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E&h Electromagnetic Flow Meter Configuration: Step-by-Step Setup Tutorial
Quick Answer: E&h electromagnetic flow meter setup takes about 20 to 40 minutes on the local display. You mainly set the current output, pulse output, empty pipe detection, and flow range. After basic setup, verify with a process flow or a simulation signal.
What You Need Before You Start
Write down the line size, liner material, electrode material, flow range, and output signal type. Many E&h Promag units ship with a default access code. If the installation is new, check the sensor before you apply power. The pipe must be full of liquid. Air bubbles cause unstable readings. Conductivity must be above 5 µS/cm for most standard electromagnetic flow meters.
Step 1: Check the Installation Before Powering Up
Verify that the sensor has enough straight run. A common rule is 5 times the diameter upstream and 2 times downstream. For a DN100 meter, keep about 500 mm before the sensor and 200 mm after it. Check the gaskets. They must not protrude into the flow profile. An inserted gasket can cause a 2 to 5 percent reading error. Check ground rings on plastic or lined pipes. Metal pipes may ground through the process connection, but do not assume this.
Step 2: Wire the Power and Signal Outputs
Open the transmitter housing only after the power is off. Use a clean 24 V DC supply if the transmitter uses DC power. Check the nameplate before wiring. Connect the 4-20 mA HART output to the PLC input. Use shielded twisted pair cable. Keep signal cables at least 300 mm away from VFD motor cables. Connect the pulse output to a counter or PLC digital input.
Step 3: Set Basic Parameters on the Local Display
Select flow units such as m3/h or L/s. E&h electromagnetic flow meters measure volume flow directly, not mass flow. Enter the nominal diameter from the sensor nameplate. Do not enter the pipe size if the sensor has a reduced bore. For example, a DN50 sensor with a DN80 connection still uses DN50 in the setup.
Set the flow range that equals 20 mA. For a DN100 water line with 0 to 150 m3/h expected flow, set 20 mA equal to 150 m3/h. Set low flow cut off to 0.5 or 1.0 percent of full scale. This stops totaliser counting during no flow or small process pulsations.
Step 4: Set the Current Output and Pulse Output
Define the 4 mA and 20 mA values. Most water and wastewater sites use 4 mA at 0 flow. Chemical batching may need a bidirectional range. Set damping to 3 or 5 seconds for stable reading. For fast batching, use 0.5 to 1 second.
Set the pulse output in the totaliser menu. A pulse value of 0.1 m3 works well for a DN100 meter with a maximum flow of 150 m3/h.
Step 5: Empty Pipe Detection and Error Settings
Empty pipe detection stops the current output when the pipe drains. Enable it in the diagnostics menu. Set the empty pipe threshold based on measured conductivity. A typical start value is 0.5 µS/cm. Adjust upward if the meter still reads flow when the pipe is empty.
Select the fail safe mode. Common options are hold last value, output 22 mA, or output 2 mA. Most plants use 22 mA for high alarm because the PLC can detect it.
Step 6: Run a Flow Simulation 
Use the simulation function in the diagnostics menu. The transmitter can output a fixed current, such as 12 mA. Check the PLC or loop calibrator reading. If the 12 mA signal reaches the PLC, the wiring and scaling are correct.
Then run the process at a known flow rate if possible. Compare the totaliser over 10 minutes. A 2 percent deviation is normal at low flow. Above 10 percent of full scale, the reading should be within 0.5 percent. If the meter reads negative flow, check the flow direction arrow.
Common E&h Configuration Problems on Site
Most issues come from wrong line size entry, wrong current output scaling, or empty pipe detection disabled. We have seen a desalination plant in Oman with unstable reading because the filter screen was aerating the water. The flow meter was fine. The process was the problem.
Incorrect grounding on plastic pipes is another common issue. For HDPE or PVC lines, use grounding rings or lining protection electrodes. If you are replacing an older E&h unit, check the liner and electrode material. For chemical dosing, specify PTFE liner and Hastelloy C electrodes.
Recommended Silver Instruments Models for Similar Applications
Silver Instruments supplies electromagnetic flow meters for water, wastewater, chemical, and food and beverage lines. The standard SI-EMAG series covers DN15 to DN600 with hard rubber or PTFE liner, 316L electrodes, 4-20 mA HART output, pulse output, and RS485 Modbus. Accuracy is 0.5 percent of reading above 0.5 m/s.
For large water transfer lines, the sensor can be ordered in DN700 to DN1200. For seawater desalination plants, specify PTFE liner and titanium electrodes. Send us your pipe size (DN), flow range, pressure (bar), temperature (°C), and conductivity (µS/cm). We will send a quote for a direct replacement or a new installation.
FAQ: E&h Electromagnetic Flow Meter Setup
Q: Can I configure an E&h electromagnetic flow meter without opening the housing?
A: Yes. Use the local display buttons or FieldCare software with a HART modem.
Q: What should I set for low flow cut off?
A: Start with 0.5 percent of full scale. Increase it if the totaliser counts when the pump is off.
Q: Does an E&h magnetic flow meter need a straight run?
A: Yes. Keep 5 times the pipe diameter upstream and 2 times downstream if possible.
Q: What is empty pipe detection and should I enable it?
A: Empty pipe detection stops the output when the sensor is not full. Enable it for pump discharge lines, gravity drains, and batching applications.
Q: Can Silver Instruments supply a replacement for an older E&h electromagnetic flow meter?
A: Yes. Send us the existing model code, pipe size, liner, electrode, and output signal. We can match the process connection and propose a compatible unit.
Contact Silver Automation Instruments
If you need help with electromagnetic flow meter selection, configuration, or price, send your process data to Silver Automation Instruments.
Tel: +86-25-68650347
Whatsapp: +86-25-52155837
WeChat: +86 15365082610
Website: flow-meter.com.au
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