STDS100 Handheld Ultrasonic Flow Meter

Select installation point

§ 1.1Working condition requirements

The installation of ultrasonic flow meters is the simplest and most convenient among all flow meters. Simply select a suitable measurement point, input the pipeline parameters at the measurement point into the flow meter, and then fix the sensor on the pipeline.

Choosing the installation point is crucial for accurate measurement, and the following factors must be considered when selecting the installation point: full pipe, steady flow, scaling, temperature, pressure, interference, etc.

1. Full tube: Choose a material filled with fluid that is uniform and dense, 2Steady flow: The installation distance should be greater than 10 times upstream

Pipe sections that are easy to transmit ultrasonic waves, such as vertical pipe sections (with fluid flowing towards the straight pipe diameter and downstream diameter greater than 5)There are no bends within the diameter of the double straight pipe

Upward flow) or horizontal pipe segments. The installation point of a uniform straight pipe section with variable diameter should be located away from the valve

Interference sources such as pumps, high-voltage electricity, and frequency converters.

3. Avoid installing it at the highest point of the pipeline system or at any other locationFor open or partially filled pipelines, flow meters should

Installed on the vertical channel of the outlet (with fluid flowing downwards) in UAt the section of the pipe.

5. The temperature and pressure at the installation point should be within the working range of the sensor.

6. Fully consider the scaling condition on the inner wall of the pipe: even if a pipeline without scaling is selected for installation, if it cannot meet the requirements, scaling can be considered as lining for better measurement accuracy

7. Two sensors must be installed in the horizontal direction of the pipeline axis, and at a horizontal position of ± 45 ° on the axisInstall within the range to prevent phenomena such as incomplete pipes, bubbles, or sedimentation in the upper part, which may affect the normal measurement of the sensor. If the installation location is limited by space and cannot be installed horizontally symmetrically, sensors can be installed vertically or at an angle while ensuring that there are no bubbles in the upper part of the pipe.

Example of probe installation point

§ 1.2Construction requirements for installing sensors in instrument wells

If the on-site sensor needs to be installed in the instrument well, there must be a certain installation space for people to work upright, that is, the distance between the pipe wall and the wall should be at least 550mmAbove, the width W is greater than (D+550 × 2) mm, the cement pipeline W is greater than (D+700 × 2) mm, and the axial width L of the instrument well is greater than D+1200mm. When installing sensors, flanges, welds, and reducers should be avoided, and they should be installed as much as possible within the horizontal position of the pipeline axis ± 45 °, and then the main engine housing should be grounded.

Installation measurement

§ 2.1power supply

Handheld/The portable ultrasonic flowmeter (energy meter) uses a built-in rechargeable nickel hydrogen battery, which can work continuously for about 15-20 hours after being fully charged; Continuous measurement can be achieved using an external charger.

The charging method adopts intelligent charging. The operator can insert one end of the equipped power cord into the charging port and connect the other end to a power socket to complete the charging operation.

§ 2.2power on

Handheld/After the portable ultrasonic flowmeter (energy meter) is powered on, the self diagnostic process is first run. If there is a fault, the corresponding error message is displayed (see the fault finding section). After diagnosis, the machine will operate according to the parameters entered by the user last time.

If it is the first time using or installing at a new installation point, you need to input the parameters of the new installation point. Any parameters entered by the user are recorded in RAMInternally, it will be lost in case of power failure. If permanent storage is required, please enter menu 26 and select 1 curing parameter.

When the user changes the parameters, the machine will automatically recalculate and adjust according to the new parameters entered by the user. Ultrasonic flow meters are capable of completing all tasks simultaneously, regardless of which display window they are on. Measurement, output, and other tasks continue as usual.

The ultrasonic flowmeter automatically enters the display window it was in before the last power outage after each power on.

§ 2.3Quickly complete initial setup

The ultrasonic flowmeter needs to input the following parameters before measurement:

　　1. type inM 1 1 Enter the outer diameter of the tube in window 11 and typeENTKey;

　　2. type in-Enter the thickness of the pipe wall in window 12 and typeENTKey;

　　3. type in-Enter window 14ENT，+Or-After selecting the pipe material, type inENTKey;

　　4. type in-Enter window 16ENT，+Or-After selecting the lining material, type inENTKey;

　　5. type in-Enter window 18ENT，+Or-After entering the thickness of the lining material, type inENTKey;

　　6. type in-Enter window 20ENT，+Or-After selecting the fluid type, type inENTKey;

　　7. type in-Enter window 23ENT，+Or-After selecting the sensor type, type inENTKey; (See installing sensors for details)

　　8. type in-Enter window 24ENT，+Or-After selecting the installation method, type inENTKey;

　　9. type in-Enter window 25ENTInstall the sensor according to the displayed installation distance and the installation method selected in the previous step.

