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；工作可靠

，維護(hù)量小

，壽命長

；對于直管段要求不高

；較寬的流量比10：1

；雙行大液晶顯示

，可選現(xiàn)場瞬時(shí)/累計(jì)流量顯示

，可帶背光單軸靈敏指示

；非接觸磁耦合傳動(dòng)

；全金屬結(jié)構(gòu)

，該流量計(jì)適于高溫

、高壓和強(qiáng)腐蝕性介質(zhì)

；可用于易燃

、易爆危險(xiǎn)場合

；可選二線制、電池

、交流供電方式

；多參數(shù)標(biāo)定功能

；帶有數(shù)據(jù)恢復(fù)

，數(shù)據(jù)備份及掉電保護(hù)功能

。">Applicable to DN200 within the small caliber and low flow velocity measuring medium; a small amount of maintenance, reliable work, long service life; for the straight pipe is not high; the wide flow ratio 10:1; double large LCD display, optional field instantaneous / total flow rate display, backlight can be single axis sensitive indicator; non contact magnetic coupling transmission all metal structure; the flowmeter is suitable for high temperature and high pressure and strong corrosive medium; can be used in flammable and explosive occasions; optional two-wire, batteries, AC power supply; the function of calibration parameters; with data recovery, data backup and power-off protection function.

、工作原理：">Second, working principle:

，浮子便上升

，環(huán)隙面積就隨之增大

，環(huán)隙處流體流速立即下降

，浮子上下端差壓降低

，作用于浮子的上升力亦隨著減少

，直到上升力等于浸在流體中浮子重量時(shí)

，浮子便穩(wěn)定在某一高度

。">ZW-LZ series display type metal tube rotameter is the medium to be measured through a conical measuring tube float from upper and lower ends of the differential pressure generated form the upward force, when the float was immersed in a fluid on the lift is greater than the weight of the float, the float will rise, annulus area increases, the annulus fluid velocity decreased immediately float on the lower end of the differential pressure is reduced, to float upward force also decreases with, until the lift is equal to the weight of the float when immersed in a fluid, the float will stabilize at a certain height. The float position that corresponds to the size of the measured medium flow. ，在浮子隨介質(zhì)上下移動(dòng)時(shí)

，磁場隨浮子的移動(dòng)而變化

。">A built-in magnet, the float with the medium moves up and down, with the movement of the float magnetic field changes.

，由就地指示器中的旋轉(zhuǎn)磁鋼與浮子內(nèi)磁鋼耦合

，而發(fā)生轉(zhuǎn)動(dòng)，同時(shí)帶動(dòng)指針

，通過刻度盤指示出此時(shí)的流量大小

。">A, for in situ, by rotary magnetic float and the local indicator in the inner magnetic coupling, rotate, and drives the pointer, through the dial indicates the size of the flow.

、對于智能型，由智能型指示器中的一個(gè)固態(tài)磁傳感器將磁場的變化轉(zhuǎn)化成電信號

，經(jīng)A/D變換

、微處理器

，D/A輸出

，LCD液晶顯示

，來顯示出流量的大小及累積流量

。">B, the intelligent, by a solid state magnetic sensor intelligent indicator in the magnetic field will change into electrical signal output by A/D transform, D/A microprocessor, LCD liquid crystal display to show the size and cumulative flow flow.

、應(yīng)用場合：">Third, application:

ZW-LZ series display type metal tube rotameter is the industrial automation process control used in a variable area flow meter. ，檢測范圍大

，使用方便等特點(diǎn)

。">It has the advantages of small volume, large detection range, easy to use. 、氣體以及蒸汽的流量

，特別適宜低流速小流量的介質(zhì)流量測量。">It can be used to measure the liquid, gas and steam flow, especially suitable for medium and small flow and low velocity flow measurement. 、化工

、發(fā)電

、制藥、食品

、水處理等復(fù)雜

，惡劣環(huán)境條件

，及各種介質(zhì)條件的流量測量過程中

。">Widely used in petroleum, chemical, power, pharmaceutical, food, water treatment and other complex, harsh environmental conditions, the flow measurement process and various medium conditions in.

