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Vibration Limit Switch LVL-A7

Vibration Limit Switch LVL-A7
Vibration Limit Switch LVL-A7

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артикул: 71220
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  • Limit switch for liquids
  • External function test with test magnet
  • Onsite function check possible thanks to LED indication
  • Large selection of process connections for hassle-free installation in existing systems
  • Easy to install even at points difficult to access due to compact design
  • Rugged stainless steel housing
  • Suitable for process temperatures up to 150 °C (302 °F)
  • Cost-saving plug connections
  • Approval as overfill protection and leak detection system acc. to WHG
Параметр Значение
Общие характеристики
Артикул 71220
Материал see technical information (TI)
Switching current max. 250 mA
Ambient temperature -40 ... 70 °C (-40 ... 158 °F)
Storage temperature -40 ... 85 °C (-40 ... 185 °F)
Degree of protection - IP65/67, NEMA 4X enclosure (plug M12) - IP65, NEMA 4X enclosure (valve plug) - IP65/68, NEMA 4X/6P enclosure (cable)
Connection - cable 5 m - valve plug NPT1/2 - valve plug QUICKON - valve plug M16 - plug M12
Mass see technical information (TI)
Rated voltage - DC-PNP: 10 ... 35 V DC, 3-wire - AC/DC: 20 ... 253 V AC/DC, 2-wire
Power consumption - DC-PNP: < 975 mW - AC/DC: < 850 mW
Switching point 13 mm ± 1 mm
Electromagnetic compatibility NE 21
Construction type compact device device with short tube
Operating mode MAX = maximum safety: The device keeps the electronic switch closed as long as the liquid level is below the fork. example application: overspill protection MIN = minimum safety: The device keeps the electronic switch closed as long as the fork is immersed in liquid. example application: dry running protection of pumps The electronic switch opens if the limit is reached, if a fault occurs or in the event of a power fails (quiescent current principle)
Measurement range min. 0.7 g/cm , optional> 0.5 g/cm
Output type switch output
Reference operating conditions - ambient temperature: 25 °C (+77 °F) - process pressure: 1 bar (14.5 psi) - fluid: water (density: approx. 1 g/cm , viscosity: 1 mm /s) - medium temperature: 25 °C (+77 °F) - density setting: > 0.7 g/cm - switching time delay: standard (0,5 s, 1 s)
Vibration resistance a(RMS) = 50 m/s , ASD = 1.25 (m/s ) /Hz, f = 5 to 2000 Hz, t = 3 x 2 h
Dimensions see technical information (TI)
Process connection - thread ISO 228 G1/2, G3/4, G1 - thread EN 10226 R1/2, R3/4, R1 - thread ASME MNPT1/2, MNPT3/4, MNPT1
Hysteresis max. 3 mm
Measuring method The tuning fork is brought to its resonance frequency by means of a piezoelectric drive. If the tuning fork is covered by liquid, this frequency changes. The electronics monitor the resonance frequency and indicate whether the tuning fork is freely vibrating or is covered by liquid.
Supplementary information Statement of Conformity, Declaration of Conformity, Attestation of Conformity and instructions have to be observed where applicable. For information see www.pepperl-fuchs.com.
Designation see technical information (TI)
Directive 2014/30/EU EN 61326-1:2006 , EN 61326-2-3:2006
Shock resistance a = 300 m/s = 30 g, 3 planes x 2 directions x 3 shocks x 18 ms, as per test Ea
Display elements The LED display is on the connection side. - green LED: indication of ready to operate - red LED: fault indication - yellow LED: operating mode indication
Directive 2014/35/EU EN 61010-1:2010
Current consumption - DC-PNP: < 15 mA - AC/DC: < 3.8 mA
Installation position see section mounting position
Influence of ambient temperature negligible
Measuring frequency approx. 1100 Hz in air
Measured variable density
Climate class DIN EN 60068-2-38/IEC 68-2-38
Measured value resolution < 0.5 mm
Non-repeatability ± 1 mm acc. to DIN 61298-2
Influence of medium temperature -25 µm/°C
Influence of medium pressure -20 µm/bar
Switching time - 0.5 s when tuning fork is covered - 1.0 s when tuning fork is uncovered - other switching times on request
Medium temperature -40 ... +100 °C (-40 ... +212 °F) -40 ... +150 °C (-40 ... +302 °F)
Process pressure (static pressure) -1 ... +40 bar (-14.5 ... +580 psi)
State of aggregation liquid
Density min. 0.7 g/cm , optional> 0.5 g/cm
Viscosity 1 ... 10000 mPa/s, dynamic viscosity
Solid contents < ∅5 mm
Surface quality R < 3.2 µm
Function test function test with test magnet (optional accessory)
Overspill protection Z-65.11-554 (overspill protection acc. to WHG) Z-65.40-555 (leak detection system acc. to WHG) If you need the approvals also in paper form, select the option WH in the type code.
Supplementary documentation technical information (TI) manual (BA) approval (ZE)

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