MICRO PROCESS CONTROL

 

 

 

 

 

    Electromagnetic Flowmeter

 
  INTRODUCTION
electromagnetic-flowmeter
 
electromagnetic-flowmeters

ADDMAS full bore flow meter is a cost effective flow meter for conductive liquids such as Raw Water, Chilled water, effluents, Potable water and industrial chemicals. Using time proven electromagnetic flow metering principle, ADDMAS flow meters are available for pipes from ½ “ NB to 6” NB. Since there are no moving parts, the flow meter gives years of maintenance free service. It’s performance is independent of temperature, pressure, density and viscosity of medium. The flow meter is obstruction less and hence the pressure drop is almost negligible.

ADDMAS has all the features required in field mountable metering equipment. These include - weather proof / flame proof enclosure, RS485 communication option , with 4 to 20 mA isolated Current output for Flow signal transmission option for process control. The converter is available as field mounted-IP65 protection category. An optional batching controller also available on request.

 
FEATURES :
High Accuracy Flow metering
Optional Digital Transmission
Isolated 4 to 20 mA current output
IP 65 Field / Wall mounted Enclosure
2 Line Alpha numeric back lit display
Flange / sandwich type mounting
Easy maintenance as no moving part.
Operates over wide range of Pressure and Temperature.
Low cost against highest quality.
MEASURING PRINCIPLE
The operating principle of Magnetic flowmeters is based upon Faraday’s Law of electromagnetic induction, “ It state that a
voltage will be induced in a conductor moving through a magnetic field”.
 
electromagnetic flowmeter
 
Faraday’s Law :

E = kBDV where,
E = Induced Voltage,
B = Strength of the magnetic field,
D = Conductor Width
V = Velocity of the conductor
The magnitude of the induced voltage E is directly proportional to the velocity of the conductor width D, and the strength of the magnetic field B. Liquid acts as a conductor as it flows through pipes.
 
APPLICATION

This Flowmeters find varied applications where the flowing medium is difficult to handle. Major advantage of these flowmeters are : zero pressure drop, No moving part and highest accuracy level at most affordable cost. Some of the major application can be described below
 
• Effluent Treatment plant
• Sewage Treatment plant.
• Water supply Schemes
• Pulp and Papers
• Sugar industries and distilleries
• Steel and Aluminums
• Chemical / Pharmaceuticals
• Food and Drugs.
 
ADVANTAGES
Tolerates High percentage of suspended solids Sludge, slurries, minerals, paper, sewage – flows with high level of solids which can not be measured other type of meters.
Obstruction less measurements
Nothing projects into the flow stream, no head loss, no parts to maintain.
Suitable for corrosive liquid
Acids, caustic and corrosive additives are isolated from the meter pipe by inert linings and compatible electrodes.
Suitable for all types of electrically conductive liquids Liquid where conductivity is of sufficient level to induce measurable e.m.f..
 
TECHNICAL SPECIFICATIONS
1 ) Medium Conductivity
:
>5 uS/cm
2 ) Meter Sizes
:
1/2'”,1”,2”,3”,4” ,6”,8” NB Pipe flanges For Higher size consult Factory.
3 ) Flow Tube Part
:
S Series : SS 316
P Series : Poly-Propylene
4 ) Electrodes
:
SS 316L or optionally Hastalloy ‘C’
5 ) Materials
:
 
    • S series
Flow Tube : SS 316 [ non magnetic]
Electrodes : SS 316 / Hastalloy C / Platinum
Lining : PTFE or Neoprene options
Flanges : SS 304/SS316/SS 316L
Sensor Housing : CS, Epoxy painted/ SS 304
 
 
    P series
Flow Tube : Polypropylene
Electrode : SS 316 / Hastalloy C
6 ) Material of Housing
:
Aluminum / Powder coated
7 ) Flow Velocity
:
0.1 to 10 m/s in two ranges
8 ) Pressure Rating………
:
S series : standard Flanges - ASA150 options on request 10 bar Standard, higher on request
P series : 10 Bar at 55ºC
9 ) Operating Temperature
      Medium
:
 
    S series
:
0 to 150 Deg.C for PTFE lining
0 to 60 DegC for Neoprene lining
    P series
:
0 to 55 ºC
10 ) Operating Temperature
      Ambient
:
0 to 55 Deg. C
11 ) Temperature Drift
:
+/- 0.016% / Deg.C
12) Power Supply …………
:
100 VAC TO 250 VAC
13) Power Consumption
:
15VA max
14) Outputs ………………
:
4 to 20 mA DC isolated in 500 ohms max Load
:RS485 with Modbus RTU protocol (OPTIONAL)
15) Accuracy
:
+/- 0.5% of Flow +/- 3 mm /Sec from 0.5m/sec to 10 m/sec
16) Repeatability
:
+/- 0.2% of reading +/-3mm/sec
17) Key Board and Display
:
3 Keys with
2 lineX16 ch LCD- A/N display , back lit
18) Flow parameter
:
Programmable
- Volume Units : ltrs, M3, ML, CF, BG
- Time Units : sec, min, hrs
19) Configurable Parameters
:
F.S. for 4 to 20 mA range,
%Low flow cut off,
Communication Parameters
Calibration Constant
Damping (Filter)
20) Calibration
:
Factory Calibrated on certified flow rig
21) Cable Entries
:
4 nos. for Remote Conveter
up to 3 nos. for integrally mounted Converter
22) Ingress protection
:
IP 65
23) Flame proof Version
:
Please contact factory
     
Typical error graph
 
TYPICAL FLOW RATE TABLE
Pipe - Size (NB)
At Velocity 0.5 m/sec in LPM
At Velocity 5 m/sec in LPM
15 (1/2")
~5
~50
25 (1”)
~15
~150
40 (1 ½ “)
~37
~370
50 (2”)
~60
~600
65 (21/2”)
~100
~1000
80 (3”)
~150
~1500
100(4”)
~235
~2350
150 (6”)
~530
~5300
200(8”)
~830
~8300
 
 

 

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