I. Introduction KH-LWGY turbine flowmeter turbine flowmeter type flow meter is learned at home and abroad advanced technology and optimized design, has a simple structure, lightweight, high precision, reproducibility is good, responsive, easy installation and maintenance features a new generation of turbine flowmeters are widely used to measure the closed pipe and stainless steel 1Cr18Ni9Ti, 2Cr13 and corundum Al2O3, carbide corrode, and no fibers, particles and other impurities, the kinematic viscosity at operating temperature is less than 5 × 10-6m2 / s liquid, for kinematic viscosity greater than 5 × 10-6m2 / s of liquid, solid solution after the flowmeter calibration use. If the display instrument with special features, can also be A quantitative control, excessive alarm, etc., is an ideal flow metering and energy meter. Kind of turbine flow product itself has live display, but also the traffic signal in the form of pulses of remote output. Instrument inexpensive, high integration, small size, especially for the secondary display device, PLC, DCS and other control systems with the use of a computer. Second, the turbine flowmeter Features 1. High accuracy, generally up to ± 1% R, ± 0.5% R, high-precision up to ± 0.2% R; 2. good reproducibility, short-term repeatability of up to 0.05% to 0.2 %, it is due to good reproducibility, such as frequent calibration or online high accuracy calibration available in trade settlement is the preferred flow meter; 3. Output pulse frequency signal suitable for measurement of total and with computer connection, no zero drift, anti-jamming capability; 4. availability of high frequency signals (3-4kHz), signal resolution and strong; 5. wide range of degrees, medium and large caliber up to 1:20, small caliber 1:10; 6. Compact and lightweight, easy installation and maintenance, flow capacity; 7. apply high voltage measurement, the meter body does not have to cut, easy to type instrument made of high pressure; 8. special type of sensor types, according to user designed for the special needs of all kinds of special sensors, such as low temperature, two-way type, mine type, sand and other special type; 9. Insertion can be made suitable for large diameter measurement, pressure loss, low price, without drying up Remove, easy installation and maintenance. Category 1 turbine flowmeter. By instrumentation functional classification, KH-LWGY Series turbine flowmeter can be divided into two categories, namely: ■ turbine flow sensor / transmitter ■ intelligent integration turbine flowmeter 2. Functional Description turbine flow sensor / transmitter such turbine flow product itself does not have on-site display, only traffic signal remote output. Traffic signals can be divided pulse signal or current signal (4-20mA); inexpensive instrument price, high integration, small size, especially for the secondary display device, PLC, DCS and other control systems with the use of a computer. Such products are divided into basic turbine flow type and explosion-proof (ExdIIBT6) two kinds, according to the shape shown in different output signals, such products can be divided into KH-LWGY-N-type and KH-LWGY-A type Figure 1 Basic type sensor / transmitter 2 Ex-sensor / transmitter KH-LWGY-N-type sensors: 12 ~ 24VDC power supply, three-wire pulse output, high ≥8V, low ≤0.8V; signal transmission distance ≤ 1000 m; KH-LWGY-A transmitter: 24VDC power supply, wire 4-20mA output signal transmission distance ≤1000. Intelligent integration of turbine flowmeter uses advanced ultra-low-power single-chip microprocessor technology developed turbine flow sensor and display totalizer integration of new smart meters, with double LCD live show, with a compact body, intuitive readings clear, reliability high power without outside interference, anti-lightning, low cost obvious advantages. Meter with three meter factor correction coefficient nonlinear intelligent compensation instrument, and can be corrected on-site. High-definition LCD display also shows the instantaneous flow rate (four significant figures) and the cumulative flow (8 significant digits, with a clear