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Параметр | Значение |
Общие характеристики | |
Артикул | 74004 |
Материал | process connection and short tube: stainless steel 316L (1.4401/1.4435) tuning fork: stainless steel 316L housing cover and connector: PPSU |
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/IP67 , NEMA 4X |
Connection | M12 connector, 4-pin |
Mass | approx. 140 g |
Rated voltage | 10 ... 35 V DC |
Fusing | external 500 mA slow |
Power consumption | 975 mW |
Switching point | 13 mm ± 1 mm |
Electromagnetic compatibility | NE 21 |
Construction type | compact device |
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 |
Output type | switch output |
Residual ripple | 5 V at 0 ... 400 Hz |
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 |
Process connection | thread G1/2 to ISO 228 |
CSA approval | cCSAus Listed, General Purpose |
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) |
Switch-on delay | max. 3 s |
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 2004/108/EC | EN 61326-1:2006 , EN 61326-2-3:2006 |
Current consumption | < 15 mA |
Installation position | see technical information (TI) |
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 |
Medium temperature | -40 ... 100 °C (-40 ... 212 °F) |
Process pressure (static pressure) | -1 ... +40 bar (-14.5 ... +580 psi) |
State of aggregation | liquid |
Density | min. 0.7 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 | see approval (ZE) |
Supplementary documentation | technical information (TI) manual (BA) approval (ZE) |