Basic parameters of flowmeter

Execution standard for sewage pipeline flowmeter	Turbine flow sensor (JB/T9246-1999)
Instrument caliber and connection method	4. 6, 10, 15, 20, 25, 32, 40 are connected by threads (15, 20, 25, 32, 40) 50, 65, 80, 100, 125, 150, 200 are connected by flanges
accuracy class	± 1% R, ± 0.5% R, ± 0.2% R (customized)
Range ratio	1:10；1:15；1:20
Sensor material	304 stainless steel, 316 (L) stainless steel, etc
Conditions for using sewage pipeline flow meters	Medium temperature: -20 ℃~+120 ℃ Environmental temperature:- 20℃～+60℃ Relative humidity: 5%~90% Atmospheric pressure: 86KPa~106KPa
Signal output function	Pulse signal, 4-20mA signal
Communication output function	RS485 communication, HART protocol, etc
Working power supply for sewage pipeline flowmeter	A. External power supply:+ 24VDC ± 15%, ripple ≤ ± 5%, suitable for 4-20mA output, pulse output, RS485, etc B. Internal power supply: 1 set of 3.0V10AH lithium batteries, which can work normally when the battery voltage is between 2.0V and 3.0V.
Signal line interface	Basic type: Hosman connector or built-in three core cable; Explosion proof type: Internal thread M20 × 1.5
Explosion proof grade	ExdIIBT6 or ExdIICT4
protection grade	IP65 or higher (customizable)

Sewage pipeline flowmeter is mainly used for measuring thermal oil, hydraulic oil, diesel, heavy oil, compressor oil, coal gas, nitrogen, natural gas, etc.
2、 Working principle of flowmeter
The turbine inside the sensor rotates under the action of fluid, causing a change in the magnetic field of the signal detector. Therefore, an alternating voltage is induced in the coil of the signal detector, which is amplified, filtered, and shaped by an amplifier to output a square wave signal.Circulating water flowmeterThe frequency of this signal voltage is directly proportional to the speed of the impeller, that is, directly proportional to the flow rate (velocity) of the fluid.

3、 Design Features of Flow Meter
The JKM-LWGY flowmeter adopts a fully cemented carbide (tungsten carbide) shielded cantilever beam structure bearing, which integrates a rotating bearing and a pressure bearing, greatly improving the bearing life and can work in media with small amounts of sediment and dirt. The sensor adopts a stainless steel structure (impeller adopts 2Cr13 or duplex steel wheel) with good corrosion resistance. It uses ruby bearings and hard alloy (LT6) shaft sleeves to ensure the service life and long-term stability of the turbine sensor. Samarium cobalt permanent magnet alloy is used as the signal detector, with strong output signal and good magnetic stability, and can work normally in media ranging from 0-120 ℃. The flowmeter itself has a self rectifying structure, which is small, lightweight, and has a simple structure,Circulating water flowmeterIt can be assembled and disassembled in a short period of time, making installation and use quite convenient.
4、 Pipeline flowmeter
Technical performance: Pipeline flow meters can be calibrated using real flow for hydraulic oil, engine oil, and small-diameter specifications with high viscosity.

Diameter of pipeline flowmeter instrument (mm)	Normal flow range (m3/h)	Expand flow range (m3/h)	Conventional withstand pressure (MPa)	Specially designed pressure resistance level (MPa) (flange connection method)
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 (flange)	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
DN 150	30~300	15~300	1.6	2.5, 4.0
DN 200	80~800	40~800	1.6	2.5, 4.0

5Circulating water flowmeterModel and specification code table

model		Specification code		describe
JKM-LWGY				Circulating water flowmeterTurbine flow meter
	G			sensor
		Q		gas
		Y		liquid
Circulating water flowmeterNominal Diameter			-2	2mm (pipe thread G3/8 ")
			-4	4mm (pipe thread G1/2 ")
			-6	6mm (pipe thread G1/2 ")
			-10	10mm (pipe thread G1/2 ")
			-15	15mm (flange type or pipe thread connection G1 ")
			-25 -32	25mm (flange type or pipe thread connection G11/4 ") 32mm (flange type or pipe thread connection)
			-40	40mm (flange type or pipe thread connection)
			-50 -65	50mm (flange type) 65mm (flange type)
			-80	80mm (flange type)
			-100 -125	100mm (flange type) 125mm (flange type)
			-150	150mm (flange type)
			-200	200mm (flange type or plug-in type)
			-250	250mm (flange type or plug-in type)
			-300	300mm (flange type or plug-in type)