Klinger Ps116 User manual

Side 1

Ultrasonic Flowmeter

Operation Manual

Ultrasonic Flowmeter

Type PS116

Operation Manual

Side 2

Ultrasonic Flowmeter

Operation Manual

Notice

Thank you for choosing the Ultrasonic Flowmeter and Analyzer with ARM chip and low-voltage wide-pulse

sending technology.

This instruction manual contains important information. Please read it carefully before operation the flowmeter

thus avoiding damage to the flowmeter from improper use.

This instruction manual will advise how to use the flowmeter step-by-step manner, including product component

description, installation, wiring and quick setup etc. to make it easier to operate.

A working knowledge of the menu settings will assist you in understanding the flowmeters’ powerful and output

function.

Warning

May cause injury.

Attention

May damage the flow meter.

Some of the instructions may be different from the flowmeter and analyzer you have purchased. That depends on

the configuration requirements. It also may be due to changes in product design, modification and upgrade .You

will find the flowmeter display interface intuitive and easy to understand and it shall prevail when there is no

indication of the instructions. Please refer to the version number and the appendix for more information.

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Ultrasonic Flowmeter

Operation Manual

Product Components

Inspection should be made before installing the flowmeter. Check to see if the spare parts are in accordance with

the packing list. Make sure that there is no damage to the enclosure due to loose screw or wires or other damage

that may have occurred during transportation. Any questions, please contact your representative as soon as

possible.

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Ultrasonic Flowmeter

Operation Manual

Content

1.Transmitter Installation and Connection ....................................................................................................................6

1.1 WIRE CONNECTING ................................................................................................................................................... 6

1.1.1Power Supply Option.......................................................................................................................................... 6

1.1.2 Transmitter Wiring.............................................................................................................................................6

1.2 POWERING ON........................................................................................................................................................... 6

1.3 KEYPAD FUNCTIONS ..................................................................................................................................................7

1.4 KEYPAD OPERATION .................................................................................................................................................. 7

1.5 FLOWMETER MENU DESCRIPTIONS ...........................................................................................................................8

2. The Quick Setup Instructions ...................................................................................................................................... 9

2.1DOUBLE FUNCTION KEYS MENU DESCRIPTION ............................................................................................................9

2.2 FOR EXAMPLE .......................................................................................................................................................... 13

2.3 MEASUREMENT SITE SELECTION ............................................................................................................................. 15

3.Transducer Installation ............................................................................................................................................... 16

3.1 INSTALLING THE TRANSDUCER ................................................................................................................................16

3.1.1 Transducer Mounting Methods........................................................................................................................ 17

3.1.2 V Method ......................................................................................................................................................... 17

3.1.3 Z Method ......................................................................................................................................................... 17

3.1.4 N Method (not commonly used)......................................................................................................................17

3.2TRANSDUCER INSTALLATION AND FIXING ................................................................................................................ 18

3.3 TRANSDUCER MOUNTING INSPECTION .................................................................................................................... 18

3.3.1 Signal Strength ................................................................................................................................................ 18

3.3.2 Signal Quality (Q value).................................................................................................................................. 18

3.3.3Total Time and Delta Time ............................................................................................................................... 18

3.3.4 Transit Time Ratio ........................................................................................................................................... 19

3.3.5Warnings........................................................................................................................................................... 19

4. Operating Instructions ............................................................................................................................................... 19

4.1 SYSTEM NORMAL IDENTIFICATION .......................................................................................................................... 19

4.2 LOW FLOW CUTOFF VALUE ..................................................................................................................................... 19

4.3 ZERO SETTINGS ....................................................................................................................................................... 19

4.4 SCALE FACTOR ........................................................................................................................................................ 20

4.5 4 ~ 20MA CURRENT LOOP OUTPUT.......................................................................................................................... 20

4.6 4-20MAANALOG OUTPUT CALIBRATION................................................................................................................. 20

4.7TF CARD OPERATION ............................................................................................................................................... 21

4.7.1Specifications ................................................................................................................................................... 21

4.7.2 Install or Remove the SD card while the meter is powered on........................................................................ 21

4.7.3 Reading the TF Data Offline ........................................................................................................................... 21

