Liquid Turbine Flow Meter
Liquid Turbine Flow Meter is suitable for measuring a liquid flow rate of low viscosity, featuring a high accuracy and a strong bearing capacity of high process pressure.The product may be widely applied in petrochemical industry, metallurgical industry and other fields of scientific research. It may also be applied in food service industry and hydraulic systems . The pre-amplifiers are classified into common type, 4~20mA standard current signal output type and explosion proof type, and the flow detectors fall into common type, wearing resistant type and anti-corrosive type .
Product Details
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Liquid turbine flow meter is a velocity flow meter.It is used to measure volume flow rate of a liquid that fills a closed pipeline and flows continuously in it. In actual application, type LWGY turbine flow meter integrates with relevant flow indication instrument say flow integrating instrument, also, it may combine with LRT series converter display to form a integral type to measure and indicate flow raterate and quantity of a liquid, to pulse output signals and standard current signals and to provide power-off data protection.
A permanent magnet, an induction coil and an amplifying unit are placed in the preamplifier. When the measured fluid is flowing across the flow meter, it drives the turbine to rotate, and the turbine periodically changes reluctance value of the magnetic circuit, which makes the magnetic flux passing the coil vary periodically, thus to induce in the coil the pulsating current signal, which is delivered to a secondary instrument after amplification and treatment, or provide in-situ display, so as to achieve flow rate accumulation.Within the measuring range, the impeller rotate is positively proportional to the flow rate, namely the impulse total is in direct ratio to the quantity flow.Ratio of the two is termed as K-factor, which is indicated by letter “K” (P/L).The instrument constant value of each flow meter is educed by means of actual flow calibration.Divide impulse frequency f and impulse total N measured by the flow meter by instrument constant K of it respectively, the flow rate rate q (L/s) and the quantity Q (L) will be calculated.
Main Technical parameters :
Flow unit : m3/h
| Nomin al diamet er
Dn (mm) |
Flow rate | Nominal pressure PN
（Mpa） |
Max pressure loss
（Mpa） |
|||||
| Intrinsic error limit
±0.2% |
Intrinsic error limit
0.5% |
Intrinsic error limit
1.0% |
||||||
| Lower limit | Upper limit | Lower limit | Upper limit | Lower limit | Upper limit | |||
| 2* | – | – | – | – | 0.010 | 0.130 | 1.6 | 0.15 |
| 3* | – | – | – | – | 0.040 | 0.250 | 1.6 | 0.12 |
| 4* | – | – | – | – | 0.04 | 0.25 | 6.3 | |
| 6 | 0.1 | 0.6 | 0.1 | 0.6 | 6.3
16* 25* 25 40* |
0.08 | ||
| 10 | 0.25 | 1.2 | 0.2 | 1.2 | ||||
| 15 | 1 | 4 | 0.6 | 4 | 0.6 | 6 | ||
| 20 | 1.5 | 7 | 1.1 | 7 | 0.7 | 7 | ||
| 25 | 2 | 10 | 1.6 | 10 | 1 | 10 | 0.04 | |
| 32 | 3.2 | 16 | 2.5 | 16 | 1.5 | 15 | 2.5
2.5 2.5 2.5 2.5 |
|
| 40 | 4 | 20 | 3 | 20 | 2.5 | 25 | ||
| 50 | 8 | 40 | 4 | 40 | 4 | 40 | ||
| 65 | 12 | 60 | 6 | 60 | 6 | 60 | ||
| 80 | 20 | 100 | 10 | 100 | 10 | 100 | ||
| 100 | 25 | 160 | 20 | 160 | 16 | 160 | 1.6 or 2.5 | |
| 150 | 50 | 300 | 40 | 300 | 40 | 400 | ||
| 200 | 120 | 600 | 100 | 600 | 80 | 800 | 1.6 | |
| 250* | 200 | 1000 | 160 | 1000 | 120 | 1200 | ||
| 300* | 250 | 1600 | 180 | 1800 |
Installations :
1) Installation area
The installation area should be in conformity with a temperature range of -25 ～ +55℃，a humidity＜80%RH（non- condensing） Good ventilation, free of solarization and rain. A place free of vibration or stress from piping. Avoiding a place apt to strong heat radiation and radioactive impacts . The disturbance of detection signal resulted from outside strong electromagnetic field must be avoided.If such disturbance can not be averted, such measures as a shield enclosure should be added on the amplifier of the flow meter (transducer) to eliminate interferences. At a place requires explosion proof measures, explosion suppression amplifiers shall be applied. The installation position should be tailored to easy installation, operation and maintenance.
2) Installation posture and position
In order to ensure a high measuring accuracy, the flow meter (transducer) shall be horizontally installed on a horizontal pipeline, and the arrow sign on the flow meter that indicates the flow direction shall be made consistent with the liquid flow direction.In case a vertical installation is a must, the liquid shall be made flow from the down to top, so that the body of the flow meter will be ensured full of liquid.
3）Piping requirements
To eliminate influences of the measuring accuracy resulting from uneven flow velocity distribution of cross section inside a pipeline, both the upperstream and the downstream of the flow meter shall be installed with definite straight lengths, or be installed with flow straighteners to substitute some straight lengths. Normally, the upperstream straight length shall be no smaller than 15D, and the downstream straight length no smaller than 5D (D stands for the nominal diameter of the flow meter.)
