DCNF Electromagnetic Energy Meter

DCSF(DCNF) Electromagnetic Flow Energy Meter

Product Overview

The design, production, and calibration of the electromagnetic flow energy meter comply with the "JB/T9248-1999 Electromagnetic Flowmeter" standard. Before leaving the factory, the product undergoes strict testing of multiple technical indicators to ensure accuracy and reliability.

This flowmeter is suitable for measuring the flow of all conductive liquids with an electrical conductivity greater than 5 μs/cm. There are no moving or flow-obstructing components inside the measuring tube, resulting in minimal resistance loss and no clogging. The performance of the flowmeter is unaffected by changes in liquid pressure, temperature, or density. The sensor uses low-frequency multi-state excitation, which is immune to power frequency and various on-site interferences. It offers high measurement accuracy, excellent stability, and low installation requirements. The electromagnetic flow converter provides a stable excitation current to the sensor's excitation coil to maintain a constant magnetic field (B). At the same time, it amplifies the electromotive force induced by the sensor and converts it into a standard current signal or frequency signal, facilitating flow display, control, and adjustment.

When measuring flow, the conductive liquid cuts through a magnetic field perpendicular to the direction of flow, inducing a voltage signal proportional to the average flow velocity (i.e., volumetric flow). Therefore, the flowing liquid being measured must have a minimum electrical conductivity. This signal is detected by two electrodes in direct contact with the liquid and transmitted via cable to the converter, where it is converted into a unified standard signal. After a series of digital processing, both cumulative flow and instantaneous flow are displayed on the converter screen.

Flowmeter Installation Methods
(a) The flowmeter is usually installed horizontally, with the axes of the two electrodes at the same horizontal level.
(b) To prevent negative pressure, the flowmeter should be installed at a lower height than the pipeline, or sufficient back pressure should be ensured on the downstream side of the flowmeter.
(c) If the inner diameter of the flowmeter does not match the pipeline inner diameter, the pipeline inner diameter should be larger than that of the flowmeter, and a reducer or expander with a cone angle not exceeding 15° should be installed between them.
(d) For measuring solid-liquid two-phase flow, the flowmeter should be installed vertically with flow direction from bottom to top.
(e) To minimize the effects of vortices and flow field distortion, there are specific requirements for the lengths of straight pipe sections before and after the flowmeter; otherwise, measurement accuracy may be affected.
Straight Pipe Section Requirements for Flowmeter Installation
Pipeline Installation Type Front Straight Pipe (L1) Rear Straight Pipe (L2)
Horizontal Pipe 5D 3D
Bend 5D 3D
Flared Pipe 10D 5D
Downstream of Valve 10D 5D
Reducer 10D 5D
Downstream of Pump 15D 5D
Mixed Liquid 30D 5D
Note: D in the table refers to the inner diameter of the pipeline

Technical Parameters
Diameter DN10-DN1600
Accuracy ±0.5%±1.0%
Electrode Material 316, 316L, Hastelloy B, Hastelloy C, Titanium Ti, Tantalum Ta, Platinum Pt
Lining Material Neoprene, Polyurethane Rubber, PTFE F4, F46, PFA
Medium Conductive Liquids (including solid-liquid two-phase)
Measurement Error ±0.5%±1.0% flow rate (depending on diameter)
Medium Conductivity >5 μs/cm (water >20 μs/cm)
Flow Velocity Range 0.3~10.0 m/s (flow units optional)
Connection Flange HG20592-2009, DIN, ANSI, JIS
Medium Temperature -25°C to 80°C (rubber lining 65°C)
Rated Pressure 0.6MPa-4.0MPa (higher pressure available upon request)
Output Signal 4-20mA current output, 0-5KHz frequency/pulse output
Protection Rating IP65, IP67, IP68 (remote type)
Network Function MODBUS, RS-232, RS-485, HART communication interface
Application HVAC, acids, alkalis, water supply and drainage, food, pulp, etc.
Display Flow rate, forward/reverse cumulative flow, forward/reverse cumulative difference, percentage, flow velocity
Language Chinese/English
Power Supply 220V AC, 24V DC
Assembly Type Integral, Remote
Installation Method Flange type, Clamp type