Target Flowmeter Catalog.Z100TF Dalian Zero Instrument Technology Co., Ltd China

ZERO100TF Target Flow meter

Catalog

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1. Introduction 1) Category and applications Based on the measurement theory of flow meter, ZERO instrument developed a series of novel pressure influence target mode flow meters which utilize the modern sensor and computer technology. They have not only immovable characteristics such as of the Target Flow meter, Hole Board Flow meter and Turbine Flow meter, but also measure accuracy comparable to Cub age Flow meter. Since their characteristic of anti-interfere, anti-impurity, portability and reliability, they have been widely used in many fields of petroleum, chemical industry, energy, foodstuff, environment protection, water conservancy and so on. The flow meters are applicable to the following ranges:: 

Diameter ,Φ15～Φ2000mm or bigger.



High and low temperature, -196 -196 ℃～+450℃.



High pressure pressure : 0 ～42Mpa.

2) Characteristics Characteristics 

Measurement flow of liquid, gas, steam, ropy mediums or ambulatory mediums in low, normal or high temperature condition.



Total Total quantity measurement accuracy accuracy is not less than 0.2%.



High sensitivity, able to measure very low velocity below 0.8m/s.



No movable part, part, safe and reliable.



Wide measure range, bigger bigger than 1:30.



Good repeatability, repeatability, generally generally 0.1～0.08% , fast to measure.



Small pressure loss, only about 1/2△P of Standard Hole Board.



Able to adopt hang weight weight method to test the flow meter. meter.



Measurement range can can be changed by replacing target target according to need.



LCD display.



4-20mA, 0-10V, 0-10V, impulse, and RS485 outputs.



Easy installation and maintain. maintain.









2

Struct Structure ure and Princi Principle ple

1) Structure Structure Target Mode Flow meter consists of measure tube, pressure target, sensor part (include flow strength sensor, pressure sensor and temperature sensor), transition part (variable types based on temper temperatu ature, re, pressu pressure) re),, integr integrati ation on microc microcomp ompute uterr (inclu (include de LCD displa display y and output output part). part). The structure is shown below:

1. Target 2. Sensor Part 3. Measurement Tube 4. Transition Part 5. Integration Microcomputer

2) Principle When flow medium flows through measure tube, a pressure will force on the target because of the flow kinetic energy. It is known that the pressure value forcing on the target can be expressed as

F=CDAPU2/2 where, F — Pressure on the target CD — Damp index A — Area of target on axial projection to measure tube P — Medium density U — Mean velocity of medium









3

Inde Index x and and Disp Displa lay y

1) Main indexes Medium

Liquid, Gas ，Steam and LPG

Caliber

Pipe type 15~300mm

Clamp type 15~600mm

Plug type100~2000mm

Pressure

0.6~10MPa

0.6~42MPa

0.6~42MPa

Medium Temperature -196℃~+450℃ ( Confirming the temperature range before purchase)

Precision

±0.2%

±0.5%

±1.0%

±1.5%

±2.5%

Range

1：3

1：5

1：10

1：10

1：10（Steam）

Compen Compensat sation ion

Temper emperatu ature re compen compensat sation ion;; Press Pressure ure

Repe Repeat atab abil ilit ity y

0.1% 0.1%~0 ~0.0 .08% 8%

Power Power Supply Supply

3.6V 3.6V lithiu lithium m batter battery y, 24V DC

Outp Output ut Material of measure tube

Explosion- Prevent Symbol

Prot Protec ecti tion on Rank Rank

compen compensat sation ion

LCD LCD disp displa lay y, and and 4~20 4~20mA mA,, 0~10 0~10V, V, impu impuls lsee or RS48 RS485 5 (Opt (Optio iona nal) l) Carbon Steel；304；316L; Being able to provide other according to user requests ExiallCT4, ExiallBT4 IP65 IP65；IP67

2) LCD display a. Run in Normal

Temperature

Accumulative flux

Pressure

Instantaneous flux

(Temperature or pressure been not displayed respectively if no setup temperature compensation or pressure compensation.) b. Run in Debug

LCD displays the following contents in debug process: 

