生活污水流量計(jì)合適丈量導(dǎo)電介質(zhì)體積流量的流量儀表,丈量原理基于法拉第電磁感應(yīng)定律。電磁流量計(jì)主要組成局部是：丈量管、電極、勵(lì)磁線圈、鐵芯與磁軛殼體。它主要用于丈量封鎖管道中的導(dǎo)電液體和漿液中的體積流量。包括酸、堿、鹽等強(qiáng)腐蝕性的液體。該產(chǎn)品普遍應(yīng)用于石油、化工、冶金、紡織、食品、制藥、造紙等行業(yè)以及環(huán)保、市政管理，水利建立等范疇。

詳細(xì)介紹

污水流量計(jì)產(chǎn)品特點(diǎn)：

１、測量不受流體密度、粘度、溫度、壓力和電導(dǎo)率變化的影響；
２、測量管內(nèi)*流動(dòng)部件，無壓損，直管段要求較低；
３、系列公稱通徑DN25～DN3000。傳感器襯里和電極材料有多種選擇；
４、轉(zhuǎn)換器采用新穎勵(lì)磁方式，功耗低、零點(diǎn)穩(wěn)定、度高。流量范圍度可達(dá)1500：1；
５、轉(zhuǎn)換器可與傳感器組成一體型或分離型；
６、轉(zhuǎn)換器采用16位高性能微處理器，2x16LCD顯示，參數(shù)設(shè)定方便，編程可靠；
７、流量計(jì)為雙向測量系統(tǒng)，內(nèi)裝三個(gè)積算器：正向總量、反向總量及差值總量；可顯示雙向流量，并具有多種輸出（電流、脈沖和數(shù)字、HART通訊）；
８、轉(zhuǎn)換器采用表面安裝技術(shù)(SMT)，具有自檢和自診斷功能；
城市污水流量計(jì)主要技術(shù)數(shù)據(jù)：
整機(jī)和傳感器技術(shù)數(shù)據(jù)
執(zhí)行標(biāo)準(zhǔn)
JB／T 9248—1999
公稱通徑
15、20、25、32、40、50、65、80、100、125、150、200、250、300、350、400、450、500、600、700、800、900、1000、1200、1400、1600、1800、2000、2200、2400、2600、2800、3000
zui高流速
15m／s
度
DNl5～DN600
示值的：±0.3％(流速≥1m／s)；±3mm／s(流速<1m／s)
DN700—DN3000
示值的±0.5％(流速≥0.8m／S)；±4mm／s(流速<0.8m／S)
流體電導(dǎo)率
≥5uS／cm
公稱壓力
4.0MPa
1.599MPa
1.0MPa
0.6MPa
6.3、10MPa
DN25～DN150
DNl5～DN600
DN200～DN1000
DN700～DN2500
特殊訂貨
環(huán)境溫度
傳感器
—25℃—十60℃
轉(zhuǎn)換器及一體型
—10℃—十60℃
襯里材料
聚四氟乙烯、聚氯丁橡膠、聚氨酯、聚全氟乙丙烯(F46)、加網(wǎng)PFA
zui高流體溫度
—體型
70℃
分離型
聚氯丁橡膠襯里
80℃；120℃(訂貨時(shí)注明)
聚氨酯襯里
80℃
聚四氟乙烯襯里
100℃；150℃(訂貨時(shí)注明)
聚全氟乙丙烯(F46)
加網(wǎng)PFA
信號(hào)電極和接地電極材料
不銹鋼0Crl8Nil2M02Ti、哈氏合金C、哈氏合金B(yǎng)、鈦、鉭、鉑／銥合金、不銹鋼涂覆碳化鎢
電極刮刀機(jī)構(gòu)
DN250—DN3000
連接法蘭材料
碳鋼
接地法蘭材料
不銹鋼1Crl8Ni9Ti
進(jìn)口保護(hù)法蘭材料
DN65—DNl50
不銹鋼1Crl8Ni9Ti
DN200～DNl600
碳鋼十不銹鋼1Crl8Ni9Ti
外殼防護(hù)
DNl5～DN3000分離型橡膠或聚氨酯襯里傳感器
IP65或IP68
其他傳感器、——體型流量計(jì)和分離型轉(zhuǎn)換器
IP65
間距(分離型)
轉(zhuǎn)換器距離傳感器一般不超過100m
 
