Chapter 3 Installation
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interference to the meter flow indication. In this case, it is recommended to inject
chemicals from the downstream of the meter; if chemicals must be injected from
the upstream of the meter, it must be ensured that the straight pipe section on the
upstream at least has 30 times of pipe diameters to ensure adequate mixing of
liquids.
(11) Grounding
As the voltage of induced signal of electromagnetic flowmeter is small, it’s more
prone to be affected by noises or other electromagnetic signals. This is why the
electromagnetic flowmeter needs to be grounded in many occasions. This
functions to form an internal space for shielding external interference through the
grounding of flowmeter casing, thereby improving measurement accuracy.
3.6. Mechanical installation
3.6.1. Installation of flowmeter pipeline
(1) Prior to installation, the pipeline shall be calibrated to ensure that the diameter
of the meter has good coaxiality with the user’s pipeline. For sensors with a
nominal diameter of no more than 50mm, the protrusion of its axis shall not exceed
1.5 mm; for sensors with a nominal diameter of 65~300 mm, it shall not exceed
2mm and for sensors with a nominal diameter of no less than 350 mm, it shall not
exceed 4 mm.
(2) In general, foreign matters (such as welding slag) may exist in newly installed
pipelines. Before the flowmeter is installed, wash away the debris. It not only
prevents the lining from being damaged but also measurement error caused by
foreign matters which pass through the measuring tube during measurement.
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