Fourth, the main features:

、全金屬結(jié)構(gòu)設(shè)計(jì)

，堅(jiān)固

、簡潔

、耐高壓

、耐高溫

、防腐

、使用壽命長

；">1, all metal structure design, strong, simple, high pressure resistance, high temperature resistance, corrosion resistance, long service life;

、短行程

，總高250mm

，安裝方便

；">2, a short trip, the total height of 250mm, easy to install;

，LCD液晶顯示瞬時(shí)流量、累積流量

；">3, mechanical pointer instructions LCD liquid crystal display instantaneous flow, instantaneous flow, cumulative flow;

、智能型指示器

，采用國外信號采集處理芯片，模塊化設(shè)計(jì)

，無磁滯后

；">4, intelligent indicator, using foreign signal processing chip, modular design, no hysteresis;

、數(shù)據(jù)備份

、掉電保護(hù)及錯(cuò)誤自診斷功能

；">5, data recovery, data backup, power down protection and fault self diagnosis function;

、HART型指示器

，二線制24VDC供電

，4-20mA標(biāo)準(zhǔn)電流信號輸出疊加HART協(xié)議；">6, HART type indicator, two-wire 24VDC power supply, 4-20mA standard current signal output of HART protocol stack;

、通過HART通訊手操器可進(jìn)行參數(shù)組態(tài)和現(xiàn)場調(diào)整；">7, through the HART communication manipulator configuration and parameters can be adjusted;

、與PC機(jī)串口連接

，通過Windows程序，實(shí)現(xiàn)現(xiàn)場對儀表進(jìn)行標(biāo)定

；">8, with the PC serial connection, through the Windows program, to achieve on-site calibration of the instrument;

、可用于易燃、易爆危險(xiǎn)場合；">9, can be used in flammable and explosive occasions;

、垂直

、水平

、上進(jìn)下出

、底進(jìn)側(cè)出、側(cè)進(jìn)側(cè)出等多種安裝形式

，法蘭或螺紋連接

。">10, vertical and horizontal, upper lower, bottom side, side into the side such as the installation of a variety of forms, flange or threaded connection.

、技術(shù)參數(shù)：">Fifth, technical parameters:

、測量范圍：水2.5～100000l/h（20℃）；">1, water measuring range: 2.5 ~ 100000l/h (20 C);

、量程比：10:1

；">2, range: 10:1;

、精度等級：1.0

、1.5、2.5">3, 1.0, 1.5, precision grade: 2.5

、工作壓力：DN15

、DN25

、DN50為PN4.0MPazui大為10.0MPa

、DN80

、DN100為PN1.6MPazui大為6.4MPa

；">4, working pressure: DN15, DN25, DN50 PN4.0MPazui 10.0MPa, DN80 DN100, PN1.6MPazui 6.4MPa;

、介質(zhì)溫度：-40℃～300℃；">5, medium temperature: -40 to 300 DEG c;

、介質(zhì)粘度：DN15：η<5mPa·s（F15.1～F15.3）；η<30mPa·s（F15.4～F15.8）；">6, medium viscosity: DN15: <5mPa - s eta (F15.1 ~ F15.3); s (F15.4 <30mPa F15.8);

DN25: <250mPa - s.

；">DN50: <300mPa - S - DN150;

；指針型：-40℃～120℃；">7, the ambient temperature: LCD type: -40 to 85 DEG C; pointer type: -40 to 120 DEG c;

、連接形式：法蘭（執(zhí)行標(biāo)準(zhǔn)DIN2501或按用戶提供法蘭標(biāo)準(zhǔn)制造）">8, connection: flange (executive standard DIN2501 or as required by standard flange manufacturing)

9 meter height: 250mm

、電纜接口：M20*1.5">10, cable interface: M20*1.5

11, power supply: 24VDC two-wire 4 ~ 20mA or 85 ~ 265VAC 50/60Hz (remote type)

。">12, alarm output: alarm relay output lower or upper limit of instantaneous flow (contact capacity Zui 5A-250VAC) or open collector output (internal impedance Z 100mA-30VDC 100 ohm).

、脈沖輸出：累積脈沖輸出

，zui小間隔每10秒一個(gè)脈沖（交流型）或每50毫秒一個(gè)脈沖。">13, the cumulative output pulse: pulse output, Zui interval of every 10 seconds a pulse (AC) or a pulse every 50 milliseconds.

、液晶顯示：雙排液晶顯示，顯示瞬時(shí)流量及累積流量

。">14, double liquid crystal display: LCD display, display the instantaneous flow and cumulative flow.