轉(zhuǎn)換器技術(shù)數(shù)據(jù)：
電源
交流
85—265V，45—400Hz
直流
11—40V
操作鍵和顯示
按鍵式
4個(gè)薄膜按鍵可設(shè)定選擇全部參數(shù)，也可利用PC機(jī)(RS232)對(duì)轉(zhuǎn)換器設(shè)定編程；
3行LCD寬視角、寬溫、帶背光顯示；
第1行顯示流量值；
第2行顯示流量單位；
第3行顯示流量百分比、正向總量、反向總量、差值總量、報(bào)警、流速。
磁鍵式
2個(gè)磁鍵用于顯示參數(shù)的選擇和復(fù)位，利用PC機(jī)(RS232)對(duì)轉(zhuǎn)換器設(shè)定編程；
2行LCD寬視角、寬溫、帶背光顯示：
第1行:磁鍵選擇:顯示流量百分比、正向總量、反向總量、差值總量、報(bào)警、流速。
第2行：顯示流量。
內(nèi)部積算器
正向總量、反向總量及差值總量。
輸出信號(hào)
單向模擬輸出
全隔離，負(fù)載≤600D．(20mA時(shí))；
上限：0—21mA可選，每檔lmA；
下限：0—21mA可選，每檔1mA；
正、反向流量輸出方式編程。
雙向模擬輸出
下限限制為。或4mA，其他同單向模擬輸出。
雙向脈沖輸出
兩路輸出分別對(duì)應(yīng)正向和反向流量,頻率0～800Hz,上限1—800Hz可選,每檔IHz；
方波或選定脈寬，選定脈寬上限2．5S，每檔1ms；
無源隔離晶體管開關(guān)輸出，可吸收250mA的電流，耐壓35V。
雙路報(bào)警輸出
可報(bào)警(編程)高／低流量、空管、故障狀態(tài)、正，，反向流量、模擬量超量程、脈沖量超量程、脈沖小信號(hào)切除，輸出極性可選；
帶隔離保護(hù)的晶體管開關(guān)輸出,可吸收250mA的電流,耐壓35V.(與脈沖輸出不隔離)
數(shù)字通訊

RS232，RS485，HART
 
襯里的選擇：
襯里材料
主要性能
zui高介質(zhì)溫度
適用范圍
—體型
分離型

聚四氟乙烯（F4)
是化學(xué)性能zui穩(wěn)定的一種塑料，能耐沸騰的鹽酸、硫酸、硝酸和王水，也能耐濃堿和各種有機(jī)溶劑。不耐三氟化氯、高溫三氟化氯、高流速液氟、液氧、自氧的腐蝕。
70℃
100℃ 150℃ (需特殊訂貨)
1、濃酸、堿等強(qiáng)腐蝕性介質(zhì)。2、衛(wèi)生類介質(zhì)。
聚全氟乙丙烯（F46)
同F(xiàn)4，耐磨性、抗負(fù)壓能力高于F4。
同上

聚氟合乙烯（Fs)
適用溫度上限較聚四氟乙烯低，但成本也較低。
80℃

聚氯丁橡膠
1、有*的彈性，高度的扯斷力，耐磨性能好。2、耐一般低濃度酸、堿、鹽介質(zhì)的腐蝕，不耐氧化介質(zhì)的腐蝕。
80℃ 120℃ (需特殊訂貨)
水、污水、弱磨損性的泥漿礦漿。
聚氨酯橡膠
1、耐磨性能*。
2、耐腐蝕性能較差。
80℃
中性強(qiáng)磨損的礦漿、煤漿、泥漿