4.7.4 SD Card Storage Operation ............................................................................................................................. 22

4.8 ESN......................................................................................................................................................................... 23

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Ultrasonic Flowmeter

Operation Manual

5. Window Display Explanations ................................................................................................................................... 24

5.1 WINDOW DISPLAY CODES........................................................................................................................................ 24

5.2 DISPLAY EXPLANATION ........................................................................................................................................... 25

6. Error Diagnoses .......................................................................................................................................................... 43

6.1 TABLE 1. SELF-DIAGNOSIS AND ERROR SOLUTIONS................................................................................................. 43

6.2 FREQUENTLY ASKED QUESTIONS AND ANSWERS.....................................................................................................43

7. Product Overview ....................................................................................................................................................... 45

7.1 INTRODUCTION ........................................................................................................................................................ 45

7.2 FEATURES ................................................................................................................................................................ 45

7.3 THEORY OF OPERATION ........................................................................................................................................... 45

7.4 APPLICATIONS..........................................................................................................................................................46

7.5 SPECIFICATIONS ....................................................................................................................................................... 47

8. Appendix1 - Flow Application Data ..........................................................................................................................48

8.1 SOUND VELOCITY AND VISCOSITY FOR FLUIDS COMMONLY USED.......................................................................... 48

8.2 SOUND VELOCITY FOR VARIOUS MATERIALS COMMONLY USE ...............................................................................48

8.3 SOUND VELOCITY INWATER (1 ATM) ATDIFFERENT TEMPERATURES...................................................................... 49

Update information:

__________________________________________________________________________________________

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Ultrasonic Flowmeter

Operation Manual

1.Transmitter Installation and Connection

1.1 Wire Connecting

1.1.1Power Supply Option

The factory offers one rechargeable 11.1V Lithium battery and matching battery charger.

1.1.2 Transmitter Wiring

Open the hinged top cover of the electronics. Shown from left to right on the panel of the are the downstream

transducer connector, upstream transducer connector, the battery recharge port (charge the transmitter or connect

to a standby power supply), and the 4~20mA output connector.

Refer to the below diagram for specific connection information:

Warning

Wire when it is power-off. Reliable grounding must be taken for the instrument before installation

and use

1.2 Powering On

As soon as the flowmeter is switched on, the self-diagnosis program will start to run. If any error is detected, an

error code will displayed on the screen (see Error Diagnostics). After that, the system will run automatically using

the programmed parameters.

If it is the first time to use or install on a new site, the customer need to input the new installation site parameters.

Any parameters which are set by the user will be saved permanently until they are changed by the user.

When the user modifies the parameters or removes the transducers, the meter will recalculate automatically, and

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Ultrasonic Flowmeter

Operation Manual

operate normally with the newly set parameters.

1.3 Keypad Functions

Follow these guidelines when using the flowmeter keypad:

~ and to input numbers.

Backspace or delete characters to the left.

and Return to the last menu or open the next menu. Acts

as “+” and “-” are used to enter numbers.

Select a menu. Press this key first, input a two-digit menu number

and the selected menu data will be displayed. For example, to input a pipe

outside diameter, press where “11” is the

window ID to display the pipe outside diameter. Enter/Confirm

Enter/Exit SD card storage interface. 、、、

、、.Are shortcuts to the windows for Flow Rate, POS

Totalizer, Velocity, Fluid Type, Signal Quality and Diagnosis.

1.4 Keypad Operation

The instrument setup and measurement displays are subdivided into more than 100 independent menus. The

operator can input parameters, modify settings or display measurement results by “visiting” a specific menu.

These menus are arranged by 2-digit serial numbers from 00~99, then using +0, +1, etc. Each menu ID code has a

defined meaning. For example, menu 11 is the pipe outside diameter, while menu 25 is the mounting spacing

between the transducers. Each menu is discussed later in this manual.

To visit a specific menu, press the key at any time except the SD Card Storage Interface, then input the

2-digit menu ID code and that menu will be displayed. For example, to input or check the pipe outside diameter,

press the keys for window ID code 11.

Another method to visit a particular menu is to press the and keys to scroll through the

menus. For example, if the current menu is 30, press key to enter menu 31, press the button

again to enter menu 30.