。">15: Exia II CT4, explosion-proof.

、測量管材質(zhì)：316不銹鋼（普通型）或內(nèi)襯聚四氟乙烯（防腐型）。">16, the measuring tube material: 316 stainless steel (common type) or Teflon liner (corrosion type).

、結(jié)構(gòu)分類說明：">Six, structure classification:

、高溫型結(jié)構(gòu)(G型)">1, the high temperature structure (G type)

High temperature structure type (G type) is used for medium temperature is too high or too low and the need to take measures on the insulation of the measuring tube medium flow measurement.

，保證指示器工作在允許的環(huán)境溫度范圍內(nèi)

。">The high temperature structure is increased and the distance between the measuring tube indicator to increase heat dissipation and increase the insulation thickness, ensure the working environment temperature indicator in the allowable range. The selection of the "G" type.

The flow of G type metal tube flowmeter can measure the temperature of -80 DEG -+300 DEG medium.

The structure of 2, with a damper device (Z type)

。">Damper structure type flowmeter for entrance flow (pressure) medium flow measurement is unstable, especially for gas measurement.

3, jacket type structure (T type)

。">Jacket structure for heating or cooling of needs (such as high viscosity and flow measurement of the medium Yi Jiejing). ，使流體不汽化和不結(jié)晶。">In the jacket by heating or cooling medium, the fluid does not vaporize and crystallization.

Import and export with thermal medium connection standard to use HG20594-97 DN15 PN1.6 flange, flange connection and other specifications may be marked with production plant, pressure rating jacket for 1.6MPa.

、外形尺寸。">Jacket structure size FA standard flow meter, flange type flowmeter.

、高壓型結(jié)構(gòu)(Y型)">4, high pressure type structure (Y type)

High pressure type structure for media pressure is greater than the standard pressure level measurement.

。">At present, Zui high pressure can reach 32MPa. In addition high pressure type flowmeter can provide built-in magnetic filter type, installation height is 350mm.

、FB和FC型zui大壓力為10MPa。">FA, FB and FC type Zui high pressure 10MPa.

、產(chǎn)品維護(hù)：">Seven, product maintenance:

，管道內(nèi)不可避免會(huì)有鐵磁性雜質(zhì)吸附在浮子上，這樣會(huì)將浮子卡死或影響測量精度

，要時(shí)常對傳感器內(nèi)浮子進(jìn)行清洗

；如果安裝磁過濾器

，也要進(jìn)行定期清洗。">1, in the process of long-term use, the pipeline inevitably there will be ferromagnetic impurity adsorption on the float, it will float stuck or affect the measurement accuracy, from time to time to clean the sensor float; if the installation of magnetic filters should be cleaned regularly.

，儀表接線或拆卸殼體后，要將螺釘旋緊

，須***保證殼體的密封性，防止雜質(zhì)

、水或其它物質(zhì)進(jìn)入

，同時(shí)還要保證儀表殼體的可靠接地

。">2, the instrument indicator with electronic components, instrument wiring or demolition of housing, to housing screws, must ensure sealing, prevent impurities, or other material into the water, and also to ensure reliable earthing of the meter casing.

、儀表安裝后

，在*次使用時(shí)

，要注意：">3, the instrument is installed, in use, should pay attention to:

，造成儀表的損壞

，一定要緩慢地打開閥門！">When the valve is opened to avoid the formation of pressure shock makes the float slamming limiting device, causing damage to the instrument, slowly open the valve!

，以z大程度的減小浮子的震蕩；為確保浮子的穩(wěn)定性，可以在儀表的出口安裝一節(jié)流閥

。">The measurement of gas meter is equipped with gas damper, Z to decrease the float concussion; to ensure the stability of the float, a throttle valve can be installed in the instrument export.

、對于遠(yuǎn)傳型儀表

，首先要保證儀表的接線正確后

，方可通電；對于危險(xiǎn)場合

，須***選擇防爆型

，并按防爆要求進(jìn)行安裝使用。">4, for the remote type instrument, we must first ensure that the instrument wiring correctly, keeps power; for dangerous situations, must choose the explosion-proof, and the installation and use of proof required by the.

、故障排除方法：">Troubleshooting eight fault:

Set alarm 1, check the SU in size.

