Two Wire Electromagnetic Flowmeter DN25-DN200 Low Power High Integration

Price Negotiable

Price: Negotiable

MOQ: 1Set

Delivery Time: 5-8 work days

Brand: QINWEIYB

Product Description

Low-Power, High-Integration Two-Wire Electromagnetic Flowmeter

A two-wire electromagnetic flowmeter refers to an electromagnetic flowmeter that simultaneously accomplishes power supply and signal transmission using only two wires.

Core Advantages

Extremely low wiring cost and easy installation: Save a large amount of cable and construction costs. The traditional four-wire system requires two power lines and two signal lines, while the two-wire system only needs a pair of twisted wires, making it especially suitable for long-distance and multi-point distribution scenarios.
Inherent safety and explosion-proof advantage: As the entire circuit's energy is limited to 4-20mA and the voltage is usually at a low level of ≤24V DC, it is very easy to achieve Intrinsic Safety (Ex ia) certification, making it an ideal choice for hazardous areas such as chemical and petroleum industries.
Strong anti-interference ability: Current signal transmission is not sensitive to changes in line resistance and is less affected by electromagnetic interference, making it suitable for long-distance transmission.
"Live zero point" for easy diagnosis: The "live zero point" at 4mA can clearly distinguish between "instrument failure/power off (0mA)" and "true zero flow (4mA)", facilitating remote diagnosis.
Easy system integration: Seamless compatibility with current mainstream DCS/PLC control systems (whose analog input cards generally support two-wire 4-20mA power supply), without the need for additional power distribution.

Comparison with Four-wire Electromagnetic Flowmeters

Characteristics	Two-wire Electromagnetic Flowmeters	Four-wire Electromagnetic Flowmeters
Wiring	Two wires (power + signal)	Four wires (two power wires + two signal wires)
Power Supply	Loop-powered, DC 24V (commonly used)	Independent power supply, AC 220V or DC 24V
Power Consumption	Extremely low (must be ≤ 3.6mA @ 24V, i.e., ≤ 86.4mW)	High, unrestricted, can drive stronger excitation.
Maximum Distance	Limited by loop voltage drop, usually at the kilometer level.	Unrestricted power supply distance, signal transmission distance the same as two-wire.
Intrinsic Safety	Easy to achieve, preferred in hazardous areas.	More complex to achieve, usually flameproof (Ex d).
Cost	Low wiring cost, the meter itself may be slightly more expensive.	High wiring cost, the meter may be cheaper.
Applicable Scenarios	High explosion-proof requirements, scattered points, long distances, new digital factories.	Non-explosion-proof areas, on-site power supply available, occasions with extremely high requirements for response speed/functions.

Typical application scenarios

Hazardous areas in oil, chemical, natural gas, etc.: tank farm metering, process pipelines, flammable and explosive media.
Water treatment and municipal water networks: distributed water supply/drainage monitoring points, remote transmission water meters.
Energy management and building automation: central air conditioning cold/hot water metering, district heating metering.
Equipment matching and OEM: integrated into complete sets of equipment (such as water treatment units, chemical equipment).
Newly built digital factories: all plant instrument signals uniformly adopt two-wire 4-20mA standard.

Two-wire electromagnetic flowmeters are a successful example of the development of electromagnetic flowmeter technology towards "low power consumption, high integration, and intrinsic safety". It is not merely a change in wiring method, but also an innovation in system design concept.