The menus are divided into three types:

1) Data Type, such as M11, M12;

2) Selection Type, such as M14;

3) Display Type, such as M00, M01.

Visit Data Type menus to check specific parameters. If

parameter change is needed, just input the values then

press ; or press first, then input the

values and press to confirm.

Example 1: To enter a pipe outer diameter of 200mm,

the procedure is as follows:

Press to enter Menu11 (the

numerical value displayed currently is the previous

Side 8

Ultrasonic Flowmeter

Operation Manual

Men u

Pi pe Out er Di amet er

168. 00 mm

3 0 Q=97 R

pipe outer diameter). Now press the key. The

symbol “>” and a flashing cursor is displayed on the

left side of the third line on the screen. The new value

can now be entered. Or input the value first then press

to confirm .

Visit Selection Type menus to check the related

options. If need to modify it, press enter first to enter

the revised selection when the symbol “>” and a

flashing cursor are displayed at the left end of the

third line on the screen; or input numbers directly to

select the option when the symbol “>” and a flashing

cursor are displayed.

Example 2: If the pipe material is “Stainless Steel”,

press to enter Menu 14, then

press to modify the option. Then, select “1.

Stainless Steel” from the drop-down menu (you may

cycle through the choices by pressing the and

keys) and then press to confirm the

selection. It is also possible to press the key

to change the selection and wait until “1. Stainless

Steel” is displayed on the second line of the screen.

Men u

Pi pe Mat er i al [ 14

1. St ai nl es s St eel

45 Q=97 R

Then press the key to confirm.

1.5 Flowmeter Menu Descriptions

00~09 Display menus: Used to display flow rate, positive total, negative total, net total, velocity, date

& time etc.

10~29 Setup menus: Used to enter pipe outer diameter, pipe wall thickness, fluid type, transducer

type, transducer mounting and spacing, etc.

30~38 Flow units selection and totalizer operating menus: Used to select units of measurement. Other menus

set/reset the various totalizer modes.

40~45 Zero Set Calibration, Scale Factor.

55~83 Input and output setup menus: current loop mode select, 4mA or 0mA output value, etc.

90~94 Diagnostics: signal strength quality (menu 90), TOM/TOS*100 (menu 91), sound velocity

(menu 92), total time and delta time of the measured signal (menu 93), Reynolds number and K

factor (menu 94).

+0~+4 Appendix: Power on/off time, total working hours, on/off times etc.

-0 4~20mA correction menu.

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Ultrasonic Flowmeter

Operation Manual

Attention

“Hidden” menus are for hardware adjustment (set by the manufacturer).

2. The Quick Setup Instructions

2.1Double function keys menu description

Press

Press the display Flow Rate of M02.

Men u

FLOW 0

0 00 0m3/ h

POS 744x 1 m3

42 Q=97 R

Press

Press the display Velocity of M01.

Men u

FLOW 0

0000 m3/ h

Vel 0

0 00 0 m/ s

02 Q=97 R

Press

Press the display Signal Strength of M90.

Men u

St r engt h+Qual i t y [ 90

5 DN

0 Q=97

25 Q=97 R

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Ultrasonic Flowmeter

Operation Manual

Press

Press the Total of M00.

Men u

FLOW 0

0000 m3/ h

NET 744x 1 m3

42 Q=97 R

Press

Press the TOM/TOS of M91.

Men u

Tom/ Tos * 100 [ 91

00%

45 Q=97 R

Press

Press the display System of M08.

* R- - - - - - - - - - - - - - - - -

I ns t r ument Wor k i ng

Pr ope r l y

24 Q=97 R

Press

Enter input Pipe Outer Diameter of M11.

Men u

Pi p e Out er Di amet er

168. 00 mm

3 0 Q=97 R

Press

Enter input Pipe Wall Thickness of M12.

Pi pe Wal l Thi c k nes s

0 0 mm

00 Q=97 R

Side 11

Ultrasonic Flowmeter

Operation Manual

Press

Enter the select Pipe Material type of M14.