。">2, check the deviation set D value can not be too large.

、FUN功能中，邏輯功能是否正確

。">3, FUN function, logic function is correct. HA-A said the upper limit is logical. LA-A said the lower limit is.

、線路板故障，更換線路板

。">4, circuit board failure, replace the board.

、若液晶條碼指示正確，輸出無動(dòng)作，可檢查外部電源及外部電源的負(fù)極是否與儀表供電的負(fù)極相連。">5, if the lcd barcode indicates the correct output, no action, the cathode can check the external power and external power supply is connected with the anode of instrument power supply.

。">If the wobble in use, according to the jitter amplitude to determine what kind of amplitude jitter. 。">Divided into mild and moderate jitter jitter jitter and jitter.

、輕微抖動(dòng)：一般由于介質(zhì)波動(dòng)引起。">1, a slight jitter due to fluctuations caused by the media. 。">Can be used to increase the damping of the way to overcome.

、中度抖動(dòng)：一般由于介質(zhì)流動(dòng)狀態(tài)造成。">2: general, moderate jitter caused by medium flow state. 。">For general gas as the medium pressure instability caused by. 。">The regulator or stabilizer to overcome or increase the damping of gas meter.

，氣壓不穩(wěn)或用戶給出的氣體操作狀態(tài)的壓力

、溫度、流量與儀表實(shí)際的狀態(tài)不符

，有較大差異造成儀表過量程

。">3, severe jitter: mainly due to medium gas pulsation, operation pressure instability or give users pressure, temperature, flow meter and the actual state does not have large differences over range instrument.

Ninth, the installation should follow the following steps:

、在安裝到工藝管道之前

，應(yīng)拆卸所有安裝并檢查有沒有運(yùn)輸損壞；">1, before installation to process piping, should remove all installed and checked for any transport damage;

，不要指針位置變化

；">2, in order to prevent in transit, with a rubber band fixed pointer indicator, indicator should open the left cover it gently removed before connection, do not change the pointer position;

，電纜線穿過電纜引入裝置后

，按旋轉(zhuǎn)角變送器的接線圖接線后，旋緊壓螺母

，使電纜固定

，然后旋緊左右蓋的緊固螺釘，使指示器防水防塵

；">3, open the indicator of the right cover, cable through the cable introducing device, according to the wiring diagram wiring rotation transmitter, pressure screw nut, the cable is fixed, and then tighten the fastening screws around the cover, the indicator of waterproof and dustproof;

、儀表的上下游管道應(yīng)與儀表的口徑相同,連接法蘭或螺紋應(yīng)與儀表的法蘭和螺紋匹配，儀表上游直管段長度應(yīng)保證是儀表公稱口徑的5倍

，下游直管段長度h2不少于250mm

；">The upstream and downstream pipeline 4, instrument and instrument should be the same caliber, flange or threaded connection should be matched with the flange and screw instrument, instrument upstream straight pipe length should ensure that the instrument is 5 times the nominal diameter, downstream straight pipe length not less than H2 250mm;

，所以為了保證浮子流量計(jì)的性能

，傳感器的安裝周圍至少100mm處，不允許有鐵磁性物質(zhì)存在

；">5, due to the use of the instrument measuring mechanism is magnetic transfer, so in order to ensure the performance of rotameter installed around the sensor, at least 100mm, the existence of ferromagnetic material is not allowed;

、儀表安裝前,工藝管道應(yīng)進(jìn)行吹掃，防止管道中滯留的鐵磁性物質(zhì)附著在儀表里

，影響儀表的性能

，甚至?xí)p壞儀表.如果不可避免，應(yīng)在儀表的入口安裝磁過濾器

；">6 before installation, instrumentation, piping should be purged, prevent the retention of ferromagnetic material in the pipeline is attached to the instrument, the instrument performance, or even damage the instrument. If unavoidable, should be installed at the entrance of the magnetic filter instrument;

、測量氣體的儀表,是在特殊壓力下的校準(zhǔn),如果氣體在儀表的出口直接排放到大氣，將會(huì)在浮子處產(chǎn)生壓降,并引起數(shù)據(jù)失真

。">7, the measurement of gas meter is calibrated in special pressure, if the gas meter in the outlet directly discharged into the atmosphere, will produce a pressure drop in the float, and lead to data distortion.

