Flowmetering Electromagnetic flowmeters 3
Local regulations may restrict the use of this product to below the conditions quoted. In the interests of development and improvement of the product, we reserve the right to change the specification without notice. © Copyright 2020
TI-P309-01 EMM Issue 3
ELM ElectroMagnetic Inductive Flowmeter
Description An electrically conductive medium induces a voltage while flowing through an arranged magnetic field in accordance to the Faraday's induction law. A magnetic inductive flowmeter consits of an isolated lining tube, flown through by a conductive liquid, a magnetic field coil and two electrodes. The electrode measuring-circuit voltage is proportional to the flow velocity and therefore to the volume flow. The electrode voltage is detected by a transmitter and converted into standard electrical signals as 4-20 mA or pulses. The magnetic-inductive flow sensor EP is used to measure the volume flow of liquids, slurries, pastes and other electrically conductive media without any pressure drop. Pressure, temperature, density and viscosity do not affect the volume measurements. Portions of solid particles and small gas bubbles should be avoided. Sizes and pipe connections The ELM is available in wafer design, suitable for fitting between the following flanges: DN25, DN32, DN40 and DN50 EN 1092-1 PN40 DN65, DN80, DN100, DN150 and DN200 EN 1092-1 PN16 1", 1¼", 1½" and 2" ASME B16.5 Class 300 2½", 3", 4" 6" and 8" ASME B16.5 Class 150 Pressure / temperature limits Maximum process pressure DN25 - DN50 PN40 DN65 - DN200 PN16
3.8 1
Materials Flowmeter body
Steel coated / painted
Lining
PTFE
Maximum process temperature Minimum process temperature
150 °C -20 °C
Electrodes Hastelloy C4 Electronics housing Die cast aluminium, painted
Maximum electronics ambient temperature
60 °C
Technical data IP rating
IP67 (EN60529)
Power supply
24 Vdc 10 W
1 x 0 / 4 - 20 mA active with galvanic isolation 1 x Pulse / state passive, with galvanic isolation. 24 V, 60 mA
Outputs
Communication HART ® (optional) Diagnosis functions Empty pipe detection, coil current monitoring Performance Uncertainty
±0.3% of measured value ±0.01% (Q at 10 m / s) under reference conditions ±0.15% of measured value ±0.005% (Q at 10 m / s) under reference conditions
Repeatability
>= 5 µS / cm >= 20 µS / cm with demineralized water
Conductivity
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