Adjustable Coefficient









Serial No. ：n×× 20mA or 10V outputs corresponding to the maximum flow: H××××× Zero-temperature Zero-temperature compensation coefficient ：LT××× 

Nonadjustable Coefficient： Zero- coefficient of flow sensor ：EL××××× Zero- coefficient of pressure sensor ：EP×××××

4

Type Type and and Cate Catego gory ry Digital Display Target Mode Flow meter has several types and categories as follow:

1) Type 

Pipe Pipe Type: ype:

550 Prick Screw Type, spec: DN15~DN50 Whole Flange Type, spec: DN15~DN300



Clamp Type, Type, spec: spec: DN15~DN600



Plug Type, Type, spec: DN150~DN1500

2) Category 

Liquid: high and and normal temperature



Gas: high temperature steam and normal gas gas (The (The deta detail ilss are are incl includ uded ed in “Guid Guidee to Sele Select ct

Digi Digita tall Disp Displa lay y Target rget Mode Mode Flow Flow

meter ”.)

5

Insta Install llat atio ion n and Ou Outp tput ut

1) Flow meter installation Before installing flow meter, user should check the packing list offered by manufacturer, and do preliminary inspection to confirm whether products were damaged by transport or other reasons. 

All All flan flange gess of the the

Flow Flow mete meters rs base base on GB/T GB/T (chi (china na)) stan standa dard rd.. Othe Otherr type type flan flange gess can can

be offered according to other industry standard also. 

In order order to ensure ensure measure measure accurac accuracy y, it is gener generall ally y reques requested ted to set length length of forward forward and backward pipeline as figure 2. And in order to ensure maintenance flow meter online, it should









1, 2 and 3 are respectively the front, behind and by-pass valves and 4 is the flow meter. meter. L≥10D and L>=5D are respectiv respectively ely front and behind behind pipelines pipelines whose lengths lengths are larger than 10 and 5 times of the pipe diameter respectively. 

When installation in vertical position, position, medium flow direction direction is should from down to up.



Do not allow installing installing valve or bend part between front front and behind valves valves that may change change fluid state and infect measure accuracy.



Impacting Impacting on the flow meter during installation installation should be avoid that would damage damage the flow meters or bring zero offset.



Flow Flow meter meter should should be coaxia coaxiall with with front front-be -behin hind d pipeli pipeline, ne, and this can reduce reduce measur measuree error error produced by change of flow state.



Arrow direction direction on measure tube should be consistent with flow flow direction.



When When the flow meter meter is installe installed d in the open-a open-air, ir, it should should be taken taken certai certain n to avoid directl directly y washing by rain.



2

If 4~20mA, 0~10V, 0~10V, impulse or RS485 RS485 outputs are set, 24VDC power is needed to be supplied.

Output installation Flow meter not only displays instantaneous flow and accumulative flow online, but also sends

them them remote remotely ly using using 4~20mA 4~20mA,, 0~10V, 0~10V, impuls impulsee or RS485 RS485 output output modes modes.. There There are are ten output output connection clips are in flow meter back which are respectively signed “1”, “2”, , , , “9” and “GND” as shown shown in the figure figure below below.. In the figure figure,, the sensor sensor (flow (flow streng strength th sensor sensor,, pressu pressure re sensor sensor and temperature sensor) connection clips are shown also.

电源信号接线柱

123456789

1 23 4 5 6 78 9 10

传感器接线柱

Output connection clips Sensor connection clips











r o s n e s h t g n e r t s w o l F

1 2 3 4 5 6 7 8 9 10 温白度 White 蓝传 Blue 感器

Red 红流

量绿 Green 传

黄

Yellow 感

黑

器 Black

红绿 n黄 w黑 k d e l o c e e a l r传感 l 压力 e器 R G Y B

r o s n e s e r u t a r e p m e T

Pressure sensor

According to the different remote output modes, wiring diagrams are different as shown below: a. Pulse output:

1 2 3 4 5 6 7 8 9 24V 24V电源+

DC

24V电源:脉冲共地V脉冲信号输出 Impulse

out

b. 4~20mA current output:

1 2 3 4 5 6 7 8 9 24V电源+ 24V DC 4～20mA电流信号输出

I out out ut

c. 0~10V voltage output:









1 2 3 4 5 6 7 8 9 24V电源+ 24V DC 24V电源-

V-

485输出A

485 A

485输出B

485 B

(Connection of RS485 output mode may be changed according to additional diagram.)

