SPI MM800 Magnetic Flowmeter for Conductive Liquids
The SPI MM800 is an electromagnetic flowmeter for measuring the volumetric flow of electrically conductive liquids. It can be considered for water and other compatible process liquids, subject to the conductivity, wetted materials and operating limits of the selected configuration.
The range includes different sensor connections and converter arrangements. Seacom helps match these options to your pipework, liquid characteristics, available power supply and measurement requirements.
How Electromagnetic Flow Measurement Works
An electromagnetic flowmeter applies Faraday's law of induction. As a conductive liquid moves through the sensor's magnetic field, it generates a voltage detected by the electrodes. The converter processes this signal to determine flow.
The measuring principle uses no rotating gears or turbine blades. Reliable measurement requires sufficient liquid conductivity, correct installation and appropriate electrical grounding. A full-bore sensor must remain completely filled with liquid.
Converter and Sensor Options
Choose the converter arrangement and sensor construction together. The available combinations, power requirements and outputs should be confirmed for the specific model being ordered.
| Configuration | Selection considerations |
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| Compact converter |
An integral arrangement for installations where the display and controls can be accessed at the measuring point. |
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| Remote converter |
Separates the converter from the sensor so the display can be positioned in a more accessible location. Confirm cable requirements and installation limits. |
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| Battery-powered converter |
An option where external power is inconvenient. Confirm the measurement interval, battery requirements and available outputs for the selected version. |
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| Flanged sensor |
Select the nominal size, flange standard, pressure rating, liner and electrode materials to suit the pipework and liquid. |
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| Wafer sensor |
Check compatibility with the mating flanges, installation dimensions and process conditions. |
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| Tri-clamp sensor |
For compatible clamp-connected pipework. Confirm connection dimensions, wetted materials and cleaning requirements. |
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| MM800C insertion sensor |
Requires application-specific review of pipe dimensions, insertion depth, flow profile and mounting position. Its installation requirements differ from a full-bore meter. |
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Is a Magnetic Flowmeter Suitable for Your Liquid?
Electrical conductivity is a key selection requirement. Magnetic flowmeters can be considered for conductive water-based liquids, but suitability must be checked against the selected meter's minimum conductivity requirement.
- Water and utility systems: provide the water quality, operating flow range and pipe details.
- Cooling-water circuits: identify any glycol or other additives and confirm the mixture's conductivity and material compatibility.
- Process liquids: review chemical compatibility with the liner, electrodes and other wetted components.
- Liquids containing solids: describe the solids, concentration and potential for abrasion or electrode coating before selecting the sensor.
Conventional magnetic flowmeters are unsuitable for gases and non-conductive liquids such as most hydrocarbon oils. Very low-conductivity water also requires careful suitability checks. For compatible clean oils and other non-conductive liquids, consider the SPI MG oval gear flowmeter .
Information Needed for Model Selection
- Liquid: name, composition, conductivity and any suspended solids.
- Flow: minimum, normal and maximum operating flow rates.
- Process conditions: operating and maximum pressure and temperature.
- Pipework: internal diameter, pipe material, connection standard and available installation space.
- Materials: liner and electrode compatibility with the liquid and cleaning chemicals.
- Electrical requirements: available power supply, display location and required connection to a PLC or monitoring system.
- Installation environment: indoor or outdoor location, moisture exposure and access for inspection.
Installation and Commissioning
Follow the instructions for the selected sensor and converter. Review upstream and downstream pipework, nearby bends, valves and pumps before deciding where to install the meter.
- Keep the measuring section full: avoid positions where air can collect or the pipe can drain during measurement.
- Provide correct grounding: confirm the grounding arrangement for the pipe material, liner and sensor configuration.
- Check the flow profile: meet the specified straight-pipe and mounting requirements, especially for insertion measurements.
- Confirm electrical connections: check power, signal wiring and remote sensor cables before energising the equipment.
- Verify the configuration: check flow units, direction, output scaling and totaliser settings against the application requirements.
SPI MM800 Flowmeter Selection
Contact Seacom Process Instruments Sdn Bhd with your liquid, pipe size, flow range, pressure and temperature. Include the required power supply and output signals so we can help select the appropriate sensor and converter arrangement.
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MM800 Catalogue
(2.49M)