進(jìn)口保護(hù)法蘭和接地法蘭(或接地環(huán))的選擇
蘭種類
適 用 范 圍
接地法蘭(或接地環(huán))
適用于非導(dǎo)體管道，如塑料管道，但有接地電極的傳感器不需要。
進(jìn)口保護(hù)法蘭
當(dāng)介質(zhì)有強(qiáng)磨損性時(shí)選用。
電極的選擇
電極材料
耐蝕及耐磨性能
不銹鋼0Crl8Nil2M02Ti
用于工業(yè)用水、生活用水、污水等具有弱腐蝕性的介質(zhì)，適用于石油、化工、鋼鐵等工業(yè)部門及，市政、環(huán)保等領(lǐng)域。
哈氏合金B(yǎng)
對(duì)沸點(diǎn)以下的一切濃度的鹽酸有良好的耐蝕性，也耐硫酸、磷酸、氫氟酸、有機(jī)酸等非氯化性酸、堿，非氧化性鹽液的腐蝕。
哈氏合金C
能耐非氧化性酸，如硝酸、混酸、或鉻酸與硫酸的混合介質(zhì)的腐蝕，也耐氧化性鹽類如：Fe，”、、Cu”下或含其他氧化劑的腐蝕，如高于常溫的次氯酸鹽溶液、海水的腐蝕
鈦
能耐海水、各種氯化物和次氯酸鹽、氧化性酸(包括發(fā)煙硫酸)、有機(jī)酸、堿的腐蝕。不耐較純的還原性酸(如硫酸、鹽酸)的腐蝕，但如酸中含有氧化劑(如硝酸、Fc＋＋、Cu＋＋)時(shí)，則腐蝕大為降低。
鉭
具有優(yōu)良的耐蝕性和玻璃很相似。除了氫氟酸、發(fā)煙硫酸、堿外，幾乎能耐——切化學(xué)介質(zhì)(包括沸點(diǎn)的鹽酸、硝酸和l 50℃以下的硫酸)的腐蝕。在堿中刁；耐蝕。
鉑／鈦合金
幾乎能耐——切化學(xué)介質(zhì)，但不適用于王水和銨鹽。
不銹鋼涂覆碳化鎢
用于無腐蝕性，強(qiáng)磨損性的介質(zhì)。
注： 由于介質(zhì)種類繁多，其腐蝕性又受溫度、濃度、流速等復(fù)雜因素影響而變化，故本表僅供參考。用戶應(yīng)根據(jù)實(shí)際情況自己做出選擇，必要時(shí)應(yīng)做擬選材料的耐腐試驗(yàn)，如掛片試驗(yàn)。

ZB-LD電磁流量計(jì)工作原理：
ZB-LD電磁流量計(jì)測量原理是基于法拉第電磁感應(yīng)定律。流量計(jì)的測量管是一內(nèi)襯絕緣材料非導(dǎo)磁合金短管。兩只電極沿管徑方向穿通壁固定在測量管上。其電極頭與襯里內(nèi)表面基本齊平。勵(lì)磁線圈由雙向方波脈沖勱磁時(shí)，將在與測量管軸線垂直的方向上產(chǎn)生一磁通量密度為Ｂ的工作磁場。此時(shí)，如果具有一定電導(dǎo)率的液體流經(jīng)測量管，將切割磁力線感應(yīng)出電動(dòng)勢Ｅ。電動(dòng)勢Ｅ正比于磁通量密度Ｂ,測量管內(nèi)徑d與平均流速V 的乘積。電動(dòng)勢Ｅ（流量信號(hào)）由電極檢出并通過電纜送至轉(zhuǎn)換器。轉(zhuǎn)換器將流量信號(hào)放大處理后，可顯示流體流量，并能輸出脈沖，摸擬電流等信號(hào)，用于流量的控制和調(diào)節(jié)。     E＝KBdV
式中:  E――――為電極間的信號(hào)電壓（V）
B――――磁通密度（T）
d――――測量管內(nèi)徑（m）
      V――――平均流速（m/s）
