Limit switch for liquids,Process connection G1,Suitable for process temperatures up to 150 °C (302 °F),Rugged stainless steel housing,Onsite function check possible thanks to LED indication,External function test with test magnet
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. Construction type : 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) Connection : This device may be used with any sequential circuit, as long as the circuit can support the electrical circuit values of the switching elements. Rated voltage : 10 ... 35 V DC Fusing : external 500 mA slow Current consumption : < 15 mA Power consumption : 975 mW Residual ripple : 5 V ss at 0 ... 400 Hz Measured variable : density Measurement range : min. 0.7 g/cm3 Output type : switch output Switching current : max. 250 mA Electromagnetic compatibility : Electromagnetic compatibility : NE 21 Degree of protection : IEC 60529 Shock resistance : EN 60068-2-27 Vibration resistance : EN 60068-2-64 Climate class : DIN EN 60068-2-38/IEC 68-2-38 Reference operating conditions : - ambient temperature: 25 °C (+77 °F)
- process pressure: 1 bar (14.5 psi)
- fluid: water (density: approx. 1 g/cm3, viscosity: 1 mm2/s)
- medium temperature: 25 °C (+77 °F)
- density setting: > 0.7 g/cm3
- switching time delay: standard (0,5 s, 1 s) Measured value resolution : < 0.5 mm Measuring frequency : approx. 1100 Hz in air Switching point : 13 mm ± 1 mm Non-repeatability : ± 1 mm acc. to DIN 61298-2 Hysteresis : max. 3 mm Influence of ambient temperature : negligible 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 Switch-on delay : max. 3 s Installation conditions : Ambient conditions : Process conditions : Degree of protection : IP65 , NEMA 4X Connection : valve connector M16 Material : process connection and short tube: stainless steel 316L (1.4401/1.4435)
tuning fork: stainless steel 316L
housing cover and connector: PPSU Surface quality : Ra < 3.2 µm Mass : approx. 169 g Process connection : thread G1 acc. to ISO 228 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 Function test : function test with test magnet (optional accessory) CSA approval : cCSAus Listed, General Purpose Overspill protection : see approval (ZE) Supplementary documentation : technical information (TI)
manual (BA)
approval (ZE) 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)