Product Code: DT-LWQ Product Name: DT-LWQ gas turbine flowmeter product categories: a gas turbine flowmeter Product Overview LWQ type gas turbine flowmeter is an accurate measurement of gas flow velocity flow meter, a simple and lightweight , high accuracy, good reproducibility, wide measuring range, easy installation and maintenance. Widely used in measuring petroleum, chemical, metallurgy, aviation, research and other departments and industrial areas a variety of gases, such as natural gas, city gas, propane, butane, air, nitrogen and other gases. Due to the high meter accuracy, good repeatability, it applies to trade measurement and industrial process monitoring. Gas turbine flowmeter line measurement, its medium density with temperature and pressure changes, the accurate measurement of temperature and pressure must track detection medium, and under different conditions in terms of volume flow standard state or state convention The volume flow. Since the flowmeter set temperature, pressure, flow sensors in one, online tracking and detection medium temperature and pressure and automatically compensates for compression factor correction operation, so it has excellent low and high pressure measurement of performance, especially for all kinds of single-phase gas measurement, as precise metering of natural gas and other gases. According to the different requirements of users, total company customer offer different levels of precision turbine flowmeter. Gas turbine flowmeter are explosion-proof products, explosion-proof grade: ExdIIBT6. Gas turbine flowmeter in accordance with power supply, the availability of remote signal output can be divided into DTLWQ- □ B type and DTLWQ- □ C type. Type B: power supply with 3.2V10AH lithium battery (continuous operation for more than 3 years); no signal output. C Type: Power supply with 24VDC external power supply, the output of a standard two-wire 4-20mA current signal, and depending on the site needs, increase the RS485 or HART communication. Second, product characteristics ★ designed specifically for gas metering, high sensitivity, high safety ★ imported high quality bearings, long life ★ metering chamber and the breather chamber cut off to ensure the safety of the instrument can detect ★ gas turbine flowmeter measured gas The temperature, pressure and flow rate, the flow rate can be automatic tracking compensation, and the standard status display (Pb = 101.325KPa, Tb = 29*K) gas volume total; real-time check the temperature and pressure values ??★ wide flow range (Qmax / Qmin ≥20: 1), repeatability, high accuracy (up to 1.0), a small pressure loss, low starting flow rate up to 0.6 m3 / h ★ intelligent instrument coefficient nonlinear multi-point correction ★ built-in pressure, temperature sensors, high safety performance, compact structure, beautiful appearance ★ gas turbine flowmeter with explosion-proof and protection, Ex logo ExdⅡBT6, ExiaⅡCT6, protection class IP65 ★ system low-power operation, a lithium battery can be used continuously for 3 3.2V10AH ★ meter factors over years, the cumulative flow value brownout 3 years is not lost. Technical parameters: 3.1 Basic parameters: 3.1.2 Accuracy class: 1.0, 1.5 ★ condition: Ambient temperature: -30 ℃ ~ + 60 ℃; · Atmospheric pressure: 86KPa ~ 106KPa; · Media temperature: -30 ℃ ~ + 80 ℃; · Relative humidity: 5% to 95% Third, the main features of high a) accuracy, repeatability, low pressure loss, seismic performance; b) the use of high-quality bearings, low friction sealing Well, hand name; c) set microprocessor, flow sensors, high-precision temperature and pressure sensors in one, direct measurement of the measured gas flow rate, temperature, pressure, and flow automatic compensation and compressibility factor correction arithmetic; d) The instrument has a pulse signal, analog signal output, RS485 communication interface, or using GPRS systems, direct centralized management and real-time collection of computer data; low-e) power available in the battery-powered, can also be an external power supply; f) with real-time data storage, which prevents battery replacement or data loss when a sudden power failure, the state power, the internal data can be permanently stored; g) with IC card prepaid system supporting the use, easy to trade settlement; h) explosion-proof products, the proof mark Bit ExibIIBT4, ExibIIBT6 four working principle and application of gas turbine flowmeter measurement using a turbine. It is first converted