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1. Pulse parameters of Emerson 8705 electromagnetic flowmeter
The key settings of the pulse parameters of Emerson 8705 electromagnetic flowmeter can refer to the general electromagnetic flowmeter configuration logic, and the specific requirements should be based on the equipment manual. Based on the experience of setting general parameters, the core configuration points are as follows:
1. Wiring method • Active output: Terminal 57 (positive) and 58 (negative) are directly connected to the positive and negative terminals of the pulse receiving device. Passive output: Terminals 56 (positive) and 57 (negative) require an external 24V power supply. The positive end of the power supply is connected to terminal 56, 57 is connected to the positive end of the receiving device, and the negative end is connected to the negative end of the power supply. When the internal resistance of the receiving device is too low, a 1k Ω -10k Ω pull-down resistor needs to be connected in series
2. Parameter setting • Pulse equivalent: Calculated based on the maximum flow rate, for example, set to 0.1m ³/pulse when the maximum flow rate is 1000m ³/h, that is, output one pulse for every accumulated 0.1m ³. • Pulse width: Adjust the reference period, for example, when 1000m ³/h corresponds to a period of 330ms, the high-level time can be set to 130ms. • Pulse polarity: The default is positive pulse, which needs to be matched with the signal type of the receiving device. • Filtering parameters: Reduce interference by damping time (1-20 seconds), and it is recommended to set it for more than 5 seconds when the flow fluctuates greatly
3. Other commonly used reference values • Some electromagnetic flowmeters support a pulse
4. Operation precautions • The pulse output function should be enabled in cumulative flow mode and bidirectional flow detection should be turned off. The electrode material and lining need to be adapted to the properties of the medium (such as tantalum electrode/PTFE lining for corrosive liquids). The electrodes need to be cleaned quarterly to avoid attachments affecting signal stability.
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3. What are the flow meter products with similar accuracy to electromagnetic flow meters
Flow meter products with similar accuracy to electromagnetic flow meters mainly include Coriolis mass flow meters, high-precision pipe section ultrasonic flow meters, and high-precision turbine flow meters.
1. Coriolis mass flow meters.
The accuracy range is ± 0.05% - ± 0.2%, and some high-end models can achieve an accuracy of ± 0.05%, which matches the conventional accuracy range of electromagnetic flow meters. 2. It can directly measure mass flow without being affected by factors such as temperature, pressure, density, viscosity, etc., and can also output density and temperature parameters at the same time, with a large range ratio. 3. Representative products include Emerson high-precision series and Xingao Technology XMC series (optional ± 0.05% accuracy). 4. It is suitable for trade handover of crude oil, finished oil, chemical raw materials, liquefied gases,
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