，應(yīng)在儀表的出口安裝一個(gè)閥門，以便能對所需流量值進(jìn)行設(shè)定

，當(dāng)浮子上維持標(biāo)校壓力時(shí)

，氣體將在閥門處膨脹；">If this is the working conditions, should install a valve in the instrument exports, so that the required flow value is set, when the float to maintain calibration pressure, gas expansion in valve;

、儀表的安裝形式分為垂直安裝和水平安裝

，如果是垂直安裝形式，應(yīng)保證儀表的直度優(yōu)于1%

；如果是水平安裝形式應(yīng)保證儀表的水平度優(yōu)于1%

；">The installation form 8, instrument installation for vertical and horizontal installation, if it is installed in a vertical straight form, should ensure that the instrument is better than 1%; if the level of installation form should ensure that the level of instrument is better than 1%;

、安裝在管道中的儀表不應(yīng)受到應(yīng)力的作用，儀表的出口和入口應(yīng)有合適的管道支撐,可以使儀表處于z小應(yīng)力狀態(tài)

；">9, installed in the pipeline in the instrument should not be subject to stresses, the instrument should be a proper entrance and exit pipe support, can make the instrument in z stress state;

，須***在安全場所進(jìn)行

。">10, product and computer related to calibration and other operations, must be in a safe place.

10, installation notes:

，管道應(yīng)進(jìn)行吹掃

，防止雜質(zhì)損壞儀表。">1. before installation, pipeline sweeping shall be carried out to prevent impurities, damage the instrument. ，推薦在儀表的入口安裝磁過濾器

；">In order to ensure the normal use of the instrument, the recommended magnetic filter installed in the instrument entrance;

；">2. measurement easily crystallized medium should be used with jacket type heat;

；">3. installed horizontally or vertically when the inclination angle of not more than 2 degrees;

4. measuring pipe is not allowed in a magnetic material;

，盡量保證前面5倍的管徑長度

，后面2倍的管徑長度；">5. on the downstream piping should be the same with the meter diameter, try to ensure the front 5 times diameter length, diameter 2 times the length of the back;

，安裝時(shí)不能用力過猛

，以免損壞四氟襯里；">6. meter anticorrosive PTFE lining, the installation can not overexert, so as not to damage the PTFE lining;

，注意排除外力干擾

；">To avoid the stress of the 7. meter is installed, pay attention to eliminating external interference;

；">8. meter with liquid crystal display to avoid direct sunlight, so as not to affect the service life of the flowmeter;

，應(yīng)在流量計(jì)的后面安裝閥門，以增加背壓

，避免流量計(jì)讀數(shù)偏低現(xiàn)象的出現(xiàn)

。">The float flowmeter in the pipeline at the end of the metal tube 9. for installation, should be installed in the valve flow back, to increase the pressure, to avoid the phenomenon of a low flow meter reading.

Eleven, the measuring range and the pressure loss:

Decay path	Common path	measuring range		Zui high pressure loss
DN (mm)	DN (mm)	The air (m3/h)	Water (L/h)	The air (KPa)	Water (KPa)
Fifteen	Fifteen	0.05-0.5	1.6-16	Seven	Six point four
		0.07-0.7	2.5-25	Seven point one	Six point five
		0.11-1.1	4.0-40	Seven point two	Six point five
		0.18-1.8	6.0-60	Seven point three	Six point six
		0.28-2.8	10-100	Seven point five	Six point six
		0.40-4.0	16-160	Eight	Six point eight
		0.70-7.0	25-250	Ten point eight	Seven point two
		1.00-10	40-400	Ten	Eight point six
		1.60-16	60-600	Fourteen	Eleven point one
Twenty-five		-	80-800	-	Fourteen
	Twenty-five	3.00-30	100-1000	Seven point seven	Seven
		4.50-45	160-1600	Eight point eight	Eight
		7.00-70	250-2500	Twelve	Ten point eight
		11-110	400-4000	Nineteen	Fifteen point eight
Fifty		-	500-5000	-	Sixteen point two
	Fifty	18-180	600-6000	Eight point six	Eight point one
		25-250	1000-10000	Ten point four	Eleven
Eighty		40-400	1600-16000	Twelve point six	Seventeen
Eighty	Eighty	50-500	2000-20000	Fifteen point five	Six point three
One hundred	Eighty	75-750	2500-25000	Seventeen Point Two	Eight point one
One hundred	One hundred	100-1000	4000-40000	-	Nine point five
One hundred and twenty-five	One hundred	160-1600	6000-60000	-	Ten
One hundred and twenty-five	One hundred and twenty-five	250-2500	8000-80000	-	Sixteen
One hundred and fifty	One hundred and twenty-five	-	10000-100000	-	Twenty
One hundred and fifty		300-3000	12-120m3/h	-	Twenty
		400-4000	15-150m3/h	-	Twenty-five