Men u

Pi pe Mat e r i a l [ 1 4

0. Car bon St e el

45 Q=97 R

Press

Enter the select Fluid Type of M20.

Fl ui d Ty pe [ 2 0

Wat e r

58 Q=97 R

Press

Enter the select Transducer Mounting of M24.

Tr an s d u c er Mount i ng

20 Q=97 R

Press

Start/stop manual totalizer in turn.

202 s ec

OFF 2. 125 m3

30 Q=00 R

Side 12

Ultrasonic Flowmeter

Operation Manual

Press

Show/keep totalizer in turn.

FLOW 1 0

2 5 4 6 m3/ h

POS 230x 1 m3

30 Q=00 R

Press

Display dynamic/normal mode instantaneous flow

and flow velocity in turn.

Men u

FLOW 10

2546m3 / h Dy n

Vel 1

0250 m/ s

30 Q=00 R

Press

Enter the Fluid Sound Velocity of M92.

Men u

Fl ui d Sou n d Vel oc i t y

0 m/ s

56 Q=97 R

Press

Enter setup time of M60.

Men u

YY- MM- DD HH

10 - 03- 08 15

00 Q=97 R

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Ultrasonic Flowmeter

Operation Manual

Press

Press enter the manual calibration of flow

velocity, press to manual accumulation,

then press accumulated over, press

input criteria cumulants, confirm reasonable press

store to complete the calibration

coefficient K.

Manual Cal i br at e

Pr es s ENT When Ready

30 Q=97 R

Press

Enter the password to Set zero to remove 1234.

2.2 For example

Example: Let us assume you have a DN150 (6”) pipe, measuring water, Material is carbon steel with no liner.

These parameters should be entered as follows:

Step 1. Pipe outside diameter

Press keys to enter menu 11,

enter the pipe outside diameter, then press the

key.

Pi pe Out er Di a met er

168. 00 mm

30 Q=97 R

Step 2. Pipe wall thickness

Press the key to enter menu

12, enter the pipe wall thickness (wall thickness for

various pipe schedules can be found in the appendix),

then press the key.

Men u

Pi pe Wal l Thi c k nes s

0 0 mm

00 Q=97 R

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Ultrasonic Flowmeter

Operation Manual

Step 3. Pipe material

Press the key to enter menu 14,

press the key, use the or

key to select the pipe material from the drop-down

menu, then press the key.

Men u

Pi pe Mat e r i a l [ 1 4

0. Car bon St e el

45 Q=9 7 R

Step 4. Liner material parameters

(including thickness and sound velocity, if needed)

Press the key to enter menu

16, press the key, use the or

key to select liner material from the drop-down menu,

and then press the key.

Me n u

1 6

L i n e r Ma t e r i a l [ 1 6

0. No n e , Li ner

10 Q=97 R

Step 5. Fluid type

Press the key to enter menu

20, press the key, use the or

key to select fluid type from the drop-down menu,

then press the key.

Fl ui d Ty pe [ 2 0

Wat er

58 Q=9 7 R

Step 6. Transducer mounting methods

Press the key to enter menu

24, press the key, use the or

key to select transducer-mounting from the drop-down

menu, then press the key.

(Details on Chapter 4.1)

Men u:2 4

Tr a n s du c e r Mount i ng

0.V

14:56:20 Q=97 R

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Ultrasonic Flowmeter

Operation Manual

Step 7. Transducer spacing

Press the key to enter menu

25, accurately install the transducer according to the

displayed transducer mounting spacing and the

selected mounting method.

(Details on Chapter 4).

Tr a n s du c er Spa c i ng

131

8 2 mm

40 Q=97 R

Step 8. Display Measurement Results

Press to enter Menu 01 to

display flow rate. (Subject to the real measurement.)

FL OW 0

0000 m3 / h

Vel 0

00 00 m/ s

4 3

02 Q=97 R

2.3 Measurement Site Selection

Comparing with other kinds of flowmeters, Ultrasonic Flowmeter is the simplest one to install. Choose a proper

measurement site, enter the pipe’s parameters into the flowmeter, install and fix the transducers on the pipe, then it

can start the measurement.

