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What are the technical requirements for electromagnetic flowmeter selection?

According to the main types and performance of typical mainstream products of electromagnetic flowmeters, the following requirements are met:

(1) Measured medium, measuring fluid The electromagnetic flowmeter can only measure conductive liquids, and cannot measure non-conductive fluids such as gases, oils and organic chemicals. Generally, a general type meter can be selected for fluids having a conductivity of 5 μS/cm or more. For liquids having a conductivity of 0.01 μS/cm or more, a slurry fluid containing solid particles and fibers, a capacitive electromagnetic flowmeter can be used.

(2) The nominal diameter DN (3'"'-'3OOO) mm has products.

(3) The excitation method includes rectangular wave excitation (bidirectional pulse, three-value wave, dual frequency), power frequency sine wave, and high frequency excitation mode.

(4) The measurement range is converted into flow rate: 0'"'-'0.3m/s to 0'"'-'12m/s.

(5) The measurement accuracy measurement error is ±(0.2'"'-'1)%FS, which is optional.

(6) Structural mode The combination of the sensor and the converter is optional, and the split type is optional.

(7) Wetted material:

1 lining with PTFE, rubber, polyurethane rubber, high purity alumina, ceramics.

The 2 electrodes include 316L stainless steel, Hastelloy B, Haman alloy C, aluminum, iron, conductive ceramics, and uranium alloy.

3 wetted parts 1Crl8Ni9Ti, containing Xinmei stainless steel 316L, Hastelloy B, Hastelloy C, tantalum, iron, conductive ceramics, lead alloy, etc.

(8) Electrode structure extrapolation type, interpolating type, and high purity alumina-body sintered type.

(9) Medium temperature Fluoroplastic: a 10'"'-'120 °C (integral type, split type 190 ° C). Rubber and polyurethane: 10'"'-'60 °C. High purity alumina: -10'"'-'160°ce is related to ambient temperature and working pressure).

(10) Connection type flange connection, clamping type, quick connector, clamp type.

(11) Power: AC: 85-----265yea.c.); The frequency is 50Hz and 60Hz. DC: 16-----36V (d.c.)

(12) Output signal: DC: 4r-....-20mA; Frequency: 0r-..-5kHz.

(13) There are three types of installations: DN50 pipe column mounting, wall mounting and panel mounting.

(14) Select the flow meter according to the purpose:

1 Continuous water immersion protection grade IP68: Most of the water supply and drainage and sewage treatment installations are underground wells. Rainwater and underground water seepage often cause the flowmeter to immerse in water or dew condensation in winter, reducing the insulation strength of the terminals and coils. Product performance and reduced flowmeter life.

2 Diving type: used for open channel flow measurement, replacing traditional canned flow meters.

3 explosion-proof type: used in the environment with explosive gas, such as chemical, coal, oil field.

4 Hygienic type: easy to disassemble, rinse and disinfect, can be installed quickly, suitable for food and medical departments.

5 high pressure type: for the petrochemical drilling cycle mud, cementing cement slurry, high pressure water injection in the oil recovery process.

6 general type: Applicable to the general use except the above.

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