
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