YOKOGAWA NFDV161-P

Digital guide

Product Introduction:
The NFDV161-P is a high-performance electromagnetic flowmeter from Yokogawa’s ADMAG N-F series, specifically engineered for water and wastewater applications. The N-F series emphasizes durability, reliability, and cost-effectiveness for municipal and industrial water treatment. The “P” output designation indicates 4–20 mA DC + Pulse output configuration.

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Detailed content

Measurement Principle:
Operates on Faraday’s Law of Electromagnetic Induction. A magnetic field is generated across the flow tube, and the voltage induced across the electrodes by the moving conductive fluid is directly proportional to the flow velocity. The N-F series features low-frequency rectangular wave excitation optimized for water and wastewater conductivity ranges.

Technical Specifications:

Parameter	Specification
Model	NFDV161-P
Pipe Size Range	DN25 to DN2600 (1″ to 102″)
Accuracy	±0.5% of reading
Repeatability	±0.2% of reading
Output (P)	4–20 mA DC + Pulse Output
Fluid Conductivity	≥ 5 μS/cm
Process Temperature	-10°C to +80°C (14°F to +176°F)
Process Pressure	Up to 1.6 MPa (232 psi)
Protection Class	IP68 (submersible)
Liner Material	Polyurethane Rubber, EPDM Rubber, Hard Rubber
Electrode Material	SUS316L Stainless Steel, SUS316L + PFA coating
Flange Standard	JIS 10K, JIS 20K, ANSI 150#, DIN PN10/16, BS 10#/16#
Power Supply	100–240 V AC, 50/60 Hz or 24 V DC
Communication	HART 7, RS-485 (Modbus RTU)
Approvals	JIS, JWWA, WRAS, FM, CSA, SIL2

Structural Features:

Wafer-type or flanged installation — no flanges required for DN25–DN150 (wafer)
IP68 rated — fully submersible in water/wastewater
Integral converter with backlit LCD display
Compact design — short face-to-face dimension for retrofit applications
Coated electrodes (PFA) for fouling resistance in wastewater

Performance Parameters:

Parameter	Value
Flow Velocity Range	0.3 to 10 m/s
Minimum Conductivity	≥ 5 μS/cm (water: ≥ 20 μS/cm recommended)
Response Time	≤ 1 second (95%)
Pulse Output Frequency	0 to 1 kHz
Zero Stability	±0.1% of span per year
Ambient Temperature	-20°C to +60°C
Display	128 × 64 pixel LCD with backlight

Key Advantages:

IP68 submersible rating — ideal for underground installations, wet wells, and sumps
Wide pipe size range (DN25 to DN2600) — covers small to large municipal mains
PFA-coated electrodes — resists coating buildup in dirty wastewater
JWWA and WRAS approved — certified for potable water applications
Low-frequency excitation — stable measurement in low-conductivity water
Pulse output for totalizer integration — direct connection to flow totalizers

Applicable Industries:

Municipal Water Supply and Distribution
Wastewater Collection and Treatment
Irrigation Systems
Industrial Water Recycling
Fire Protection Water Systems
Hydropower Plants

Installation Requirements:

Install in full-pipe conditions — the N-F series is NOT suitable for partially filled pipes
Maintain minimum 5D upstream and 3D downstream straight pipe
For wafer-type meters: install between matching flanges; use gaskets that do not protrude into the bore
For flanged meters: align flange bolt holes precisely; do not over-torque bolts
Ground the flowmeter and pipeline — essential for accurate measurement and noise rejection
Use shielded twisted-pair cable for all signal connections
Ensure the electrode axis is horizontal for sanitary/wastewater applications

Usage Precautions:

Never operate with an empty tube — this damages the rubber liner
In potable water applications, flush the meter with clean water before initial use
In wastewater with high solids content, install an upstream strainer (100 mesh minimum)
Clean electrodes monthly in heavily fouling wastewater; use soft brush and mild acid
Do not use abrasive cleaning tools on the electrode surfaces
Verify grounding periodically — poor grounding causes measurement drift
Do not exceed +80°C process temperature for rubber-lined models