Output function a. Current output range is 4~20mA and voltage output range is 0~10V, both of which express linearly

the instantaneous flow 0~Qmax (zero to maximum). The output characteristics are shown as follow:

4~20 4~20m mA cur current rent outp output ut func unction tion

0~10 0~10V V volta oltage ge outp output ut funct unctio ion n

In the above two figures, the both of I min and Vmin express minimum instantaneous flow. The output values are determined respectively as.

I =(20-4)*Q/Qmax+4 V=10*Q/Qmax

(mA) (V)

b. Impulse output frequency range is 0 ～ 2000Hz. The number of the output impulses expresses the

current flow. User can choose one of two impulse output modes as shown below









inevitable slight impact in transport. If the flow meter do not display zero when flow velocity is zero, zero offset occurs and zero set operation has to be done: 

Close the behind valve; valve;



Turn on the front valve slowly, slowly, make the tube fill measured medium;



Turn on the flow meter and run for about 5 minutes under max max instantaneous flow condition;



Close the front and behind valves and make sure that the flow velocity velocity is zero;



Do zero set operation operation according to the following following set instruction;



For the high temperature temperature flow meter meter without without temperatu temperature re compensation, compensation, zero set operation is necessary while running for each period of time.



For the high temperature temperature flow meter with temperat temperature ure compensation compensation,, zero set operation operation has to been done in normal but high temperature condition.



For the flow meter meter with pressure pressure compensati compensation, on, the pressure zero is also need to be set according according to the following set instruction.

6

Coef Coeffi fici cien entt Se Sett

1) Key-stoke Digital Display Target Mode Flow meter has four key-stokes signed respectively K 1、 K 2、K 3 and K 4, by which coefficients are set. The key-stoke location is shown as follows,

LCD









P1 ××××

(Password)

Enter the password and press K 1 again, then it will go to next display. That wrong password entry will return to normal run state. Pressing K 1 repeatedly will display different contents in turn as shown below: (flow Coefficient)

cL ××××× ct ××××

(Temperature Coefficient)

cP ×××××

(Pressure Coefficient)

(The above three coefficients cannot be changed by user.) n

××

Rank No. First × means: “0” flow unit m 3 “1”flow unit t “2 ” flow unit L “3”flow unit Kg

and second × means the decimal position of instantaneous flow: “0 ” Instantaneous flow ×.×××× “1”Instantaneous flow ××.××× “2 ” Instantaneous flow ×××.×× “3 ” Instantaneous flow ×.×××.× “4 ” Instantaneous flow ×. ××××

cU

×××××

(Small flow flow cut. This coefficient coefficient can can not be changed changed by user. That That instantaneous instantaneous

flow below cU will be zeroed.)

Ud

×

(Remote output mode. The number means:









H=7370 or H=737 means respectively that each impulse expresses 1L flow or that each impulse expresses 0.1L flow.)

Lt LU

××.× ×

P2 ××××

(Zero-temperature (Zero-temperature compensation coefficient) (Flow damp time. Unit: second) (Change the password)

K 2:

K 2 is used to clear the original errors produced by flow strength sensor and pressure sensor, and to set the accumulative zero together with K 4. K 3:

K 3 is used to shift two operation states of setting flow zero point and pressure zero point. K 4:

K 4 is used to revise all of the coefficients: that press it fleetly will change the number from 0 to 9, and that press it for 2 seconds will change the position of number revised.

2) Set operation a. Zero set 

Firstly, Firstly, press K 3 and display the flow zero point EL×××××, then press K 2. When display value changes, press K 3 again to clear flow zero point error.



Presses Presses K 3 and display the pressure zero point EP×××××, then press K 2. When display value changes, pressK 3 again to clear pressure zero point error. Notice: When clearing pressure zero point error, tube pressure must be zero.



For flow meter without pressure pressure compensati compensation, on, it doesn’t doesn’t need to do pressure pressure zero set. After finishing flow zero set, press K 3 twice to exit.













H is set the max instantane instantaneous ous flow value value expressed expressed by 20mA current current or 10V voltage outputs, outputs, that is H=Qmax.