When selecting a measurement site, it is important to select an area where the fluid flow profile is fully developed

to guarantee a highly accurate measurement. Use the following guidelines to select a proper installation site:

l Choose a section of pipe that is always full of liquid, such as a vertical pipe with flow in the upward direction

or a full horizontal pipe.

l Ensure enough straight pipe length at least equal to the figure shown below for the upstream and downstream

transducers installation.

l On the horizontal pipe, the transducer should be mounted on the 3 o’clock and 9 o’clock position of the pipe

section, avoid the 6 o’clock and 12 o’clock position, in order to avoid the signal attenuation caused by the

sediment at the bottom, or air bubbles or cavitation.

l Ensure that the pipe surface temperature at the measuring point is within the transducer temperature limits.

l Consider the inside condition of the pipe carefully. If possible, select a section of pipe where the inside is free

of excessive corrosion or scaling.

l Choose a section of sound conducting pipe.

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Ultrasonic Flowmeter

Operation Manual

3.Transducer Installation

3.1 Installing the Transducer

Before installing the transducers, clean the pipe surface where the transducers are to be mounted. Remove any rust,

scale or loose paint and make a smooth surface. Choose a section of sound conducting pipe for installing the

transducers. Apply a wide band of sonic coupling compound down the center of the face of each transducer as

well as on the pipe surface, ensure there are no air bubbles between the transducers and the pipe wall, and then

attach the transducers to the pipe with the straps provided and tighten them securely.

Note:

1. The two transducers should be mounted at the pipe’s centerline on horizontal pipes. Make sure that the

transducer mounting direction is parallel with the flow.

2. During the installation, there should be no air bubbles or particles between the transducer and the pipe wall. On

horizontal pipes, the transducers should be mounted in the 3 o’clock and 9 o’clock positions of the pipe section in

order to avoid any air bubbles inside the top portion of the pipe.

3. Refer to 2.15 for the Transducer Mounting Spacing.

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Ultrasonic Flowmeter

Operation Manual

4. If the transducers cannot be mounted horizontally symmetrically due to limitation of the local installation

conditions, it may be necessary to mount the transducers at a location where there is a guaranteed full pipe

condition (the pipe is always full of liquid).

3.1.1 Transducer Mounting Methods

Three transducer mounting methods are available. They are respectively: V method, Z method and N method.

The V method is primarily used on small diameter pipes (DN100~300mm, 4"~12"). The Z method is used in

applications where the V method cannot work due to poor signal or no signal detected. In addition, the Z method

generally works better on larger diameter pipes (over DN300mm, 12") or cast iron pipes.

The N method is an uncommonly used method. It is used on smaller diameter pipes (below DN50mm, 2").

3.1.2 V Method

The V method is considered as the standard method. It usually gives a more accurate reading and is used on pipe

diameters ranging from 25mm to 400mm (1" ~ 16") approximately. Also, it is convenient to use, but still requires

proper installation of the transducers, contact on the pipe at the pipe’s centerline and equal spacing on either side

of the centerline.

3.1.3 Z Method

The signal transmitted in a Z method installation has less attenuation than a signal transmitted with the V method

when the pipes are too large, there are some suspended solid in the fluid, or the scaling and liner are too thick .

This is because the Z method utilizes a directly transmitted (rather than reflected) signal which transverses the

liquid only once. The Z method is able to measure on pipe diameters ranging from 100mm to 5000mm (4" to 200")

approximately. Therefore, we recommend the Z method for pipe diameters over 300mm (12" ).

3.1.4 N Method (not commonly used)

With the N method, the sound waves traverse the fluid three times and bounce twice off the pipe walls. It is

suitable for small pipe diameter measurement. The measurement accuracy can be improved by extending the

transit distance with the N method ( uncommonly used ).

Downstream Transducer

Upstream Transducer

Flow

Transducer Space

Flow

Side View Section Top View

Pipe Strap

Transducer

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Ultrasonic Flowmeter

Operation Manual

3.2Transducer Installation and Fixing

Transducers can stick onto the pipe with its magnetic steel racks. If need to fasten them, then can use the chains to

make it firm. See below picture.

