LGC2

Pepperl+Fuchs LGC2 Level probe.

Technical specifications

• 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.
• Construction type: device with rod probe
• 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
• Power consumption: level probe and Pt100 (optional):; - ≤ 0.805 W at 35 V DC (non-hazardous area); - ≤ 0.690 W at 30 V DC (hazardous area); temperature head transmitter (optional): ≤ 0.875 W at 35 V DC
• 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
• Measuring 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)
• Load: level probe and Pt100 (optional): RLmax ≤ (U - 10.5 V)/0.023 A - 2 x 0.09 Ω/m x l - Radd; temperature head transmitter (optional): RLmax ≤ (U - 8 V)/0.025 A - Radd; - RLmax = max. load resistance [Ω]; - Radd = additional resistances such as resistance of evaluating device and/or display instrument, line resistance [Ω]; - U = supply voltage [V]
• 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
• Resolution: current output: 1 µA
• 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
• Response time: level probe: 400 ms (T90 time), 500 ms (T99 time); Pt100 (optional): 160 s (T90 time), 300 s (T99 time)
• 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)
• 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)
• 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