HP metal tube rotor flowmeter

Overview

Metal tube float flowmeter is a commonly used variable area flow measurement instrument in industrial automation process control. It has the characteristics of small size, large detection range, and easy use. It can be used to measure the flow rate of liquids, gases, and vapors, especially suitable for measuring the flow rate of low velocity and low flow media.

The intelligent metal tube float flowmeter has both local display and intelligent remote transmission types, with pointer display for instantaneous flow, LCD display for instantaneous and cumulative flow, upper and lower limit alarm output, pulse output, and standard two-wire system4 －20mACurrent output,HartProtocol output,ModBusVarious forms such as protocol output provide users with a wide range of choices. In addition, the instrument adopts advanced technology16The microprocessor and high-quality industrial components ensure the excellent performance of the flowmeter in various application scenarios.

According to the different structures of the measuring tubes, the metal tube float flowmeter is divided into bottom in and top out, bottom in and top out, bottom in and top out, bottom in and top out, right in and left out, left in and right out, and top in and bottom out types. Users can choose different forms of measuring tubes according to their different requirements, which is very convenient for maintenance and cleaning. On this basis, various forms of measuring tubes can be equipped with intelligent metal tube float flowmeter indicators with independent intellectual property rights to form intelligent metal tube float flowmeters, among which the indicators have been patented by the country.

For many years, the metal tube float flowmeter has been widely favored by industries such as petrochemicals, steel, electricity, metallurgy, light industry, food, pharmaceuticals, and water treatment due to its excellent performance and reliability, as well as good cost-effectiveness.

Main Features

◆ Suitable for flow measurement of small caliber and low velocity media

◆ Reliable work, minimal maintenance, and long lifespan

◆ Not high requirements for straight pipe sections

◆ Wide traffic ratio10:1Special type:20:1

◆ Dual row large LCD display, capable of displaying both instantaneous and cumulative flow simultaneously, with backlight capability

◆ Single axis sensitive indication

◆ Non contact magnetic coupling transmission

◆ All metal structure, suitable for high temperature, high pressure, and highly corrosive media

◆ Can be used in flammable and explosive hazardous environments

◆ Optional two-wire system, battery, AC power supply mode

◆ Multi parameter calibration function

◆ Equipped with data recovery, data backup, and power down protection functions

Structure and Working Principle

1. Structure

This series of metal tube float flowmeters is implemented in ChinaJB/T6844-1993national standard. The product mainly consists of two parts:Measuring tubes and indicators. The measuring tube includes conical tube or orifice plate, guide, stopper, float and other components, and the indicator includes magnetic follow-up system, pointer, dial, circuit board (remote transmission) and other components.

2Working principle

When the measured medium flows through the float of the measuring tube from bottom to top, a differential pressure is generated at the upper and lower ends to form an upward force. When the upward force on the float is greater than the weight of the float immersed in the fluid, the float rises and the annular gap area increases accordingly. The fluid flow velocity at the annular gap rapidly decreases, and the differential pressure between the upper and lower ends of the float decreases. The upward force acting on the float decreases until the upward force is balanced with the weight of the float immersed in the fluid. The float stabilizes at a certain position, and the height of the float position corresponds to the flow rate of the measured medium. The float is equipped with magnetic steel, and when the float moves up and down with the medium, the magnetic field changes with the movement of the float.

aOn site type, the follower magnet in the on-site indicator is coupled with the magnet inside the float to rotate, while driving the pointer to indicate the current flow rate through the dial. (As shown in the following figure)aAs shown)

bIntelligent remote transmission type, coupled with the moving magnetic steel in the intelligent indicator and the magnetic steel inside the float, rotates and drives the sensing magnetic steel and pointer. The magnetic field changes are converted into electrical signals through the magnetic sensorA／DTransformation, digital filtering, temperature compensation, microprocessor processingD／AOutputLCDLCD display is used to show the instantaneous flow rate and cumulative flow rate. (as follows)bAs shown in the figure)

imagea

imageb

Main technical parameters

◆ measurement range: Water（20℃）1-200000 l／h

air20℃，0.1013MPa）0.03－6000m3／h

(Refer to the flow chart, special flow rates can be customized)

◆ Range ratio: standard form10:1Special type20:1

◆ accuracy: standard form1.5 Special Type1.0 level

◆ Pressure rating: Standard type:DN15－DN50≤4.0MPa DN80-DN200≤1.6MPa

◆ Special type: DN15-DN50≤32MPa

DN80-DN200≤16MPa

The pressure level of the jacket is1.6MPaSpecial types should be negotiated with the factory before selection and ordering

◆ Pressure loss:7kPa-70kPa

◆ Medium temperature: standard type －40℃-＋100℃; PTFE：0℃－100℃

high-temperature type 110℃-450℃

◆ Medium viscosity:DN15:or<5mPa.s(F15.1-F15.3)

or<30mPa.s(F15.4-F15.8)

DN25:or<250mPa.s

DN50-DN200:or<300mPa. s

◆ Environmental temperature: Remote transmission type: -40℃－+85℃ (LCD will not be damaged), LCD works normally in-30℃－+80℃

Local pointer type: -40℃－+100℃

◆ Connection form: Standard type:DIN2501Standard flange

◆ Special type: Any standard flange or thread specified by the user

◆ Cable interface: Explosion proof type1/2NPTInternal thread, otherM20＊1.5internal thread

◆ Power supply: Standard type:24VDCtwo-wire system4－20mA（12VDC－32VDC）

Alarm type:24VDCfour-wire system4－20mA（18VDC－28VDC）

Communicative type:85－265VAC 50Hz

Battery type:3.6V@7.5AHLithium battery, capable of continuous use for three years

◆ Load characteristics: Two wire system:RLmax=50*(power supply voltage-12)Ω=600Ω@24V

Multi wire system: The maximum load resistance is500Ω

◆ Alarm output: upper or lower limit instantaneous flow alarm

Dry reed switch alarm (contact capacity)1A@30VDC）

Relay output (contact capacity)1A@30VDCor0.25A@250VACor0.5A@125VAC）

◆ Pulse output: Accumulated pulse output, minimum interval50 millisecond

(Open collector output, maximum load capacity)100mA@30VDCInternal impedance100 Ω)

◆ LCD display: Instantaneous flow display value range:0－50000(Can include decimal point)

Accumulated traffic display value range:0－99999999(Can include decimal point)auto-reset

◆ Protection level:IP65

◆ Explosion proof mark: intrinsic safety typeExiaⅡCT5Certificate number:CE062002Explosion proof typeExdⅡBT6Certificate number:CE051423

◆ Instrument installation height:DN15-DN200Standard vertical height250mm，＞DN80Caliber high-pressure instrument height350mm