EH flowmeter manual | Far East flowmeter password

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1. Accumulated flow rate of electromagnetic flowmeter

There are mainly two ways to obtain the accumulated flow rate of electromagnetic flowmeter: direct reading and formula calculation. Its accuracy is affected by instrument accuracy, fluid characteristics, and installation conditions.

1. Core method for obtaining cumulative traffic: 1 Directly read the instrument display. Most contemporary electromagnetic flow meters have built-in cumulative modules, and the main interface can directly display the total or difference value of forward and reverse flow. When operating, three points should be noted: • Refer to the instruction manual to confirm the function path, as there are differences in the menu hierarchy of different brands of instruments • Identify the type of integrator, and some devices have three independent sets of forward/reverse/differential data - pay attention to power-off protection function, high-quality instruments have built-in storage chips to prevent data loss. 2 The calculation method for obtaining cumulative values takes the 4-20mA output signal as an example, which is implemented in three steps: signal conversion: according to the formula $$\ text {real-time flow rate (L/s)}=\ frac {I-4} {16} \ times 50 $$, convert the current value into instantaneous flow rate. When a 12mA signal is detected, the corresponding flow rate is (12-4)/16 × 50=25L/s. Time integration: Set the sampling period to T seconds (usually 1 second), and the total flow rate within N seconds is $$\ sm_i=1 ^ {N} (\ text_i \ times T) $$. When working continuously for 30 minutes (1800 seconds), it is necessary to accumulate the instantaneous flow rate and time interval product of 1800 sampling points. Unit conversion:

When converting the calculation result from liters to cubic meters, attention should be paid to eliminating base errors. For a total flow rate of 1800L, dividing by 1000 yields 1.8m ³. At this point, it is necessary to confirm whether the instrument range covers the actual flow range. 2. Key factors affecting measurement accuracy in numerical states An instrument with an inherent error accuracy level of 1.0 means a measurement error of ± 1%, and continuous operation for 24 hours may result in cumulative errors of thousands of liters. Regular calibration can keep the error within the nominal range When the conductivity of the fluid is below 5 μ S/cm, there will be significant fluctuations in the measured values due to changes in the characteristics of the medium. The medium containing solid particles may alter the flow field distribution. It is recommended to install a straight pipe section with a diameter 10 times that of the instrument The interference caused by poor installation of standardized grounding can cause measurement values to deviate by more than 15%. It is necessary to ensure full pipe conditions, and the error may exceed 5% in non full pipe states. The installation position should avoid areas downstream of the pump valve that are prone to air bubbles. After understanding the core principle, it is recommended to prioritize the use of the instruments built-in accumulation function in practical applications. When manual calculation is required, it is recommended to shorten the sampling period to less than 0.5 seconds and use a data logger to achieve continuous integration calculation. For high-precision measurement scenarios, online calibration should be performed no less than twice a year.

EH flowmeter manual | Far East flowmeter password

1. Accumulated flow rate of electromagnetic flowmeter

2. Password

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