to a flow rate of the turbine speed, then speed is converted into an electrical signal proportional to flow. This flowmeter for detecting the instantaneous flow rate and total flow totalizer, the output signal frequency, easy to digitize. Figure in the induction coil and the permanent magnet fixed to the housing together. When the ferromagnetic turbine blade through the magnet, the magnetic circuit reluctance changes, resulting in induction signal. Signal is amplified and shaped to the counter or frequency meter, displays the total integrated flow. While the pulse frequency through frequency - voltage converter to indicate flow rate. Impeller speed is proportional to the flow rate, the number of revolutions of the impeller is proportional to the total flows. Output of the turbine meter is the frequency modulated signal, not only to improve the anti-interference detection circuit, and simplifies the flow detection system. Its range of up to 10: 1, accuracy of ± 0.2%. The time constant inertia and small size of the turbine meter up to 0.01 seconds. Gas turbine flowmeter has been widely used in petroleum, organic liquids, inorganic liquid, liquefied petroleum gas, natural gas and cryogenic fluids. Fifth, the technical performance 3.1 Implementation of standards GB / T 18940-2003 "closed pipe flow measurement of gas turbine flowmeter" 3.2 accuracy class 1.0: Qmax-0.2max ± 1.0% 0.2 Qmax-min ± 2.0% 1.5 级: Qmax- 0.2max ± 1.5% 0.2 Qmax-min ± 3.0% not otherwise specified product, manufactured in accordance with 1.5 accuracy, precision rest, when ordering, you need to customize special instructions. 3.3 meter model specifications, the basic parameters Model nominal diameter DN (mm) flow range (m3 / h) maximum pressure loss (kPa) starting flow (m3 / h) Installation LWQ-25 25 2.5-25 1 flange (thread) LWQ-25 4-40 2 flanges (thread) LWQ-40 40 5-50 1.8 flange (threaded) LWQ-50 50 6-65 0.7 2.5 Flange LWQ-50 10-100 0.7 2.5 Flange LWQ -808013-250 0.3 6 flange LWQ-80 20-400 0.8 6 flange LWQ-100 100 20-400 0.2 8 flange LWQ-100 36-650 0.5 8 flange LWQ-150 150 32-650 0.4 15 Flange LWQ-150 50-1000 1.7 15 flange LWQ-200 200 80-1600 0.2 35 flange LWQ-200 130-2500 0.9 35 flange LWQ-250 250 130-2500 0.2 40 flange LWQ-250 200-4000 0.5 50 flange LWQ-300 300 200-4000 1.5 50 3.4 Conditions of Use 3.4.1 Standard flange state conditions: P = 101.325kPa T = 29*k 3.4.2 conditions: a Ambient temperature:. -25 ~ + 80 ℃ b medium temperature:. -20 ~ + 60 ℃ c relative humidity:. 5 ~ 95% d atmospheric pressure:. 86kPa ~ 106Kpa 3.5 electrical performance 3.5.1 Power supply a power supply inside the instrument: Section 1 3.6VDC lithium battery, battery voltage can work in 3.1 ~ 3.6V during normal; b within GPRS Power: Section 1 6.6VDC lithium battery, the battery voltage can work in 5.0 ~ 6.6V when; c external power supply: + 24VDC ± 15%. ripple ≤ ± 5%, applicable to 4 ~ 20mA output, pulse output, RS-485 and so on; d external power supply (solar) GPRS Power:. + 5VDC ~ + 7VDC. 3.5.2 Power consumption: external power supply, <1W inside the instrument power, average power consumption ≤1mW, can work for more than five years. Within GPRS Power: Communication in accordance with the daily average number of times (2-12 times), it can work for one to five years. 3.5.3 Pulse output mode 1) pulse signal :( base table for the calibration of the instrument): Direct the flow sensor detects the base table of the original pulse signal via the amplifier, high ≥20V, low ≤1V. 2) the modified conditions pulse signal (or standard volume flow): set by software, the default is the corrected actual volume flow pulse output amplitude for: high ≥20V, low ≤1V. 3) the equivalent pulse signal (for IC card controller inputs): a.TTL output amplitude 0 ~ 3V, the output pulse width ≥50ms. b.OC output. 3.5.4 Current output: 4 ~ 20mA standard analog current output proportional to the volume flow, 4mA corresponds to 0 Nm3 / h, 20mA corresponds to the maximum standard volume flow rate (the value can be set). Output form: two-wire or three-wire system 3.5.5 RS485 communication through internal RS485 standard interface can be connected to a personal computer and PLC host, serial communications. It can display media pressure, temperature, flow rate, cumulative standard flow, battery voltage. 3.5.6 GPRS communication 1) through embedded GPRS system for serial communication. Control system enables remote meter reading. 2) display media pressure, temperature, flow rate, cumulative standard flow, battery voltage. 