If 1L or 0.1L impulse output mode is chosen, H should should set 7373 or 737. The zero temperature compensation coefficient is set as LT= △E/△t, where △E is variation of zero point with △t temperature changes.

3) Error clearance

Long time in service may render render the flow meter vulnerable vulnerable to errors. errors. Reset Operation Operation is needed needed to get the flow meter back to normal operation as follows: a. Record Record the true flow measured by other Standard Standard Flow Measureme Measurement nt Equipment Equipment and the flow

meter display (instantaneous or accumulative). b. Compute the new flow coefficient according to the below formula:

Cn=Co·Qs/Qc Cn---New flow coefficient Co---Original flow coefficient Qs---True flow value Qc---LCD display value









7

Test Although the flow meter has been strictly tested before leaving factory, because of changes in

environment, installation, running condition, etc, errors will occur and test operation needs to be done using the following methods: 1) Test using standard flow measure equipment

Refer to “Error clear” in Chapter 6. 2) Conversion between two flow media

The primary test medium in factory is water or air. When new non-water or non-air medium is used to test the flow meter, the test result is computed as follows: a. Flow:

Q=Qo where, Q — Flow meter display. （Kg） Qo — True flow.（Kg） p1 — New medium density. （Kg/m3） p — Primary medium density.（Kg/m3）

p1 /p









Remarks: It should be a little error between two different media test results because of different medium characteristics, equipment conditions, installations and other reasons. These errors can be cleared by the method referred to in Chapter 6. 3) Test using hang weight

Hang weight method can be used to test the flow meter as shown in the below figure.

Flow meter

Hang weights

The test result is computed as:

Qm



Qv

where,

 D( 



 D( 

1





1



 )



F  



 )



F











2 100 1000 ( ) 12.52 100 0.7286 











1 750

16( Kg )

It is known that the force on the target is 16Kg while maximum instantaneous flow occurs. So, if using hang weight method, the total quality of hung weights must less than 16Kg. Supposed 3Kg weighs is used, the test result is: Qm



1  D (  ) 



12.52  100(





F  



1 0.7





43269.8( Kg / h)



43.27(t / h)

0.7)  3  750

Remarks: Hang weight method is not able to replace strict experiment test, because of many factors such as medium flow pattern, viscosity, press loss are ignored and errors will occur in hang weight test process.

8

Troub rouble le Shoot Shootin ing g

1) The flow flow meter meter displa display y non-z non-zero ero,, while while the flow flow veloci velocity ty is zero. zero. The followin following g reason reasonss and











Much dirt accretes on the target. target. Solution: clean the target.



Sensor Sensor is wetting then the insulation insulation resistance resistance is decreased. decreased. Solution: Solution: drying sensor sensor by drier or return the flow meter to the factory.

3) Measurement error big. The following reasons and solution methods may be included: 

Flow meter is installed on non-coaxial non-coaxial position correspond corresponding ing to connecting connecting pipeline. pipeline. Solution: Solution: adjust the installation position.



The front or behind connecting connecting pipe is so short. Solution: re-installation re-installation or re-test. re-test.



By-pass pipe is of leakage. leakage. Solution: Solution: check or replace replace it.



Some silk or belt-type eye eye winker accretes accretes on the target. Solution: Solution: clean the target. target.



Integration microcomputer microcomputer circuit board runs wrong. wrong. Solution: Return the flow meter meter to factory.

4) LCD displays nothing or invariable numbers. The following reasons and solution methods may be

included: 

Battery Battery or 24V DC power is connected connected wrong or bad. Solution: Solution: check check and re-connect re-connect all of the connecting wires and clips.



Circuit board or LCD is damaged. damaged. Solution: return the flow meter meter to factory. factory.

5) LCD displays zero always. The following reasons and solution methods may be included:













Flow meter stores automatically automatically all of the measure values values and set coefficients coefficients in its inner FLASH memory.



If environmental environmental temperature is below -20 ℃, LCD will be frozen and display nothing. But it will return to normal work at once when the temperature returns up -18 ℃.

Target Flowmeter Catalog.Z100TF Dalian Zero Instrument Technology Co., Ltd China

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