   式中K，d為常數(shù)，由于勵(lì)磁電流是恒流的，故B也是常數(shù)，則由E＝KBdV可知，體積流量Q與信號(hào)電壓E成正比，即流速感應(yīng)的信號(hào)電壓E與體積流量Q成線性關(guān)系。因此,只要測量出E就可確定流量Q，這就是電磁流量計(jì)的基本工作原理。
由E＝KBdV可知，被測流體介質(zhì)的溫度、密度、壓力、電導(dǎo)率、液固兩相流體介質(zhì)的液固成分比等參數(shù)不會(huì)影響測量結(jié)果。至于流動(dòng)狀態(tài)只要符合軸對(duì)稱流動(dòng)（如層流或紊流）就不會(huì)影響測量結(jié)果的。因此說電磁流量計(jì)是一種真正的體積流量計(jì)。對(duì)于制造廠和用戶來說，只要用普通的水實(shí)際標(biāo)定后就可測量其他任何導(dǎo)電流體介質(zhì)的體積，而不需作任何修正，這是電磁流量計(jì)的一突出優(yōu)點(diǎn)，是其他任何流量計(jì)所沒有的。測量管內(nèi)無活動(dòng)及阻流部件，因此幾乎沒有壓力損失，并具有很高的可靠性。
ZB-LD系列電磁流量計(jì)儀表選型：
1、量程范圍確認(rèn)
一般工業(yè)用電磁流量計(jì)被測介質(zhì)流速以2～4m/s為宜，在特殊情況下，zui低流速應(yīng)不小于0.2m/s，zui高應(yīng)不大于8m/s。若介質(zhì)中含有固體顆粒，常用流速應(yīng)小于3m/s，防止襯里和電極的過分磨擦；對(duì)于粘滯流體，流速可選擇大于2m/s，較大的流速有助于自動(dòng)消除電極上附著的粘滯物的作用，有利于提高測量精度。
在量程Q已確定的條件下，即可根據(jù)上述流速V的范圍決定流量計(jì)口徑D的大小，其值由下式計(jì)算：
Q=πD2V/4
Q:流量（㎡/h） D:管道內(nèi)徑 V：流速（m/h）
電磁流量計(jì)的量程Q應(yīng)大于預(yù)計(jì)的zui大流量值，而正常的流量值以稍大于流量計(jì)滿量程刻度的50為宜。
2、ZB-LD系列電磁流量計(jì)參考流量范圍
口徑mm
流量范圍m3/h
口徑mm
流量范圍m3/h
φ15
0.06~6.36
φ450
57.23～5722.65
φ20
0.11～11.3
φ500
70.65～7065.00
φ25
0.18～17.66
φ600
101.74～10173.6
φ40
0.45～45.22
φ700
138.47～13847.4
φ50
0.71～70.65
φ800
180.86～18086.4
φ65
1.19～119.4
φ900
228.91～22890.6
φ80
1.81～180.86
φ1000
406.94～40694.4
φ100
2.83～282.60
φ1200
553.90～55389.6
φ150
6.36～635.85
φ1600
723.46～72345.6
φ200
11.3～1130.4
φ1800
915.62～91562.4
φ250
17.66～176.25.
φ2000
1130.4～113040.00
φ300
25.43～2543.40
φ2200
1367.78～136778.4
φ350
34.62～3461.85
φ2400
1627.78～162777.6
φ400
45.22～4521.6
φ2600
1910.38～191037.6
 
