Smart Electromagnetic Flow Meter
The electromagnetic flowmeter is composed of two parts by electromagnetic flow sensor and electromagnetic flow converter.The operation of an electromagnetic flowmeter is based on Faraday law of electromagnetic induction.The mainly parts of the sensor are: measuring tube,electrode poles,excitation coil,iron core,yoke and housing. The measuring tube of the sensor is a short alloy tube whose diameter is D, the inner surface of it has an insulating liner.Two electrodes are fixed in the measuring tube along with the diameter direction of it and they usually flush with the inner surface liner.When excitation coil pulsed by two-way square wave,there generates a working magnetic field with a flux density B in the vertical direction of the measurement axis.In the meantime,if some electrical conductivity liquid flows at an average velocity V through the measuring tube ,cuts lines of the magnetic field,there generates induced electromotive force E.Electromotive force E is directly proportional to the product of flux density B、measuring tube diameter D and average velocity V,that's: E BVD. Electromotive force E(flow signal) is measured by the electrodes and transmitted to transducer through cable.After the transducer handles the flow signal by magnifying it, the flow and total amount can be displayed,also will output pulse and analog current etc.
Nominal Pressure: 0.6~4.0MPa
Accuracy: ±0.5% of the value displayed, ±0.3% or ±0.2% are optional
Liner material:Teflon, PFA, F46, Neoprene, Polyurethane.
Electrode Type: General type, scraper type and replaceable type.
Electrode material:SS316, Hastelloy B, Hastelloy C, Titanium, Tantalum, Platinum-iridium, Stainless steel covered with tungsten.
|Technical Performance Parameters|
|Diameter Nominal||DN10 ~ DN1000|
|Nominal Pressure||0.6~4.0MPa(special pressure can be made to)|
|Accuracy||±0.5 %, ±2mm/s (flowrate < 1m/s)|
|Liner material||PFA,F46,Neoprene,PTFE, FEP|
|Electrode material||Stainless steel SUS316, Hastelloy C, Titanium, Tantalum Platinum-iridium|
|Medium Temperature||Integral type||-10°C~+80°C|
|Split type||-25 – 180℃|
|Medium Electrical conductivity||water 20μS/cm other medium 5μS/cm|
|Structure type||Integral type, split type|
|Product Standard||JB/T 9248-1999 Electormagnetic Flowmeter|
|Lining material||Main Performance||Applications|
|Teflon||1.The most steady material in plastics which is resistibal to boiling hydrochloric |
acid,vitriolandqua fortis as well as strong alkali and organic impregnates.
2.Not be perfect in abrasion resistance.
|Strong corrosive mediums such |
as strong acid and alkali
|PFA||Having the same abrasion resistance with PTFE.|
Having strong ability of load pressure resistance.
|Applicable in state of load pressure|
|F46||1.Have the same abrasion resistance with PTFE.|
2.Resistable for low abrasion.
3.Having strong resistance to load pressure.
|1.The same as PTFE.2.Applicable |
in mediums of low abrasion.
|Neoprene||1.Be of good elasticity,retractility and abrasion resistance.|
2.Be resistant to low aicd,alkali and salt but not for oxidation mediums.
|Water,sewage and slurry,mineral |
serosity of low abrasion.
|Polyurethane||1.Be of good abrasion resistibility.|
2.Not be perfect in acid/alkali resisitance.
3.Can't be used for water mixed with organic impregnants.
|Applicable in mineral serosity,slurry |
and coal slurry of high abrasion
|Stainless steel SUS316||Applicable in water,sewage and corrosive mediums.Widely used in industries of petrol,|
covered with tungsten carbide
|Applicable in mediums of no corrosive and low abrasion.|
|Hastelloy B(HB)||Having strong resistance to hydrochloric acid of any consistance which is below bioling |
piont. Also resistable against vitriol,phosphate,hydrofluoricacid,organic acid etc which
are oxidable acid,alkali and non-oxidable salt.
|Hastelloy C(HC)||Be resistant to oxidable acid such as nitric acid,mixed acid as well as oxidable salt such as|
Fe+++,Cu++and sea water
|Titanium||Applicable in seawater,and kinds of chloride,hypochlorite salt,oxidable acid(including|
fuming nitric acid),organic acid,alkali etc.Not resistant to a pure reducing acid(such as
sulphuric acid,hydrochloric acid)corrosion.But if acid contains antioxidant(such as
Fe+++,Cu++)is greatly reduce corrosion.
|Da||In addition to hydrofluoric acid, fuming sulfuric acid, alkali remaining outside chemicals, |
including boiling hydrochloric acid
|Platinum-iridium||Almost be applicable in all chemical mediums except for aqua fortis,ammonium salt.|
Technical parameters of whole flowmeter and sensor:
±0.5% of indicating value(flow velocity 0.8m/s); ±4mm/s(flow velocity＜0.8m/s )
PTFE,Poly neoprene,Polyurethane,F46,PFA with net
-25 deg.C~+60 deg.C
Convertor and integrated type
-10 deg.C~+60 deg.C
Poly Neoprene Lining
80 deg.C;120 deg.C(notes in order)
100 deg.C;150 deg.C(notes in order)
PFA with net
Material of signal electrode and ground electrode
SS316L,HastelloyB,HastelloyC,Ti,Ta,Platinum-iridium alloy,Stainless steel coating with tungsten carbide
Electrode drawknife apparatus
Connection flange material
Connection ring material
ND15~DN3000 separated sensor with rubber or PU lining
IP65 or IP68
Other sensors and separated converter
Explosion proof sensor and converter
Normally the separation distance between converter and sensor is less than 100m,if more please order specially.(Note: our company provide 10m length standardly,if need more, please indicate the length in order, and the cost will be add more)
Output of analog current
0~10mA load resistance 0~1.5Ω
4~20mA load resistance 0~750Ω
Separated type output by two way: forward and reverse flow; integrated type output one way
Frenquency range:0~5KHz,uper limit 1~5 optionally
Square wave or pulse with 25ms pulse width
Transistor switch output with isolation protection,can absorb 250mA current and withstanding 35V voltage
Two-path alarm output
Alarmable(programable)high/low flow,blank pipe,fault condition,forward and reverse flow,simulation volume exceeds range,pulse volume exceeds range,disconnect pulse small signal
Transistor switch output with isolation protection,can absorb 250mA current and withstanding 35V voltage(Not isolated with pulse output)
Explosion proof mark
Separated Exd[ia] ⅡCT4(converter) ExdeiaⅡCT4(sensor)