Capacitance Continuous Level Measurement Probes Model LV3000 and LV4000 Series
The LV3000/LV4000 Series continuous level measurement probes are flexible, cost-effective solutions for applications involving liquids, pastes, and some solids. The built-in (one-piece) electronic module provides a 4 to 20 mA output (2-wire) signal that is proportional to the process level. Zero and span adjustment helps account for various media, tank dimensions, rod lengths, and positions of installation.
OMEGA® offers these probes in several different models. The user must choose the probe that suits his or her application and install it in the proper location. When submerged, the probe must be able to produce enough capacitance variance. The probe’s success depends on these important factors:
A) Conductive materials can cause a short circuit between a bare stainless steel probe and the tank wall. For this situation, we recommend using ECTFE/ETFE sleeved coatings on the rod surface.
B) Material buildup affects the accuracy of RF capacitive measurements. Additional adjustment to the probe’s sensitivity is therefore recommended.
Housings must be compatible with the requirements for hazardous, washdown, wet, or dusty environments. For explosion-proof environments, the housing may need to be certified. In addition, the active probe might need to be intrinsically safe or have an intrinsic safety barrier.
The electronic circuitry of the probe performs several functions, such as rectifying and filtering the incoming power, generating the radio frequency signal, and measuring the changes in current flow.
SPECIFICATIONS (LV3000 SERIES)
Accuracy: 0.5%
Repeatability: ±1 mm
Level Indication: Bar graph, 0 to 1000%
Process Connection: ¾ to 1½ NPT, tri-clamp or flange
Wetted Material: 316 SS or PTFE
Enclosure Material: Aluminum die cast
Max Pressure: 290 psi (20 bar)
Operating Temperature: -10 to 120°C (14 to 248°F)
Class Protection:
LV3000: NEMA 4 (IP65)
LVCN410: IP40
Max Probe Length: 1.8 m (6')
Dimensions:
Aluminum Die-Cast Head: 89 W x 108 mm H (3.5 x 4¼")
Diameter of Probe: 16 mm (5/8")
Electrical Connection: Cable gland with ½ NPT conduit
Note: The LV3000 Series probes require a LVCN400 Series controller.
SPECIFICATIONS (LV4000 SERIES)
Accuracy: 0.5%
Repeatability: ±1 mm
Operating Voltage: 12 to 30 Vdc
Adjustment: Zero and span (potentiometer)
Range of Sensitivity: 100 to 5500 pF
Frequency Oscillation: 400 kHz
Output: 4 to 20 mA (2-wire)
Process Connection: ¾ to 1½ NPT, tri-clamp or flange
Wetted Material: 316 SS or ECTFE/ETFE
Enclosure Material: Glass-filled nylon or aluminum die cast
Max Pressure: 290 psi (20 bar)
Operating Temperature: -10 to 120°C (14 to 248°F)
Class Protection: NEMA 4 (IP65)
Max Probe Length: 1.8 m (6')
Dimensions:
Nylon Head: 89 W x 64 mm H (3.5 x 2.5")
Aluminum Die-Cast Head: 89 W x 108 mm H (3.5 x 4.25")
Diameter of Probe: 16 mm (5⁄8")
Electrical Connection: Cable gland with ½ NPT conduit
Note: The LV4000 Series probes require a galvanic isolator, LI-420.
SPECIFICATIONS (LI-420)
Input Current from the Evaluation Instrument: 4 to 20 mA
Input Voltage: 22 to 24 Vdc
Output Current: 4 to 20 mA
Output Voltage to the Transducer at 20 mA: 12.5 V
Output Voltage to the Transducer at 4 mA: 15.5 V
Resistance per Conductor: 15 Ω
Testing Voltage Input/output circuit: 2000 Veff
Domestic Current Demand: 300 ±60 µA
Ambient Temperature: -20 to 70°C (-4 to 158°F)
Enclosure Dimensions: 44 W x 82 H x 110 mm L (1¾ x 3¼ x 43⁄8)
SPECIFICATIONS (LVCN410 SERIES)
Operating Voltage: 24 Vdc, 110 or 240 Vac (50/60 Hz)
Current Consumption: 4 mA
Adjustment: Zero and span (potentiometer) and 2 switch point (potentiometer)
Range of Sensitivity: 50 to 1000 pF
Output: 4 to 20 mA and 2-relay SPDT
LVCN411/LVCN412: 73 W x 110 H x 110 mm L (27⁄8 x 43⁄8 x 43⁄8")
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