3.3 Transducer Mounting Inspection

Check to see if the transducer is installed properly and if there is an accurate and strong enough ultrasonic signal

to ensure proper operation and high reliability of the transducer. It can be confirmed by checking the detected

signal strength, total transit time, delta time as well as transit time ratio.

The "mounting" condition directly influences the flow value accuracy and system long-term operation reliability.

In most instances, only apply a wide band of sonic coupling compound lengthwise on the face of the transducer

and stick it to the outside pipe wall to get good measurement results. However, the following inspections still need

to be carried out in order to ensure a high reliability of the measurement and long-term operation of the

instrument.

3.3.1 Signal Strength

Signal strength (displayed in Signal) indicates a detected strength of the signal both from upstream and

downstream directions. The relevant signal strength is indicated by numbers from 00.0 ~ 99.9. 00.0 represents no

signal detected while 99.9 represents maximum signal strength. Normally, the stronger the signal strength detected,

the longer the operation of the instrument reliably, as well as the more stable the measurement value obtained.

Adjust the transducer to the best position and ensure enough sonic coupling compound has been applied

adequately during the installation in order to obtain the maximum signal strength.

System normal operation requires signal strength over 65.0, which is detected from both upstream and

downstream directions. If the signal strength detected is too low, the transducer installation position and the

transducer mounting spacing should be re-adjusted and the pipe should be re-inspected. If necessary, change the

mounting method to be Z method.

3.3.2 Signal Quality (Q value)

Q value is short for Signal Quality (displayed in Signal). It indicates the level of the signal detected. Q value is

indicated by numbers from 00 ~ 99. 00 represents the minimum signal detected while 99 represent the maximum.

Normally, the transducer position should be adjusted repeatedly and coupling compound application should be

checked frequently to ensure the signal quality can be detected as strong as possible.

3.3.3Total Time and Delta Time

"Total Time and Delta Time", which displays in Window M6.04, indicates the condition of the installation. The

measurement calculations in the flowmeter are based upon these two parameters. Therefore, when "Delta Time"

fluctuates widely, the flow and velocities fluctuate accordingly, this means that the signal quality detected is too

poor. It may be the resulted of poor pipe-installation conditions, inadequate transducer installation or incorrect

parameter input.

Generally, "Delta Time" fluctuation should be less than ±20%. Only when the pipe diameter is too small or

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Ultrasonic Flowmeter

Operation Manual

velocity is too low can the fluctuation be wider.

3.3.4 Transit Time Ratio

Transit Time Ratio indicates if the transducer mounting spacing is accurate. The normal transit time ratio should

be 100+/-3 if the installation is proper. Check it in Window M6.02.

Attention

If the transit time ratio is over 100±3, it is necessary to check:

If the parameters (pipe outside diameter, wall thickness, pipe material, liner, etc.) have been

entered correctly,

If the transducer mounting spacing is accordance with the display in Window M25,

If the transducer is mounted at the pipe’s centerline on the same diameter,

If the scale is too thick or the pipe mounting is distorted in shape, etc.

3.3.5Warnings

(1) Pipe parameters entered must be accurate; otherwise the flowmeter will not work properly.

(2) During the installation, apply enough coupling compounds in order to stick the transducers onto the pipe wall.

While checking the signal strength and Q value, move the transducers slowly around the mounting site until the

strongest signal and maximum Q value can be obtained. .

(3) Check to be sure the mounting spacing is accordance with the display in Window M25 and the transducer is

mounted at the pipe’s centerline on the same diameter.

(4) If the signal strength is always displayed as 0.00, that means there is no signal detected. Thus, it is necessary to

check that the parameters (including all the pipe parameters) have been entered accurately. Check to be sure the

transducer mounting method has been selected properly, the pipe is not worn-out, and the liner is not too thick.

Make sure there is indeed fluid in the pipe or the transducer is not too close to a valve or elbow, and there are not

too many air bubbles in the fluid, etc. With the exception of these reasons, if there is still no signal detected, the

measurement site has to be changed.

(5) Keep the flowmeter away from the electromagnetic interference area to ensure its proper operation..

(6) After completing the installation, power on the instrument and check the parameters and the result accordingly.

4. Operating Instructions

4.1 System Normal Identification

Press the keys. If the letter “*R” displays on the screen, it indicates system normal.