　　10. M 4 0 Damping coefficient. (Default 10 seconds, generally no need to change)

　　11. M 4 1 Low flow rate cutting treatment. (Factory default value of 0.03m/s, generally does not need to be changed)

　　12. M 2 6 Enter window 26,+Or-Select "1 curing parameter" and use it all the time, then type inENTKey (this operation is very important).

　　13.type inM 9 0 Enter window 90 and check the signal strength and quality. The minimum is above 60.0, the larger the better. If it is below 60, normal operation cannot be guaranteed;

　　14. type inM 9 1 Enter window 91 and check the signal transmission time ratio. Generally, it is required to be within 100 ± 3;

　　15. type inM 0 8 Enter window 08, check the machine's working status, and display * R as the signal is normal;

16. type inM 0 1 Enter 01The window displays the measurement results;

§ 2.4Install sensors

Before installation, the dense part of the pipe should be selected for sensor installation. Then, the area outside the pipe where the sensor is to be installed should be cleaned, and rust and paint should be removed. If there is a rust proof layer, it should also be removed. It is best to use an angle grinder to polish it, and then use a clean cloth dipped in acetone or alcohol to wipe off oil and dust. Then, apply enough coupling agent to the pipe wall around the center where the sensor is to be installed. Finally, press the sensor tightly against the pipe wall and follow the instructions of 24The installation method displayed in menu 3.2.1.1 and the installation distance displayed in menu 25 should be bundled together. Be sure not to have air bubbles or gravel between the attached sensor and the pipe wall.

§ 2.4.1Sensor Introduction

§ 2.4.2Sensor wiring

Handheld/portable ultrasonic flowmeter (energy meter) sensors use different colors to distinguish between upstream and downstream sensors, with red connecting to upstream sensors and blue connecting to downstream sensors. Please note.

§ 2.4.3Sensor installation method

The installation method of external clamp sensors includes VLaw and Z method. (See installation diagram for details)

In general, the installation pipe diameter is between DN15-DN200mmWithin the range, the V method can be preferred. When the V method cannot measure the signal or the signal quality is poor, the Z method can be used. When the pipe diameter is above DN200mm or when measuring cast iron pipes, the Z method should be preferred.

Vlaw

Normally, VFa is a relatively standard installation method that is easy to use and accurate in measurement. During installation, the two sensors are aligned horizontally, with their center line being level with the pipeline axis. The measurable pipe diameter range is approximately DN15-DN200mm.

Zlaw

ZLaw is the most commonly used installation method, characterized by direct transmission of ultrasonic waves in pipelines without reflection (known as single acoustic path), and minimal signal attenuation loss.

ZThe measurable diameter range of the method is 100mm-6000mmWhen installing on site, it is recommended to use the Z-method for pipelines with a diameter of 200mm or more (as this will result in the highest measured signal).

matters needing attention:

1. During installation, the pipeline area where the sensor is to be installed must be cleaned thoroughly to expose the original luster of the metal;

2. The shielding wire of the ultrasonic signal cable can be suspended without connection, and should not be short circuited with the positive and negative poles (brown and blue wires);

3. After the sensor is wired, it must be filled with sealant (silicone) to prevent water from entering;

4. After filling the sensor with sealant and covering it, the shielded cable inlet hole of the sensor must be tightened and locked to prevent water from entering;

5. When bundling sensors, the fixture should be attached（The stainless steel strip is fixed at the center of the sensor to ensure uniform force distribution and prevent sliding;

6. The contact area between the sensor and the pipeline should be coated with sufficient coupling agent or silicone to prevent air, dust, or rust from entering and affecting the transmission of ultrasonic signals.

§ 2.5Check installation

Checking installation refers to checking whether the sensor is installed properly and whether it can receive correct, strong enough ultrasonic signals that can make the machine work normally, in order to ensure the long-term reliable operation of the machine. By checking the received signal strength, total transmission time, time difference, and transmission time ratio, it can be determined whether the installation point is optimal.

