Abstract: Delta Bar Flow Meter is a plug-in flow meter. A delta bar sensor is inserted into the pipeline to generate a high pressure distribution in the forward flow direction and a low pressure distribution zone in the rear when the fluid flows through the sensor. This article mainly introduces the installation requirements and maintenance methods of the flowmeter for your reference.
Delta Bar Flowmeter Installation Requirements:
1. For Type I sensors, the detection rod has been welded to a section of pipe and the sensor must be in the direction of fluid flow during installation. The inner diameter of the process pipe is required to be the same as the inner diameter of the sensor, or the angle between the axis of the sensor and the pipe axis is at least zero within the required length range of the upstream straight pipe section.
For other types of sensors, the detection rod is inserted into the process pipeline. In addition to the total pressure hole, the position of the sensor detection rod must be perpendicular to the axis of the process piping. The allowable positional pressure deviation must be ensured.
The total pressure hole center of the sensor and the axis of the pipeline should be less than 7°
The sensor detection rod is inserted along the diameter of the pipe to the bottom with an angular deviation of less than 7°
The vertical pipe sensor can be installed at any position along the pipe circumference 360 ​​of the pipeline level. The high and low pressure impulse pipes should be on the same plane, as shown in Figure 6(a). When measuring the liquid, it should be installed at an incline to the downside; When measuring the vapor of gas, it should be tilted upwards to install 2. Straight section Because the sensor is based on the velocity area method, approximate integral theory is used and more points are used to describe it. The distribution equations are established under fully developed speed distribution conditions. Therefore, in order to obtain an ideal distribution, there must be a straight pipe segment with a certain length before and after the sensor. The installation position of the constant flow pipe flow sensor on the upstream side A on the downstream side B is provided with rectifiers without rectifiers on different planes in the same plane.
1, there is a 90 ° elbow or three-way 6D7D9D3D;
2, in the same plane there are two 90 ° elbow 8D9D14D3D;
3, there are two 90 ° elbows in different planes 9D19D24D4D;
4, the pipe diameter changes (receive or expand) 8D8D8D3D;
5, Partially open gate valve, ball valve or other throttle valve 8D8D8D3D.
Note: (1) "D" in the table is the inner diameter of the pipe. (2) In the absence of a pipeline segment, the upper stream should account for 70% of the total length of the pipeline and 30% downstream. At this time, a stable indication can still be given, but the accuracy is reduced. The device for clamping the sensor should ensure no leakage, no looseness, no displacement.
Delta Bar Flowmeter Maintenance:
Delta Bar Flowmeter sensors should be regularly cleaned during process pipeline overhaul. There are many ways to clean it. For example, the air source is used to blow off the accumulated dirt in the test tube. The kerosene and soft wire brush are used to clean the pressure holes. Possible cause of failure and removal methods: No. Causes of the phenomenon of faults Clearance method.
1, no differential pressure signal output: high and low pressure valve is not open, open the high and low pressure valve.
2, high and low pressure balancing valve is not tightened: tighten the balance valve 3, differential pressure signal output is too small: leakage of the lead pressure system; serious search, eliminate leaks.
4, improper matching of the secondary table range: adjust the upper and lower limits of the differential pressure transmitter 5, differential pressure signal output is too large: improper matching of the secondary table, adjust the pressure transmitter upper limit, back pressure hole Block, clean the constant velocity tube and remove the blockage.
Delta Bar Flowmeter Installation Requirements:
1. For Type I sensors, the detection rod has been welded to a section of pipe and the sensor must be in the direction of fluid flow during installation. The inner diameter of the process pipe is required to be the same as the inner diameter of the sensor, or the angle between the axis of the sensor and the pipe axis is at least zero within the required length range of the upstream straight pipe section.
For other types of sensors, the detection rod is inserted into the process pipeline. In addition to the total pressure hole, the position of the sensor detection rod must be perpendicular to the axis of the process piping. The allowable positional pressure deviation must be ensured.
The total pressure hole center of the sensor and the axis of the pipeline should be less than 7°
The sensor detection rod is inserted along the diameter of the pipe to the bottom with an angular deviation of less than 7°
The vertical pipe sensor can be installed at any position along the pipe circumference 360 ​​of the pipeline level. The high and low pressure impulse pipes should be on the same plane, as shown in Figure 6(a). When measuring the liquid, it should be installed at an incline to the downside; When measuring the vapor of gas, it should be tilted upwards to install 2. Straight section Because the sensor is based on the velocity area method, approximate integral theory is used and more points are used to describe it. The distribution equations are established under fully developed speed distribution conditions. Therefore, in order to obtain an ideal distribution, there must be a straight pipe segment with a certain length before and after the sensor. The installation position of the constant flow pipe flow sensor on the upstream side A on the downstream side B is provided with rectifiers without rectifiers on different planes in the same plane.
1, there is a 90 ° elbow or three-way 6D7D9D3D;
2, in the same plane there are two 90 ° elbow 8D9D14D3D;
3, there are two 90 ° elbows in different planes 9D19D24D4D;
4, the pipe diameter changes (receive or expand) 8D8D8D3D;
5, Partially open gate valve, ball valve or other throttle valve 8D8D8D3D.
Note: (1) "D" in the table is the inner diameter of the pipe. (2) In the absence of a pipeline segment, the upper stream should account for 70% of the total length of the pipeline and 30% downstream. At this time, a stable indication can still be given, but the accuracy is reduced. The device for clamping the sensor should ensure no leakage, no looseness, no displacement.
Delta Bar Flowmeter Maintenance:
Delta Bar Flowmeter sensors should be regularly cleaned during process pipeline overhaul. There are many ways to clean it. For example, the air source is used to blow off the accumulated dirt in the test tube. The kerosene and soft wire brush are used to clean the pressure holes. Possible cause of failure and removal methods: No. Causes of the phenomenon of faults Clearance method.
1, no differential pressure signal output: high and low pressure valve is not open, open the high and low pressure valve.
2, high and low pressure balancing valve is not tightened: tighten the balance valve 3, differential pressure signal output is too small: leakage of the lead pressure system; serious search, eliminate leaks.
4, improper matching of the secondary table range: adjust the upper and lower limits of the differential pressure transmitter 5, differential pressure signal output is too large: improper matching of the secondary table, adjust the pressure transmitter upper limit, back pressure hole Block, clean the constant velocity tube and remove the blockage.
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Name |
Wood printer |
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Print head |
DX5 |
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Printer size |
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Printing speed |
A4 photo/111s |
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Printng resolution |
5760*1440dpi |
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Nozzles |
90*6=540 |
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Interface |
USB2.0 |
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Net weight/Gross weight |
55Kg/60Kg |
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Printer size |
750*630*510mm |
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Height adjustment |
Automatic |
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Working power |
110V/220V 50/60Hz 30-75W |
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Operation system |
Windows 7/XP/2000/Vista etc |
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Temperature |
5-35º |
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