Electromagnetic Flowmeter
Electromagnetic flowmeters can be used in almost all branches of industry for the measurement of liquids (with or without solids content) pulps, pastes and other fluids that have a specific minimum of electric conductivity.
Superior electronics give you superior results - reliable and repeatable even under difficult process conditions, while quality manufacturing guarantee years of trouble-free use.
At KROHNE, all electromagnetic flowmeters are wet-calibrated by direct comparison of volumes, the most accurate calibration method of all. The KROHNE calibration rig is the world's largest and most accurate.
Compared with other measurement methods, electromagnetic flowmetering offers the following particular advantages:
- Measurement independent of pressure, density, temperature and viscosity
- Short inlet and outlet runs
- Free pipe cross section
- No additional pressure losses
- No moving parts
- Any desired installation location
- Measurement span 100:1
- High accuracy - up to ± 0.2 % of actual value
The liner and the electrodes of the flow sensors are available in various materials that will match almost any application.
Ultrasonic Flowmeters
Ultrasonic flowmeters (UFM's) find universal use for non-contact measurement of all fluids and gasses in which ultrasonic waves can propagate. The principle of measurement is based on ultrasonic transit time.
All our ultrasonic flowmeters are calibrated on the world's largest and most accurate calibration rig.
The Highlights of KROHNE's Ultrasonic Flowmeters:
- High measuring accuracy independent of viscosity, temperature and conductivity
- No pressure loss through the smooth metering tube and no obstructions to flow
- Exact calibration by direct volume comparison
- Intrinsically safe version to European Standard for Zone 0
- Low operating cost thanks to low power consumption and zero maintenance
Variable Area Flowmeters
Variable area flowmeters from KROHNE offer not only the maximum possible accuracy but also maximum reliability. A wealth of experience and an intelligent quality assurance system enables us to place our VA meters in applications inaccessible to other manufacturers such as nuclear power stations where safety is critical
Technical features
Flowmeters operating on the float principle are suitable for both liquids and gases. This method is inexpensive yet highly accurate and reliable.
Benefits of variable area flowmeters
- Accurate measurement even at very low flow rates
- Standard rangeability of 10 : 1 (ratio of full-scale to lower limit value)
- Suitable for low operating pressures
- Minimal pressure losses
- Local indication without the need for auxiliary power
- Can be used even with short or no straight inlet/outlet runs
- Essential components easily replaced
- Exact calculations to VDI codes.
Vortex Flowmeters
Vortex flowmeters operate on the Karman vortex street principle to measure the volumetric flowrate of gases, fluids and vapours.
- for temperatures from -20...+430°C (-4...806°F) and pressure up to 100 bar (1450 psig)
- high measuring accuracy (< 0.5% for liquids and <1.0% for gasses) and high reproducibility; stable measurement at Re > 5000
- non-contact measurement, no mechanically moving sensor parts, maintenance-free
- suitable for vertical or horizontal installation
- compact and remote electronics (up to 15 m / 50 ft) versions available
- flange version DN 15 - DN 300
- sandwich version DN 15 - DN 200 in stainless steel or Hastelloy C, low sensitivity to pipework noise and conditions
- communication via HART®-Protocol
Applications
- for flow velocities up to 7.7 m/s (25.3 ft/s) for liquids or 80 m/s (260 ft/s) for gases and steam
- hot steam measurement, also for CIP and SIP applications in the food industry
- specially developed for measurement of low flow rates
- measurement of liquid operating media with low conductivity
- measurement of additions in wastewater treatment
Level Measuring Instruments: Level Gauges and Level Switches
KROHNE offers a comprehensive and versatile range of level gauges and level switches for measurement of fluid levels.
KROHNE level products are found in all industries, in all storage tanks and silos, in Ex areas, onshore and offshore as well as on tanker ships, road and rail transporters.
Implementation of various measuring principles, advanced technology and rigid quality control have produced measuring instruments which guarantee high accuracy even under extreme operating conditions. Their applications extend from liquid sulphur at 140° C (284° F) to the storage of liquified gases; from tanks on ocean-going ships to storage tanks in nuclear power stations.
Even at an operating pressure of 400 bar (5800 psig), you can still count on us. However, the easier problems are just as welcome. In all cases, our measuring instruments combine high accuracy, reliability, and economy.
- Ex-Certificates of conformity
- Approvals as part of an overfill protection system
- Approval in conformity with the Druckbehälterverordnung (German pressure vessel code) and various other international approvals
Our devices can be fitted with a choice of user-specific process connections. Various interfaces such as RS 485, Modbus, PROFIBUS-PA, HART® and DTM / FDT 1.2 Systems are available for intelligent data communication.