The quality of installation directly affects whether the flow value is accurate and whether the flowmeter can operate reliably for a long time. Although in most cases, measuring results can be obtained by simply coating the sensor with coupling agent and attaching it to the outside of the pipe wall, the following checks still need to be performed to ensure the best measurement results and ensure the long-term reliable operation of the flowmeter.

§ 2.5.1Signal strength

Signal strength (M90)The middle display refers to the strength of the signals received by the probes in both upstream and downstream directions. The relative signal strength of ultrasonic signals is represented by numbers ranging from 00.0 to 99.9. 00.0 means no signal received; 99.9 represents the maximum signal strength.

During installation, try to adjust the position of the sensor and check if the coupling agent is sufficient to ensure maximum signal strength. The condition for the system to function properly is that the signal strength in both directions is greater than 60When the signal strength is too low, the installation position, spacing, and pipeline of the sensor should be rechecked for suitability or replaced with Z-method installation. In general, the stronger the signal strength and the more stable the measurement value, the more reliable it can operate for a long time.

§ 2.5.2Signal quality (Q)Value)

Signal quality abbreviated as QThe value (displayed in M90) refers to the quality of the received signal. The MHC-3000 series uses numbers from 00 to 99 to represent signal quality. 00 indicates the worst signal, 99 indicates the best signal, and generally requires a signal of 60 or above.

The reasons for poor signal quality may be high interference, poor sensor installation, or the use of poor quality, non specialized signal cables. In general, the sensor should be repeatedly adjusted to check if the coupling agent is sufficient until the signal quality is maximized.

§ 2.5.3Total transmission time and time difference

Window M93The "total transmission time and time difference" displayed in the flow meter can indicate whether the installation is appropriate, because the internal measurement calculation of the flow meter is based on these two parameters. Therefore, when the "time difference" indication fluctuates too much, the displayed flow rate and velocity will also jump sharply. This situation indicates poor signal quality, which may be due to poor pipeline conditions, inappropriate sensor installation, or incorrect parameter input. Under normal circumstances, the fluctuation of time difference should be less than ± 20%. But when the pipe diameter is too small or the flow rate is very low, the fluctuation of time difference may be slightly larger.

§ 2.5.4Transmission time ratio

The transmission time ratio is used to confirm whether the sensor installation spacing is correct. The transmission ratio should be 100 ± 3 when installed correctlyThe transmission time ratio can be viewed in M91.

When the transmission ratio exceeds 100 ± 3When determining the range, it is necessary to check whether the input parameters (pipe outer diameter, wall thickness, pipe material, lining, etc.) are correct, whether the installation distance of the sensor is consistent with the data displayed in M25, whether the sensor is installed on the same axis of the pipeline, whether there is too thick scaling, and whether the pipeline at the installation point is elliptical deformed.

§ 2.5.5Precautions during installation

　　1）The input pipeline parameters must be correct and consistent with the actual situation, otherwise the flowmeter cannot work properly.

　　2）When installing, use enough coupling agent to stick the sensor to the pipeline wall. While checking the signal strength and signal quality values displayed by the host, slowly move the sensor near the installation point until the strongest signal and maximum signal quality value are received. The larger the diameter of the pipeline, the greater the range of sensor movement. Then confirm whether the installation distance matches the sensor installation distance given by M25, and whether the sensor is installed on the same straight line as the pipeline axis. Pay special attention to pipes made of rolled steel plates, as these pipes are irregular. If the signal strength is always marked as 00.0, it indicates that the flowmeter has not received the ultrasonic signal. Check whether the parameters (including all parameters related to the pipeline) are input correctly, whether the installation method of the sensor is selected correctly, whether the pipeline is too old, whether its lining is too thick, whether there is fluid in the pipeline, whether it is too close to the valve elbow, and whether there are too many bubbles in the fluid. If it is not for these reasons, the signal cannot be received, so we have to try another measurement point or choose a plug-in sensor.

　　3）Confirm whether the flowmeter is working properly and reliably: the higher the signal strength and signal quality Q value, the higher the credibility of the displayed flow value, and the more reliable the flowmeter can work for a long time. If the environmental electromagnetic interference is too large or the received signal is too low, the reliability of the displayed flow value will be poor, and the possibility of long-term reliable operation will be small.

4）At the end of installation, the instrument should be powered on again and the results checked for accuracy.

§ 2.6Introduction to Handheld Function Wiring