 
DN15～DN150一體型和傳感外形圖
    外形尺寸和重量                      
公稱通徑
DN    L    W    H    參考重量kg
一體型    傳感器
15    200    140    174    10    7
20    200    140    174    12    9
25    200    140    174    14    11
40    200    176    210    16    13
50    200    176    210    17    14
65    200    214    250    25    22
80    200    214    250    29    26
100    250    230    312    31    28
150    300    230    370    41    38
 
 
法蘭尺寸(標(biāo)準(zhǔn):GB/T9119)                                              
公稱通徑
DN    壓力1.6MPa    壓力4.0MPa
D    d1    d0    n    b    D    d1    d0    n    b
15    

The city sewage special flow meter is suitable for measuring the flow rate of the conductive medium flow meter, the measurement principle is based on Faraday's law of electromagnetic induction. The main components of the electromagnetic flowmeter are: measuring tube, electrode, excitation coil, iron core and yoke shell. It is mainly used to measure the volume flow in the conductive liquid and slurry in a closed pipe. Including acid, alkali, salt and other strong corrosive liquids. The products are widely used in petroleum, chemical, metallurgy, textile, food, pharmaceutical, paper and other industries and environmental protection, municipal management, water conservancy construction and other fields.
City sewage for the flow meter Features:
1, the measurement is not affected by fluid density, viscosity, temperature, pressure and conductivity changes;
2, the measurement tube without obstruction of moving parts, no pressure loss, straight pipe requirements lower;
3, series of nominal diameter DN25 ~ DN3000. Sensor lining and electrode materials have a variety of options;
4, the converter uses a new excitation method, low power consumption, zero stability, high accuracy. Flow range of up to 1500: 1;
5, the converter can be integrated with the sensor or separation type;
6, the converter uses 16-bit high-performance microprocessors, 2x16LCD display, parameter settings convenient, reliable programming;
7, the flow meter for the two-way measurement system, built-in three totalizer: positive total, reverse total and the difference between the total; can display two-way flow, and has a variety of output (current, pulse and digital, HART communication );
8, the converter using surface mount technology (SMT), with self-test and self-diagnostic function;
Main technical data of municipal sewage special flowmeter:
Machine and sensor technical data
Implementation of standards
JB / T 9248-1999
Nominal diameter
15,20,25,32,40,50,65,80,100,125,150,200,250,300,350,400,450,500,600,700,800,900,1000,1200,1400, 1600, 1800, 2000, 2200, 2400, 2600, 2800, 3000
Maximum flow rate
15m / s
Accuracy
DNl5 ~ DN600
Value: ± 0.3% (flow rate ≥ 1m / s); ± 3mm / s (flow rate <1m / s)
DN700-DN3000
± 0.5% (flow rate ≥0.8m / s); ± 4mm / s (flow rate <0.8m / s)
Fluid conductivity
≥5uS / cm
Nominal pressure
4.0MPa
1.599MPa
1.0MPa
0.6MPa
6.3,10MPa
DN25 ~ DN150
DNl5 ~ DN600
DN200 ~ DN1000
DN700 ~ DN2500
Special order
Ambient temperature
sensor
-25 ° C to 10 ° C
Converters and integrated
-10 ° C to 10 ° C
Lining material
Polytetrafluoroethylene, polychloroprene rubber, polyurethane, polyfluoroethylene propylene (F46), screening PFA
Maximum fluid temperature
- size
70 ° C
Separation type
Polychloroprene rubber lining
80 ℃; 120 ℃ (when ordering)
Polyurethane lining
80 ° C
Polytetrafluoroethylene lining
100 ℃; 150 ℃ (when ordering)
Polyfluoroethylene propylene (F46)
PFA
Signal electrode and ground electrode material
Stainless steel 0Crl8Nil2M02Ti, Hasloy C, Hasloy B, titanium, tantalum, platinum / iridium alloy, stainless steel coated tungsten carbide
Electrode scraper mechanism
DN250-DN3000
Connecting flange material
Carbon steel
Ground flange material
Stainless steel 1Crl8Ni9Ti
Import protection flange material
DN65-DNl50
Stainless steel 1Crl8Ni9Ti
DN200 ~ DNl600
Carbon steel ten stainless steel 1Crl8Ni9Ti
Shell protection
DNl5 ~ DN3000 separate rubber or polyurethane liner sensor
IP65 or IP68
Other sensors, - body flowmeters and separate converters
IP65
Pitch (separate)
The converter distance sensor is generally no more than 100m
 
Converter Technical Data:
power supply
communicate with
85-265V, 45-400Hz
DC
11-40V
Operation keys and display
Button type
4 film buttons can be set to select all parameters, you can also use the PC (RS232) to set the converter programming;
3 lines LCD wide viewing angle, wide temperature, with backlight display;
Line 1 shows the flow value;
Line 2 shows the traffic unit;
Line 3 shows the percentage of traffic, the total amount of forward, the total amount of reverse, the total amount of difference, alarm, flow rate.
Magnetic key type
2 magnetic keys are used to display the parameters of the selection and reset, the use of PC (RS232) on the converter set programming;
2 lines LCD wide viewing angle, wide temperature, with backlight display:
Line 1: Magnetic key selection: Displays the percentage of traffic, the total amount of the forward, the total amount of the reverse, the total amount of the difference, the alarm, and the flow rate.
Line 2: Displays traffic.
Internal integrator
The total amount of the forward, the total amount of the reverse and the total amount of the difference.
output signal
Unidirectional analog output
Full isolation, load ≤ 600D. (20mA);
Upper limit: 0-21mA optional, each file lmA;
Lower limit: 0-21mA optional, each file 1mA;
Positive, reverse flow output mode programming.
Bidirectional analog output
The lower limit is. Or 4mA, the other with unidirectional analog output.
Bidirectional pulse output
Two output corresponding to the forward and reverse flow, frequency 0 ~ 800Hz, upper limit 1-800Hz optional, each file IHz;
Square wave or selected pulse width, selected pulse width upper limit 2.5S, each file 1ms;
Passive isolation transistor switch output, can absorb 250mA of current, voltage 35V.
Dual alarm output
Can be alarm (programming) high / low flow, empty tube, fault state, positive ,, reverse flow, analog overrange, pulse over range, pulse small signal cut, the output polarity optional;
With isolation protection transistor switch output, can absorb 250mA of current, voltage 35V. (With the pulse output is not isolated)
Digital communication

