How to install and use IFM electromagnetic flowmeter?

Ifm electromagnetic flowmeter is simply composed of a flow sensor transmitter. The installation requirement of the electromagnetic flowmeter is that it must be installed at the low point of the pipeline or the vertical section of the pipeline, but it must be when the pipe is full. The requirement for the straight pipe section is 5D in front and 3D in the back, so as to ensure the efficiency of the electromagnetic flowmeter. usage and accuracy requirements.

The measurement principle of IFM electromagnetic flowmeter does not depend on the flow characteristics. If there is a certain amount of turbulence and vortex in the pipeline that is generated in the non-measurement area (such as: elbow, tangential flow restriction or A half-open shut-off valve upstream) is irrelevant to the measurement. If there is a steady eddy current in the measurement area, it will affect the stability and accuracy of the measurement. At this time, some measures should be taken to stabilize the flow velocity distribution:

1. Increase the length of the front and rear straight pipe sections

2. Use a flow stabilizer

3. Reduce the cross-section of the measuring point.

1． Requirements for the external environment

1.1. The flowmeter should avoid being installed in places where the temperature changes greatly or is subject to high-temperature radiation from the equipment. If it must be installed, heat insulation and ventilation measures must be taken.

1.2. The flow meter is installed indoors. If it must be installed outdoors, it should be protected from rainwater, flooding and sun exposure. Moisture-proof and sun-proof measures must be taken.

1.3. The flowmeter should be avoided from being installed in an environment containing corrosive gases. When it must be installed, ventilation measures must be taken.

1.4. In order to facilitate installation, maintenance and upkeep, there must be ample installation space around the flow meter.

1.5. The installation site of the flow meter should avoid magnetic fields and strong vibration sources. If the pipe vibration is large, there should be supports to fix the pipe on both sides of the flow meter.

1. 2. Pipeline electromagnetic flowmeter

2.1. Requirements for straight sections

In order to improve the influence of eddy currents and flow field distortion, the length of the straight pipe sections before and after the flowmeter is installed has certain requirements, otherwise the measurement accuracy will be affected (a rectifier can also be installed, try to avoid Install close to the regulating valve and half-open valve).

2.2. Requirements for process pipes

IFM electromagnetic flowmeters have certain requirements for the upstream and downstream process pipes of the installation point, otherwise the measurement accuracy will be affected.

a. The inner diameter of the upstream and downstream process pipes is the same as the inner diameter of the sensor, and should meet: 0.98DN≤D≤1.05DN (where DN: sensor inner diameter, D: process pipe inner diameter)

b. The process tube and sensor must be concentric, and the coaxial deviation should not be greater than 0.05DN

2.3. Requirements for bypass pipes

In order to facilitate the maintenance of the flow meter, a bypass pipe must be installed for the flow meter. In addition, for heavily polluted fluids and where the flow meter needs to be cleaned but the fluid cannot be stopped, a bypass pipe must be installed.

a. Convenient maintenance of flow meter

b. Must be installed for heavily polluted fluid

c. The flow cannot be stopped and the flow meter needs to be cleaned

3． Installation requirements for plug-in electromagnetic flowmeter

3.1. Requirements for straight pipe sections

Inlet/outlet straight pipe sections: the entrance should be ≥10×DN; the outlet should be ≥5×DN

3.2. Requirements for grounding points

In order to make the instrument work reliably, improve measurement accuracy, and not be interfered by external parasitic potentials/sensors should be well grounded, with a grounding resistance of less than 10. (If the metal pipe is well grounded, there is no need to Dedicated grounding device) 3.3 The installation location requirements are as shown in the figure

Insert the electromagnetic flowmeter according to the on-site pipeline conditions. The flowmeter without ball valve should be installed on the pipeline without overturning. Installation (that is, without pressure installation, you can choose a flowmeter without a ball valve), open a hole with a diameter of 50 on the pipeline, and prepare to weld the connecting welded pipe to the opening of the pipeline; for occasions that require continuous flow loading and unloading or do not allow the medium to overflow , a ball valve must be installed, that is, a plug-in electromagnetic flowmeter with a ball valve structure must be selected; a hole with a diameter of 50 mm is made on the pipe, and the connecting welded pipe is prepared to be welded to the hole in the pipe.

Selection of plug-in electromagnetic flowmeter

Measurement range: Recommended range of use: 0.5m/s～10m/s continuously adjustable. Range of use: 0.2m/s ~ 15m/s continuously adjustable

Signal output: 1. The switch value can be set to: pulse output (1000HZ); high/low flow alarm; empty pipe alarm; flow direction Signal;

Fault alarm; 2. Current output: 4-20mA output

Configuration method: 1. On-site configuration through three manual keys. 2. On-site configuration through remote control. 3. Perform on-site configuration through the handheld terminal.

Memory: EEPROM memory that will not disappear, no need for battery storage.

Instructions for use of IFM electromagnetic flowmeters

IFM electromagnetic flowmeters are widely used in sewage, fluorine chemicals, production water, tap water industry, medicine, steel, etc. Many aspects. Because of the principle, it can only measure conductive liquids. Although it is much better than other types of flowmeters in terms of reliability and stability, customers may still encounter some problems during actual use. Let me talk in detail about the selection and installation of electromagnetic flowmeters: < /p>

First, like other flowmeters, although the measurement range ratio of the electromagnetic flowmeter is 30:1, which is higher than the vortex flowmeter and differential pressure flowmeter, it also has limitations. Many When customers order a meter, they often compare it with a water meter, thinking that it can measure very low flow rates. Under normal circumstances, it can only measure 0.1m/s. Below this flow rate, it is difficult for the electromagnetic flowmeter to measure correctly. Therefore, it is necessary to clarify the flow range ratio at the initial stage of ordering. When ordering, you cannot order based on the original pipe caliber. You must determine the instrument caliber based on your actual flow rate.

