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1. How to adjust parameters of electromagnetic flowmeter
Parameter adjustment of electromagnetic flowmeter needs to be configured according to the model and working conditions of the instrument. The core operations include setting the first number of the instrument system, adjusting the range, and calibrating the signal output. 1. Basic parameter settings • Instrument coefficient (K coefficient): Input according to the original coefficient marked on the sensor nameplate, usually the number of pulses per liter (e.g. 1.0000 represents 1L=1 pulse) • Measurement range: Calculated according to the pipeline diameter and flow rate range, the flow rate range of industrial pipelines is generally set to 0.5-10m/s • Flow unit: can choose m ³/h, L/min, kg/h, etc. (mass flow rate requires additional input of medium density) Medium parameter configuration • Conductivity threshold: usually set to 5 μ S/cm, below which an empty pipe alarm will be triggered • Density setting: When measuring mass flow, the current medium density value under the working condition needs to be input • Viscosity compensation: For high viscosity media, the viscosity compensation function needs to be enabled (dynamic viscosity value needs to be input) 3 Output signal calibration • 4-20mA output: - Zero calibration: adjust the output to 4mA in no flow state - Full range calibration: adjust the output to 20mA at rated flow rate • Pulse output: - Set the pulse equivalent (the flow value represented by each pulse) - Adjust the pulse width (usually set to 50-500ms) 4. Special function settings • Automatic air traffic detection: automatically reset the output when the pipeline is empty after being enabled • Flow direction judgment: forward/reverse flow dis
1. Parameter modification requires the use of specialized configuration software or handheld programmer provided by the manufacturer. 2 After modifying the key parameters, on-site real flow calibration must be carried out to verify the accuracy Parameter modifications involving safety interlocks require prior approval of process changes Electric lid opening operation is prohibited in explosion-proof situations and must be carried out after cutting off the power supply (note: specific operation should be based on the equipment manual, this article is written according to the current GB/T 18659-2018 national standard requirements for electromagnetic flow meters in 2024)
2. Measurement requirements for electromagnetic flow meters
Electromagnetic flow meters have strict requirements for measurement, mainly focusing on accuracy level and maximum allowable error. The accuracy level of flow meters is divided into several levels, namely 0.
2, 0.
5, 1.0, 1.5, and 2.5. The maximum allowable error for level 0.2 is ± 0.2%, and the level without parentheses is preferred. The maximum allowable error for each level is as follows: 0.2 level: ± 0.2% 0.5 level: ± 0.5% 1.0 level: ± 1.0% 1.5 level: ± 1.5% 2.5 level: ± 2.5%. For instantaneous flow indication, reference error can be used, and its maximum allowable error series must also comply with the above standards. For example, ± 0.5% FS. In the bidding document for the verification results, the citation error will be directly given without specifying the accuracy level. In the selection of error
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