Electromagnetic flowmeter installation need to be aware of
Electromagnetic flowmeter in installation time need to pay attention to the following aspects:
The first, electromagnetic flowmeter installation location choice:
(1) choose where there will be no negative pressure measuring tube;
(2) avoid installation position around the corrosive gas or steam.
(3) avoid installed in a motor or transformer, such as better place, prevent cause electrical interference;
(4) mixed phase flow measurement, avoid to cause phase separation;
(5) environmental temperature manager to avoid direct sunlight;
(6) install where no vibration or choose small vibration, if the environment vibration, plus fixed on the sensor before and after the pipe support,
(7) installation indoors as far as possible, avoid by rain shower or submerged.
The second, the electromagnetic flowmeter installation requirement for straight pipe length:
Electromagnetic flowmeter requirement for straight pipe before and after is lower, generally elbow to 90 degrees, T section, reducer, full open valve components such as flow, from the middle line of electrode electromagnetic flowmeter anglo-irish has 5 D for electromagnetic flow meter diameter (D) of straight pipe; For different valve opening, the upstream side of the straight pipe length need 10 d; General sensor alumni straight pipe need to 3 d; Measuring the mixed liquid of different medium, in combination with the distance between the electromagnetic flowmeter at least more than 30 d.
The third, electromagnetic flowmeter installation position and direction of flow:
Electromagnetic flowmeter can be horizontal, vertical, and tilted installed on the pipeline. When mounted horizontally, the electromagnetic flowmeter electrode axis must be level, prevent due to the bubble of fluid with the insulation of the electrode for short periods of time, also can prevent electrode is covered by fluid in the sediments. Should not install the sensor at the highest location, so as to avoid gas accumulation. Vertical installation, should make the direction of flow upward, so that we can make no flow or traffic hours, fluid solid particles sinking, while the rise in light of lipid from electromagnetic flowmeter sensor electrode area, the measurement of mud and slurry viscosity high solid-liquid mixed media, avoid solid precipitation and sensor uneven friction lining.
Sensor measuring pipe must be full of fluid, there must be some back pressure. To breed a negative pressure, electromagnetic flowmeter should not be installed in the pump inlet, and the export should be installed in the pump, the tilt when installation, must be installed on the rise, in open discharge pipe installation, the lower part of the must be installed in the pipeline. Control valves should be installed on the downstream side of the sensor and the cut-off valve, and should not be installed upstream in sensors. Points are electromagnetic flowmeter excitation the connection between the cable and switches with special wiring is complete, converter and external electromagnetic flowmeter the connection of the same size.