If the letter “G” is displayed, it indicates that system is adjusting the signal gain prior to the measurement. Also, it

means system normal. Only when the adjustment takes too long without stopping, can system be identified as

abnormal.

Letter “I” indicates no signal is being detected. Check to see if the transducer wiring connections are correct, the

transducers are securely installed, etc.

For further information, please refer to “Error Diagnosis”.

4.2 Low Flow Cutoff Value

The data in M41 is Low Flow Cutoff Value. If the flow rate falls below the low flow cutoff value, the flow

indication is deemed to be ZERO. This can prevent the flow meter accumulate the flow when the actual flow

is"0"after a pump was shut down. Generally, 0.03m/s is recommended to enter as the low flow cutoff point.

The low flow cutoff value has no relation to the measurement results once the velocity is higher than the low flow

cutoff value.

4.3 Zero Settings

When zero flow occurs, any measuring instrument will has a zero point which shows the measuring value is not

equal to “0”, this value indicates "Zero". To any measuring instrument, the smaller the "Zero" is, the better the

quality is.

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Ultrasonic Flowmeter

Operation Manual

If the zero set point is not at true zero flow, a measurement difference may occur. The smaller the measurement

flow is, the larger the measurement difference caused by the zero point will exist. Only when zero point reduced

to a definite degree the measuring difference caused by the zero point can be ignored.

For an ultrasonic flowmeter, the measurement difference caused by the zero point cannot be ignored under low

flow conditions. It is necessary to perform a static zero set calibration to improve the low flow measurement

accuracy.

Set Zero in Menu42 press , and then wait for the processing indication or displayed Complete..If setting

Zero in flowing conditions, it may cause the flow to be displayed as "0". If so, it can be recovered via Menu 43.

4.4 Scale Factor

Scale factor refers to the ratio between "actual value" and "reading value". For example, when the measurement is

2.00, and it is indicated as 1.98 on the instrument, the scale factor reading is 2/1.98. This means that the best scale

factor constant is 1. However, it is difficult to keep the scale factor as "1" on the instrument especially in batch

productions. The difference is called "consistency".

During operation, there still exists possible difference in pipe parameters, etc. The "scale factor" may be necessary

when used on different pipes. Thus, scale factor calibration is specially designed for calibrating the differences

that result from application on different pipes. The scale factor entered must be one that results from actual flow

calibration. The scale factor can be input in Window M45.

4.5 4 ~ 20mA Current Loop Output

With a current loop output exceeding an accuracy of 0.1%, the flowmeter is programmable and configurable with

outputs such as 4 ~ 20mA selected in Menu 55. Please refer to Menu 55 in "Window Display Explanations" for

more information.

In Window M56, enter a 4mA flow value. Enter the 20mA flow value in Window M57. For example, if the flow

range in a specific pipe is 0 ~ 1000m3/h, enter 0 in Window M56and 1000 in Window M57.

Calibrating and testing the current loop is performed in Window M58. Complete the steps as follows：

Press ,move or to display “0mA”, “4mA”, “8mA”, “16mA”,

“20mA” readings, connect an ammeter to test the current loop output and calculate the difference. Calibrate it if

the difference is not within tolerance. Refer to Section 5.6 for Current Loop Verification.

Check the present current loop output in Window M59, the value will change along with the change of the flow.

4.6 4-20mA Analog Output Calibration

Attention

Each flowmeter has been strictly calibrated before leaving factory. It is unnecessary to

carry out this step except when the current value (detected while calibrating the current loop)

displayed in Window M58 is not identical with the actual output current value.

Calibrate the analog input required to expand the hardware debugging menu as below procedures:

Press , enter the password “115800” then press . This action will be

inoperative after powering off.

Then press to enter the Current Loop Verification Mode, press to enter the 4mA verification

status, use an accurate ammeter to measure the output current of the current loop, and move or

to adjust the displayed values, wait for the ammeter current value to reach “4mA”, then the 4mA verification is

finished.

Press to do the 20mA verification using the same procedure as for the 4mA verification.

The calibration results will be automatically saved in EEPROM and won’t get lost even if power off.

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