3) Display IC card data and control IC card controller to open the valve, close the valve, purchased gas. 3.5.7 Valve control output selectable valve control type, direct control valve, independent control and remote control 3.5.8 Pipeline Pressure Testing Company optional digital pressure sensor, instrumentation before the other side of the regulator or regulator After pressure. 3.5.9 alarm output to connect alarm switch, control valves cut off the gas source, and notice to the management system via GPRS systems. Sixth, Product Selection Table Model Description DTLWQ- □ - □ / □ / □ N type gas turbine flowmeter meter caliber 25A / B / C 25mm 40A / B 40 mm 50A / B 50 mm 80 80 mm 100 100 mm 150 150 mm 200 200 mm 250 250 mm 300 300 mm Sensor material N basic materials, high-quality aluminum. (Maximum pressure: 1.0MPa) S stainless steel. (High corrosion type) A special structure dedicated oxygen structure (de-oiled degreasing) B compressed air special structure (high flow design) seven gas turbine flowmeter installation requirements (1) Gas Turbine Flowmeter are precision measuring instruments, transportation, Care must be taken when handling and warehousing operations. (2) Before the meter into the pipeline, torn adhesive tape flange Import and Export Department, and by blowing means of checking the impeller rotation is smooth and flexible. (3) Before starting the meter installation, especially when installing new pipes or repaired the pipeline, the first line should be cleaned to remove all of the slag, rust and other debris from the pipeline. (4) pipe hydrostatic test, any remaining liquid inside the pipeline would damage the internal parts of the turbine flowmeter. If hydrostatic test is necessary, the turbine meter must be used instead of a pipe section, to ensure that after the hydrostatic test no liquid left in the upstream of the turbine flowmeter in the pipeline. (5) The flow meter should be installed horizontally. Flowmeter with a lubrication system should be installed to ensure the lubrication of bottle opening up. Nominal diameter DN≤200 gas turbine flowmeter can be installed vertically. When installation, flow direction should be from top to bottom. (6) any case, the turbine flow meter should be installed upstream section of the nominal diameter and nominal meter straight pipe of the same diameter, length requirements ≥2DN; while its downstream section of the public said the same diameter as the meter must be installed straight pipe or elbow, and claims the total length ≥2DN. (7) upstream of the inlet pipe in gas turbine flowmeter opening angle diverging tapered tube or pipe can not exceed 30. . In order to ensure the delivery of gas policy to facilitate maintenance of the flow meter, to set the meter bypass pipe installation pipe. (8) Gas turbine flowmeter and pressure should slowly start, quickly open the valve of the shock load often damages the impeller. (9) If you need to do welding work on the pipeline near the turbine flowmeter, turbine flowmeter must be removed to carry out. Otherwise, perineum pipe temperature is too high and cause permanent damage to the meter. (10) When installing gas turbine flowmeter, pay attention to the direction of gas flow is consistent with the direction of the arrow on the case, installation errors can cause damage to the turbine flowmeter. (11) The pipeline must be no shock, the air inside the pipe can not have a big ripple and impurities, dust and liquids, foreign substances entering the pipeline will severely damage the turbine flowmeter, there may be damage to the meter when the gas flow is expected When a foreign substance, it is recommended to install a filter on the upstream pipeline turbine flowmeter. (12) For gas turbine flowmeter is installed outdoors, in order to prevent wind and rain, they should provide appropriate protection measures. Actual flow rate (13) suggested that the gas turbine flowmeter shall within 20% -80% range in the meter maximum rated flow. Gas turbine flowmeter allow short-time overload, but the actual maximum flow rate must not exceed 20% of the gas turbine flowmeter allows maximum flow rate, and duration can not exceed half an hour. (14) connected to the meter installation must ensure that the inlet and outlet coaxial turbine flowmeter alignment, and even force the bolts, so as not to affect the sealing effect. In order to obtain accurate results, we must ensure that no seal from the flange extends into the pipeline.