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Quick Answer: Siemens mag flow meters connect to SCADA through 4-20 mA HART, pulse, Modbus RTU, or PROFIBUS DP. Most plants get reliable signals with 4-20 mA HART, damping set to 1-3 seconds, and the shield grounded at one end only. Silver Automation Instruments supplies compatible mag flow meters and pre-sets transmitter settings for your SCADA tags.
Many water plants run SITRANS FM MAG 5100 W flow tubes with MAG 6000 transmitters. The MAG 6000 supports 4-20 mA, HART, pulse, and internal totalizers. Some networks use the battery powered MAG 8000 for district metering and irrigation. The SCADA integrated elements on these meters include analog current output, pulse frequency output, digital communication port, and alarm flags for empty pipe or high flow.
Silver Automation Instruments stocks electromagnetic flow meters from DN15 to DN2000. We often replace failed sensors or transmitters without changing the SCADA address map. A customer in Vietnam recently replaced a DN150 raw water meter with one of our remote style mag meters. The PLC kept the same 4-20 mA scaling from 0 to 180 m3 per hour.
Configuration depends on the SCADA protocol. For a simple flow reading on a PLC analog input, use 4-20 mA with HART. For totalized volume, use a pulse output into a digital input. For Modbus RTU networks, the RS-485 terminals on a MAG 6000 or compatible transmitter carry flow rate, totalizer, and diagnostic data on two wires.
Here is a practical list for field engineers:
Most engineers skip PROFIBUS unless the plant already has a DP segment. For new remote sites, Modbus RTU is easier to test with a laptop and a USB to RS-485 adapter.
In practice, a bad damping setting causes more SCADA alarms than sensor failure. Set damping to 1 to 3 seconds for raw water flow. Use 5 to 10 seconds for sludge or chemical dosing lines where flow pulses. Set the low flow cut off near 0.1 m per second to stop zero drift. Set the 4 mA value at zero flow and the 20 mA value at your maximum expected flow. Keep the maximum flow at 110 to 120 percent of the normal pipe capacity.
For Modbus RTU, set the device address from 1 to 247. Use 9600 or 19200 baud and even parity as a starting point. Match the PLC port settings before testing the loop.
For pulse output, choose a pulse volume that does not exceed the PLC scan time. A DN100 meter with a flow range of 0 to 100 m3 per hour can send one pulse per 0.1 m3. The pulse rate comes to about 0.28 pulses per second at normal flow. A paint manufacturer in Southeast Asia used a pulse per liter setting and flooded the PLC input. We changed the pulse value to one pulse per 10 liters and solved the problem without rewiring.
Use shielded twisted pair cable for 4-20 mA and Modbus runs. Earth the shield at the PLC end only. Do not ground both ends. Grounding both ends creates a ground loop. For long runs above 100 meters, use a loop isolator for 4-20 mA and 120 ohm termination at the last Modbus device. Separate signal cable from VFD motor cables by at least 300 mm in cable trays.
For ATEX Zone 1 areas, use a remote transmitter and keep the converter outside the hazard area if possible. A remote transmitter keeps hot work and commissioning simpler.
We have seen customer sites in the Philippines where flow readings jumped every time a pump started. The cause was a shared cable tray with unshielded signal wire. Re-running a shielded twisted pair fixed the signal. These small site details matter more than the transmitter brand.
A common job for Silver Automation Instruments is supplying a mag flow meter with the same output and scaling as an existing Siemens Mag 5000 or 6000. Provide us the old transmitter settings, pipe size, liner material, and electrode material. We pre-set the current output, pulse value, damping, and Modbus address before shipping. The replacement meter then drops into the same SCADA point without new tags or PLC logic changes.
For chemical dosing, specify PFA liner and Hastelloy C electrodes. The fluid conductivity must stay above 5 µS/cm for stable readings. Send us your pressure in bar, temperature in degrees Celsius, pipe size in DN, and flow range. Also include the SCADA protocol. We respond with a quote for a compatible meter or a complete flow tube with transmitter. Tel: +86-25-68650347. Whatsapp: +86-25-52155837. WeChat: +86 15365082610.
Can a Silver Automation Instruments mag flow meter replace a Siemens Mag 5100 W without changing the PLC program?
Yes. We match the 4-20 mA scaling, pulse value, and HART device tag. In most cases the SCADA point uses the same engineering units and alarm limits.
What is the best output for a new SCADA mag flow meter installation?
Modbus RTU over RS-485 is a good default for new remote sites. Modbus RTU gives flow rate, total, and diagnostics on one pair of wires. For simple analog replacement, use 4-20 mA HART.
How long can the signal cable run for a mag flow transmitter?
With 4-20 mA, runs up to 500 meters are possible if the loop power supply is sufficient. For Modbus RS-485, keep total segment length under 1000 meters and use 120 ohm termination at both ends.
Do you supply battery powered mag flow meters for district metering like the Siemens MAG 8000?
We offer battery powered electromagnetic flow meters for DN25 to DN300 lines. They suit irrigation canals, district metered areas, and remote water wells where no mains power exists.
What information do you need for a quote?
Send pipe size, liner and electrode material, flow range, process pressure, process temperature, and SCADA output. Also tell us the existing transmitter brand and model if the job is a replacement.
For a quick price on a DN50 to DN600 mag flow meter with Modbus RTU, pulse, or 4-20 mA HART, contact Silver Automation Instruments. Send your flow range in m3/h or kg/h and transmitter settings. Web: flow-meter.com.au. Tel: +86-25-68650347. Whatsapp: +86-25-52155837. WeChat: +86 15365082610.