Second, like other flowmeters, electromagnetic flowmeters also have requirements for straight pipes before and after installation, but they are more demanding than other types of flowmeters.Lower, but the key point is to be satisfied: full control, then full control. When the tube is not full, it is easy to cause the flow meter to jump randomly:

3. Like other flow meters, electromagnetic flow meters also have protection levels. Generally, the protection level of the integrated type is IP65, and the split type is IP68 (for For sensors), if the customer has requirements for the installation environment of the instrument and the installation location is in an underground well or other humid place, it is recommended that the customer choose a split type. In order to avoid damage to the instrument caused by wrong selection.

Fourth, electromagnetic flowmeters can measure corrosive liquids, but customers must correctly provide other measurement medium properties at the initial stage of ordering to avoid errors in electrode selection during model selection, which may cause the sensor to be scrapped during later use. , causing inconvenience and economic losses to customers.

Fifth, although the electromagnetic flowmeter has relatively good reliability and will not be damaged under normal circumstances, due to its principle, the sensor electrode surface is always in contact with the liquid. Over time, the electrode surface is more susceptible to contamination. Therefore, under normal circumstances, if the customer has the conditions to dismantle the electromagnetic flowmeter, it is recommended to disassemble it and clean the electrodes once every one to one and a half years to ensure the measurement accuracy of the entire flowmeter. Any instrument requires "maintenance", and electromagnetic flowmeters are no exception.

6. When the main pipeline is a vertical pipeline, under normal circumstances, the water flow is required to be from bottom to top, and try not to flow from top to bottom. The latter can easily cause large flow fluctuations. In addition to the full pipe installation, this is also very important, followed by the distance between the front and rear straight pipes.

Choose a place that is convenient for maintenance and movement. The flow meter should be installed at the rear end of the water pump and never on the suction side; the valve should be installed on the downstream side of the flow rate.

How to use IFM electromagnetic flowmeter

The electromagnetic flowmeter has two operating states: automatic measurement state and parameter setting state.

When the meter is powered on, it automatically enters the measurement state. In the automatic measurement state, the electromagnetic flowmeter automatically completes each measurement function and displays the corresponding measurement data. In the parameter setting state, the user uses four panel keys to complete the instrument parameter setting.

1. Key function

1.1 Down key function in automatic measurement state

Down key: cycle through the lower display content of the screen;

Up Key: Cycle through the upper row display content on the screen;

Composite key + Confirm key: Enter the parameter setting state;

Confirm key: Return to the automatic measurement state;

Measurement In this mode, the contrast of the LCD display is adjusted: for small LCDs, press "composite key + up key" or "composite key + down key" for a few seconds; for large LCDs, adjust the potentiometer on the back of the large LCD.

1.2 Down key function in parameter setting state

Down key: The number at the cursor decreases by 1;

Up key: The number at the cursor increases by 1;

Compound key + down key:The cursor moves to the left;

Composite key + up key: the cursor moves to the right;

Confirm key: enter/exit the submenu;

Confirm key: in any state down, press continuously for two seconds to return to the automatic measurement state.

Note: 1. When using the "composite key", you should first press the composite key and then press the "up key" or "down key" at the same time

2. In the parameter settings In this state, if there is no key operation within 3 minutes, the meter will automatically return to the measurement state.

3. To select the flow direction for flow zero point correction, you can move the cursor to the "+" or "-" on the left and use the "up key" or "down key" to switch it to the opposite direction to the actual flow direction.

4. To select the flow unit, move the cursor to the originally displayed flow unit in the "Flow Range Setting" menu, and then use the "up key" or "down key" to switch to suit your needs.

2. Parameter setting function key operation

To set or modify the parameters of the electromagnetic flowmeter, the flowmeter must enter the parameter setting state from the measurement state. In the measurement state, press the "composite key + confirm key" to display the state transition password (0000). According to the confidentiality level, modify it accordingly according to the password provided by the manufacturer. After pressing the "composite key + confirmation key" again, it will enter the required parameter setting state.

Installation of intelligent electromagnetic flowmeter sensors on process pipelines

1. The intelligent electromagnetic flowmeter detects blocked pipes and must be filled with medium at all times, and cannot be filled when the pipe is full or full. Works normally with empty pipe. When the medium is not full in the pipe, the method of raising the height of the outlet pipe at the rear end of the flow meter can be used to fill the pipe with medium to prevent the pipe from being full and gas from adhering to the electrode.

2. Vacuum in the pipeline will damage the lining of the flow meter, so special attention is required.

3. The positive direction of flow should be consistent with the positive direction pointed by the arrow on the flow meter.

4. The intelligent electromagnetic flowmeter can be installed on straight pipes, or on horizontal or inclined pipes, but it requires the center line of the two electrodes to be horizontal.

5. For liquid and solid two-phase fluids, vertical installation is adopted to allow the measured medium to flow from top to bottom, which can cause the flow meter lining to wear evenly and extend the service life.

6. Ensure there is enough space near the pipe flange for flowmeter installation and maintenance.

7. If the measuring pipe vibrates, there should be fixed supports on both sides of the flow meter.

8. If the measuring medium is a heavily polluted liquid, install the flowmeter body in the bypass pipeline to drain and clear the flow without interrupting the process operation.

9.When installing a PTFE-lined flowmeter, the bolts connecting the flange should be tightened evenly, otherwise the PTFE lining will be easily crushed, so use a torque wrench.