RS232, RS485, HART
 
Lining options:
Lining material
Main performance
Maximum medium temperature
The scope of application
- size
Separation type

Teflon (F4)
Is the most stable chemical properties of a plastic, boiling water, sulfuric acid, nitric acid and aqua regia, but also resistant to alkali and a variety of organic solvents. Intolerance to chlorine trifluoride, high temperature chlorine trifluoride, high flow liquid fluoride, liquid oxygen, corrosion from oxygen.
70 ° C
100 ℃ 150 ℃ (need special order)
1, concentrated acid, alkali and other corrosive media. 2, health media.
Polyfluoroethylene propylene (F46)
With F4, wear resistance, anti-negative pressure capacity higher than F4.
Ibid

Polyfluoroethylene (Fs)
Applicable temperature limit is lower than polytetrafluoroethylene, but the cost is low.
80 ° C

Polychloroprene rubber
1, there is excellent flexibility, a high degree of tearing, wear resistance is good. 2, resistance to the general low concentration of acid, alkali, salt media corrosion, intolerant oxidation of the media corrosion.
80 ℃ 120 ℃ (need special order)
Water, sewage, weak wear mud slurry.
Polyurethane rubber
1, wear resistance is extremely strong.
2, poor corrosion resistance.
80 ° C
Neutral strong wear of pulp, coal slurry, mud

The choice of imported protective flange and ground flange (or grounding ring)
Blue species
The scope of application
Ground flange (or ground ring)
Suitable for non-conductor piping, such as plastic piping, but with a grounding electrode for sensors that are not required.
Import protection flange
When the media has a strong abrasion when used.
Electrode selection
electrode material
Corrosion resistance and wear resistance
Stainless steel 0Crl8Nil2M02Ti
For industrial water, domestic water, sewage and other weak corrosive media, suitable for petroleum, chemical, steel and other industrial sectors, municipal, environmental protection and other fields.
Hasloy B
The boiling point of all the following concentrations of hydrochloric acid has good corrosion resistance, but also resistant to sulfuric acid, phosphoric acid, hydrofluoric acid, organic acids and other non-chlorinated acid, alkali, non-oxidizing salt corrosion.
Hasloy C
Resistant to non-oxidizing acids such as nitric acid, mixed acid, or chromic acid and sulfuric acid mixed medium corrosion, but also resistant to oxidation of salts such as: Fe, ",, Cu" or with other oxidants corrosion, such as higher than room temperature Hypochlorite solution, corrosion of seawater
titanium
Ability to seawater, all kinds of chloride and hypochlorite, oxidizing acid (including fuming sulfuric acid), organic acid, alkali corrosion. Intolerant to less pure reductive acids (such as sulfuric acid, hydrochloric acid) corrosion, but if the acid contains oxidants (such as nitric acid, Fc ++, Cu ++), the corrosion is greatly reduced.
Tantalum
Excellent corrosion resistance and glass are very similar. In addition to hydrofluoric acid, fuming sulfuric acid, alkali, almost resistant to - cut chemical medium (including boiling point of hydrochloric acid, nitric acid and l 50 ℃ below the sulfuric acid) corrosion. In the alkali Diao; corrosion resistance.
Platinum / titanium alloy
Almost resistant to - cut chemical medium, but not suitable for aqua regia and ammonium salts.
Stainless steel coated with tungsten carbide
For non-corrosive, strong abrasive media.
Note: Due to the wide variety of media, its corrosion and temperature, concentration, flow rate and other complex factors change, so this table is for reference only. Users should make their own choice according to the actual situation, if necessary, should be prepared to decay the test material, such as coupon test.

