They can be used to accurately measure the flow rate of liquids which are electrical conducting, caustic, and mixed with liquids and solids.They are widely used throughout industries of petroleum, chemical engineering,pharmacology,paper making,electric power, environmental protection and so forth.

Features:
No moving parts, virtually no pressure loss;
Corrosion protection,abrasion resistant;
High accuracy,stable performance;
High level of anti-vibration and anti-jamming,wide measuring dimensions.
Multi-output interface:4-20mA,Pulse,Alarm outputs,RS485 and MODBUS communication.      

 

Working principle:

Structure:
    TR-DC series electromagnetic flow meters are made up of sensor and transducer,together with LCD screen,current and pulse output,alarm signal and RS-485 communication.

 

Operating principle:

    Faraday's laws of induction from the basis for the electromagnetic flow meters.It states that a voltage is induced in a conductor as it moves through a magnetic filed.
    This principle is applied to a conductive fluid which flows through a magnetic field generated perpendicular to the flow direction(see Schematic). 
    The voltage induced in the fluid is measured at two electrodes,installed diametrically opposed.This signal voltage UE is proportional to the magnetic induction B, the electrode spacing D are constants,a proportionality exists between the signal voltage UE and the average flow velocity v. The equation for the volume flow shows that the signal voltage UE is linear and proportional to the volume flow rate. The induced signal voltage is processed in the converter into scaled, analog and digital signals.

 

Technical parameters:

Nominal meter size	10-2200mm(3/8 to 86 inch)
Accuracy	±0.5%
Minimum Conductivity	>5μs/cm
Fluid temperature	-25 to 60°C(-13 to 140°F) -25 to 180°C(-13 to 356°F)(opt.)
Liner	CR,FEP,PTFE,PFA
Ambient temperature	-10 to 60°C(14 to 140°F)
Electrode material	SS316L(Standard),Hastelloy,Tantalun,Titanium,Tungsten Carbide(Upon requirements)
Current Output	0 to 10mA or 4 to 20mA
Frequency Output	0 to 5000Hz with photoelectric isolation
Pulse Output	Adjustable from 0.001 to 1000Ltr/Pulse
Alarm Output(opt.)	Upper Alarm-ALMH,Lower Alarm-ALML with photoelectric isolation Upper Alarm-ALMH,Lower Alarm-ALML with photoelectric isolation
Communications(opt.)	RS-232 without galvanic isolation RS-485 with galvanic isolation MODBUS
Power supply	85 to 250VAC(45 to 63Hz) 20-36VDC
Power	S<10QW/AC S<7.5W/DC