Economic efficient measurement and high accuracy. Wide measuring scope, range ratio is 15:1 No pressure loss, blocking proof.

> Working principle

The metering system of the electromagnetic flow meter primary is based on Faraday’s laws of electromagnetic induction, on the channel border which is vertical each other with metering tube axis and line of magnetic field mount one pair detecting electrode, when the conductive liquid move along the metering tube axis the conductive liquid cutting the line of magnetic field induce the inductive E.M.F. This EMF detect out by two electrodes on the metering tube, numerical value size is:

E=KBVD

here: E - inductive EMF;

K - instrument constant;

B - magnetic induction

V - average flow velocity in metering tube section;

D - metering tube inner diameter;

When measuring flow rate, the fluid flow through magnetic field verticaled to flow direction, the conductive liquid movement induce one EMF in direct proportion to average flow velocity, so that require measured flow liquid conductivity higher than lowest limit. Its induction voltage signal is detected by two electrodes, and pass through a cable transmit to converter, after through signal treatment and correlative operation, take the integrating flow and the instantaneous delivery indicate on the display screen of the converter.

> Instrument characteristics

1.1   In metering tube have not chocked-flow and movable component, therefore it can not causes extra energy loss also can not causes stop up, so that its energy saving effect is remarkable, especial suit to measure liquid-solid two phase flow such as sewage,slurry,ore pulp,water-coal pulp,paper pulp and so on.

1.2   Of contact with measured medium only have liner and electrode, as long as reasonably select liner and electrode material it can attain good non-corrodibility and wear ability, so that can measure various acid and alkali chemical solution.

1.3   Installation demand is low. A straight upstream section only need 5D and downstream section is 2D (D is inner diameter of selected instrument).

1.4   Measurement accuracy non-subject to the influence for variation of the fluid density, viscosity, temperature, pressure and conductivity, also can measure positive / negative two directional flow rate, which has provided the very good means for precise measurement of flow rate.

1.5   Instrument watt consumption is small, lower than 5VA.

1.6   The Converter have good changeability, need not renew real flow calibrating can gain measurement accuracy.

Because of the electromagnetic flow meter have a serial strong point, so that it gain the more the wider application in various industry, become a first choice instrument of liquid flow measurement.

WP-EMF series Electromagnetic flowmeter

> > Features:

WP-EMF series electromagnetic flowmeter is developed based on using experience in domestic and oversea fields. It is not only durable and easy to operate, but also has stable stability with HF and LF excitation which can adapt to bad environment in fields.

> >Technical parameter:

1 Analog current output:

 Load resistance: when 0~10mA, 0~1.5 kΩ; when 4~20mA, 0~750 Ω

 Basic error: 0.1% ± 10 μA

2 Frequency output:

 Frequency output range: 1~5000Hz

 Output electric isolation: photoelectricity isolation. Isolating voltage: >1000V DC

 Frequency output drive: field-effect tube output, max enduring voltage 36V DC, max load current 250mA

3 Pulse output:

 Pulse output equivalent weight: 0.001~1.000m3/cp, 0.001~1.000Ltr/cp

 Pulse output width: 50ms, automatically change into square wave when HF

 Output electric isolation: photoelectricity isolation. Isolating voltage: >1000V DC

 Pulse output drive: field-effect tube output, max enduring voltage 36V DC, max load current 250mA

4 Alarm output:

 Alarm output connection point: ALMH - - - high limit alarm; ALML - - - low limit alarm

 Output electric isolation: photoelectricity isolation. Isolating voltage: >1000V DC

 Alarm output drive: Darlington transistor output, max enduring voltage 36V DC, max load current 250mA

5 Communication interface and protocol:

 MODBUS interface: RTU format, physical interface RS-485, photoelectricity isolation 1000V

 HART interface: support standard HART protocol, with HART handset, online display measuring value, and modify instrument parameter

6 Electric isolation

 The insulation voltage between analog input and analog output is not less than 500V;

 The insulation voltage between analog input and alarm power supply is not less than 500V;

 The insulation voltage between analog input and AC power supply is not less than 500V;

 The insulation voltage between analog output and AC power supply is not less than 500V;

 The insulation voltage between analog output and earth is not less than 500V;

 The insulation voltage between pulse output and AC power supply is not less than 500V;

 The insulation voltage between pulse output and earth is not less than 500V;

 The insulation voltage between alarm output and AC power supply is not less than 500V;

 The insulation voltage between alarm output and earth is not less than 500V.

Electromagnetic flow meter