『Emerson electromagnetic flowmeter』Related information(clamp on meter|electromagnetic meter|venturi meterrotameter|orifice meter|ultrasonic flow meter|mass flow meter|coriolis mass flow meter|coriolis flow meter|magnetic flow meter|magmeter flow meter|magflow flow meter|mag meter flow meter|electromagnetic flow meter|vortex flow meter|turbine flow meter|thermal mass flow meter|thermal flow meter|rotameter flow meter)
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
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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.
2. How to select Emerson flow meters based on pipe diameter
Emerson flow meters are mainly selected based on the type of flow meter and the actual flow range. The core is to match the pipe diameter with the flow range to avoid a decrease in measurement accuracy or equipment damage caused by improper pipe diameter.
. 1. The range of pipe diameters and the type of flow meter are compatible with Emersons mainstream flow meters. The range of pipe diameters is different. The Coriolis flow meter is suitable for small pipe diameters, usually DN6-DN200 (1/4 inch -8 inches). Based on the principle of Coriolis force, it has high measurement accuracy for fluid density and mass flow, and is commonly used for small flow additive transportation in the chemical industry. Electromagnetic flowmeter: suitable for a wide range of pipe diameters, from DN6-DN3000 (1/4 inch -120 inches), using the principle of electromagnetic induction to measure the volumetric flow rate of conductive liquids. Large pipe diameters ar
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