ZB-LD electromagnetic flowmeter works:
ZB-LD electromagnetic flowmeter measurement principle is based on Faraday's law of electromagnetic induction. The flowmeter's measuring tube is a lined with insulating material non-conducting alloy short tube. The two electrodes are fixed to the measuring tube in the radial direction through the wall. The electrode tip is substantially flush with the inner surface of the liner. When the field coil is magnetized by bi-directional square wave, a magnetic field with a magnetic flux density B is generated in the direction perpendicular to the axis of the measuring tube. At this time, if a certain conductivity of the liquid flow through the measuring tube, the cutting force line induction electromotive force E. The electromotive force E is proportional to the magnetic flux density B, the product of the inner diameter d of the measuring tube and the average flow velocity V. The electromotive force E (flow signal) is detected by the electrode and sent to the converter via a cable. Converter will flow signal amplification process, can display the fluid flow, and can output pulse, analog current and other signals for the flow control and regulation. E = KBdV
Where: E ---- is the signal voltage between the electrodes (V)
B - magnetic flux density (T)
D - measuring tube diameter (m)
      V - average flow rate (m / s)
   Where K is a constant, the excitation current is constant, so B is constant, then by E = KBdV we can see that the volume flow Q is proportional to the signal voltage E, that is, the flow rate sensing signal voltage E and the volume flow Q into Linear relationship. Therefore, as long as the measurement of E can determine the flow Q, which is the basic working principle of electromagnetic flowmeter.
From E = KBdV, it can be seen that the parameters such as temperature, density, pressure, conductivity, liquid-solid composition ratio of liquid-solid two-phase fluid medium will not affect the measurement results. As for the flow state as long as the axis of symmetric flow (such as laminar or turbulent) will not affect the measurement results. So that the electromagnetic flowmeter is a true volume flowmeter. For the manufacturer and the user, as long as the actual water after the actual calibration can measure the volume of any other conductive fluid medium, without any correction, which is a prominent advantage of electromagnetic flowmeter, is any other flowmeter No. There is no activity and resistance flow in the measuring tube, so there is almost no pressure loss and a high reliability.
ZB-LD series electromagnetic flow meter instrument selection:
1, range range confirmation
General industrial electromagnetic flowmeter measured medium flow rate of 2 ~ 4m / s is appropriate, in special circumstances, the minimum flow rate should be not less than 0.2m / s, the maximum should not be greater than 8m / s. If the medium contains solid particles, the common flow rate should be less than 3m / s, to prevent the lining and the electrode of excessive friction; for viscous fluid, the flow rate can be selected greater than 2m / s, the larger flow rate helps to automatically remove the stick Stagnation of the role, is conducive to improving the measurement accuracy.
The size of the flowmeter diameter D can be determined according to the range of the above-mentioned flow rate V under the condition that the range Q has been determined. The value is calculated by the following formula:
Q = πD2V / 4
Q: flow rate (㎡ / h) D: pipe diameter V: flow rate (m / h)
The range of the electromagnetic flowmeter Q should be greater than the expected maximum flow value, and the normal flow value to slightly larger than the flow meter full scale 50 is appropriate.
2, ZB-LD series of electromagnetic flowmeter reference flow range
Caliber mm
Flow range m3 / h
Caliber mm
Flow range m3 / h
φ15
0.06 to 6.36
φ450
57.23 ~ 5722.65
φ20
0.11 to 11.3
φ500
70.65 ~ 7065.00
φ25
0.18 to 17.66
φ600
101.74 ~ 10173.6
φ40
0.45 to 45.22
φ700
138.47 to 13847.4
φ50
0.71 to 70.65
φ800
180.86 ~ 18086.4
φ65
1.19 to 119.4
φ900
228.91 ~ 22890.6
φ80
1.81 to 180.86
φ1000
406.94 ~ 40694.4
φ100
2.83 ~ 282.60
φ1200
553.90 ~ 55389.6
φ150
6.36 to 635.85
φ1600
723.46 ~ 72345.6
φ200
11.3 ~ 1130.4
φ1800
915.62 ~ 91562.4
φ250
17.66 ~ 176.25.
φ2000
1130.4 ~ 113040.00
φ300
25.43 ~ 2543.40
φ2200
1367.78 ~ 136778.4
φ350
34.62 ~ 3461.85
φ2400
1627.78 ~ 162777.6
φ400
45.22 ~ 4521.6
φ2600
1910.38 ~ 191037.6
 
 
DN15 ~ DN150 integrated and sensing outline
Dimensions and weight
Nominal diameter
DN L W H Reference weight kg
Integrated sensor
15 200 140 174 10 7
20 200 140 174 12 9
25 200 140 174 14 11
40 200 176 210 16 13
50 200 176 210 17 14
65 200 214 250 25 22
80 200 214 250 29 26
100 250 230 312 31 28
150 300 230 370 41 38
 
 
Flange size (standard: GB / T9119)
Nominal diameter
DN pressure 1.6MPa pressure 4.0MPa
D d1 d0 n b D d1 d0 n b
15