、選型編碼：">Twelve, the selection of encoding:

Specification code				Encoding instructions
The name of the factory	ZW			Zhongwei control
Instrument types		LZ		Metal tube rotameter
structural style		/		In the next
		H1		The left into the right
		H2		Right into the left out
		AA		The side into the side
		LA		The bottom side
		S		Threaded connection
		M		Clamp connection (sanitary polishing tube)
Size code		- XXX		Cases: Fifteen Express DN15
The measuring tube material		R1		1Cr18Ni9Ti ，">, Three hundred and four
		R0		0cr18Ni12M02Ti , Three hundred and sixteen
		RL		316L
		RP		(PTFE F-lined )
		Ni		(Hasloy Hastelloy C)
		Ti		(TitHXium titanium alloy )
Media type		L		liquid
		G		Gas
working temperature		H1		- 40 C -100 C
		H2		- 80 C -250 C
Rated pressure		One point six		1.6MPa
		Four		4.0MPa
		Sixteen		16MPa
		Twenty-five		25MPa
Additional structure		O		nothing
		Z		Damping type
		T		Jacket
		H		High temperature type
		Y		High pressure type
Form indicator			M1	Local indication
			M2	Intelligent
			M3	Intelligent ( Flameproof )
The output signal in the communication			N	nothing
			A	4-20mA
			H	4-20mA+Hart
Alarm controller			K1	The upper limit alarm
			K2	Alarm
			K12	、下限報(bào)警">The upper and lower limit alarm
Explosion proof type			E1	Intrinsically safe EX IaCT5 Square shell
			E2	Flameproof EXiibt4 Park Housing
Power supply			Zero	24VDC (can be omitted )
			Two	220VAC
			Three	Three point six Volt lithium battery

、設(shè)計(jì)選用及訂貨須知：">Thirteen, design selection and ordering information:

、壁厚

、材質(zhì)要求

、精度要求；">1, please provide the pipe size, wall thickness, material requirements and accuracy requirements;

、請?zhí)峁┮后w或氣體狀況

，如名稱，常用溫度

，常用工作壓力

，常用流量，密度

，粘度等

；">2, please provide a liquid or gas, such as the name, commonly used commonly used temperature, working pressure, common flow, density, viscosity etc.;

，應(yīng)注明被測腐蝕性介質(zhì)和濃度百分比等

；">3, choose anti-corrosion type, should indicate the measured corrosion and concentration etc.;

，請與我公司銷售部聯(lián)系

。">4, if there are special to show, please contact our sales department.

Customer service service commitment:

，負(fù)責(zé)免費(fèi)維修

。">1, our series of metal tube flowmeter series product quality problems within twelve months, responsible for free maintenance.

，我公司負(fù)責(zé)免費(fèi)維修或更換

。">2, the warranty period if the products of our company have any quality problems, our company is responsible for free repair or replacement.

，造成產(chǎn)品損壞

，我公司負(fù)責(zé)維修，收取損壞部件成本費(fèi)

。">3, the warranty period if the user use undeserved, cause damage to the product, our company is responsible for the maintenance, collect the damaged parts cost.

、質(zhì)保期后產(chǎn)品出現(xiàn)質(zhì)量問題，我公司負(fù)責(zé)維修

，收取損壞部件成本費(fèi)

。">4, after the warranty period of product quality problems, our company is responsible for the maintenance, collect the damaged parts cost.

，對省內(nèi)用戶我公司服務(wù)人員12小時(shí)內(nèi)到達(dá)現(xiàn)場

，省外用戶48小時(shí)內(nèi)到達(dá)現(xiàn)場。">5, if the user needs to our service, our company in the province of the user service personnel arrived at the scene within 12 hours, arrived at the scene 48 hours outside users.

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Local display type metal tube rotameter

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