function). All valid data after power is not lost for 10 years. Class turbine flowmeter are explosion-proof products, explosion-proof grade: ExdIIBT6. Figure 3 Figure 4 turbine flowmeter intelligent integration intelligent integration with HART communication class turbine flowmeter turbine flowmeter in accordance with power supply, the availability of remote signal output can be divided KH-LWGY-B-type and KH-LWGY-C type KH-HTGY-B Type: Power supply using 3.2V10AH lithium battery (can run continuously for more than 4 years); no signal output function. KH-LWGY-C Type: Power supply with 24VDC external power supply, the output of a standard two-wire 4-20mA current signal, and according to the different needs of the field, increase the RS485 or HART communication. Third, the turbine flowmeter 1. Basic parameters and technical performance technical performance: Table 1 meter diameter and connection 4,6,10,15,20,25,32,40 threaded connections (15,20,25,32,40 ) 50,65,80,100,125,150,200 flange connection Accuracy class ± 1% R, ± 0.5% R turndown ratio 1:10; 1:15; 1:20 304 meter stainless steel material, 316 (L ) stainless steel measured medium temperature (℃) -20 ~ + 120 ℃ Environmental Conditions Temperature -10 ~ + 55 ℃, relative humidity of 5% to 90%, atmospheric pressure 86 ~ 106Kpa output signal pulse frequency signal, low ≤0.8V High ≥8V power supply + 12VDC, + 24VDC (optional) signal transmission lines STVPV3 × 0.3 (three-wire) transmission distance ≤1000m signal line interface Houseman connector proof grade non-hazardous product protection class IP65 2. Measuring range and work Pressure: Table 2 meter diameter (mm) normal flow range (m3 / h) extended flow range (m3 / h) General withstand pressure (MPa) special pressure rating (MPa) (flange connection) DN 4 0.04 ~ 0.25 0.04 ~ 0.4 6.3 12,16,25 DN 6 0.1 ~ 0.6 0.06 ~ 0.6 6.3 12,16,25 DN 10 0.2 ~ 1.2 0.15 ~ 1.5 6.3 12,16,25 DN 15 0.6 ~ 6 0.4 ~ 8 6.3,2.5 (France Lan) 4.0,6.3,12,16,25 DN 20 0.8 ~ 8 0.45 ~ 9 6.3,2.5 (flange) 4.0,6.3,12,16,25 DN 25 1 ~ 10 0.5 ~ 10 6.3,2.5 (flange) 4.0,6.3,12,16,25 DN 32 1.5 ~ 15 0.8 ~ 15 6.3,2.5 (flange) 4.0,6.3,12,16,25 DN 40 2 ~ 20 1 ~ 20 6.3,2.5 (flange) 4.0, 6.3,12,16,25 DN 50 4 ~ 40 2 ~ 40 2.5 4.0,6.3,12,16,25 DN 65 7 ~ 70 4 ~ 70 2.5 4.0,6.3,12,16,25 DN 80 10 ~ 100 5 ~ 100 2.5 4.0,6.3,12,16,25 DN 100 20 ~ 200 10 ~ 200 2.5 4.0,6.3,12,16,25 DN 125 25 ~ 250 13 ~ 250 1.6 2.5,4.0,6.3,12,16 DN 150 30 ~ 300 15 ~ 300 1.6 2.5,4.0,6.3,12,16 DN 2, 00 80 ~ 800 40 ~ 800 1.6 2.5,4.0,6.3,12,16 four, turbine flowmeter selection table 3 Model Description LWGY- KH □ / □ / □ / □ / □ / □ / □ nominal size 4 4mm, standard range 0.04 ~ 0.25m3 / h, a wide range of 0.04 ~ 0.4m3 / h 6 6mm, standard range 0.1 ~ 0.6m3 / h, the amount of wheel width is 0.06 ~ 0.6m3 / h 10 10mm, standard range 0.2 ~ 1.2m3 / h, a wide range of 0.15 ~ 1.5m3 / h 15 15mm, standard range 0.6 ~ 6m3 / h Wide range of 0.4 ~ 8m3 / h 20 20mm, standard range 0.8 ~ 8m3 / h, a wide range of 0.4 ~ 8m3 / h 25 25mm, standard range 1 ~ 10m3 / h, a wide range of 0.5 ~ 10m3 / h 32 32mm, standard range 1.5 ~ 15m3 / h, a wide range of for 0.8 ~ 15m3 / h 40 40mm, standard range 2 ~ 20m3 / h, a wide range is 1 ~ 20m3 / h 50 50mm, the standard range of 4 ~ 40m3 / h, a wide range of 2 ~ 40m3 / h 65 65mm, standard range 7 ~ 70m3 / h, a wide range of 4 ~ 70m3 / h 80 80mm, standard range 10 ~ 100m3 / h, a wide range of 5 ~ 100m3 / h 100 100mm, standard range 20 ~ 200m3 / h, a wide range of 10 ~ 200m3 / h 125 125mm, standard range 25 ~ 250m3 / h, a wide range of 13 ~ 250m3 / h 150 150mm, standard range 30 ~ 300m3 / h, a wide range of 15 ~ 300m3 / h 200 200mm, standard range 80 ~ 800m3 / h, Wide Range of 40 ~ 800m3 / h type N + 12V power supply, pulse output, high accuracy level ≤0.8V ≥8V low precision 0.5 05 1.0 10 precision wide-range turbo turbine type W Material S 304 Turbo S standard stainless steel L 316 (L) stainless steel explosion-N unmarked, non-explosion-proof pressure levels N General (see Table 2) H (x) high pressure (see Table 2) Note: DN15 ~ DN40 conventional threaded connection, such as hope flange connection, the "nominal size" after adding "(FL)"