Faraday’s law of electromagnetic induction states that an inductive voltage is generated when a conductor moves through a magnetic field. This principle is used as the basis of flow measurement in the RBEF electromagnetic flow meter. In the electromagnetic flow meter, the flowing fluid corresponds to the moving conductor as described in Faraday’s law.
UE ∞ B * D * v
The induced voltage UE is directly proportional to magnetic field intensity (B), electrode spacing (D) and average fluid velocity (v). Since magnetic field intensity (B) and the electrode spacing (D) are constant values, induced voltage UE is therefore directly proportional to the average flow velocity (v).
Q = (∏ * D2) / 4 * v therefore UE ∞ Q
The equation for calculating volumetric flow rate (Q) shows that the induced voltage (UE) is linear and directly proportional to the average velocity (v). In the flowmeter transmitter, the induced voltage (UE) from the electrodes is used to calculate volumetric flow rate (Q) based upon the pipe’s internal diameter.
UE = Induced voltage
B = Magnetic field strength
D = Electrode spacing
V = Fluid velocity
Q = Instantaneous volumetric flow rate
RBEFC Magnetic Flow Converter/Transmitters have Compact type and Remote type:
1. Programmable low frequency square wave field excitation, improving measurement stability and reducing power consumption;
2. Implementing 16 bits MCU, providing high integration and accuracy;
3. Full-digital processing, high noise resistance and reliable measurement;
4. Low EMI switching power supply, providing wide mains range adaptability, high efficiency and low temperature rising;
5. User-friendly operation interface;
6. High definition LCD display with backlight and -20℃ - +70℃ temperature range;
7. Forward and reverse measurement;
8. Three independent 10-digit totalizer: forward, reverse and net totalizer, convenient for metering or billing;
9. RS485 interface supporting up to 2km distance at 14400 bps communication;
10. Intelligent empty pipe detection and electrodes resistance measurement diagnosing empty pipe and electrodes contamination accurately;
11. Implementing ‘Rate-Of-Change Limit’ technology to eliminate sharp electrical noise contained in the flow signal and stabilize the display and outputs;
12. Totalizer remote control function, providing a contact for starting and stopping totalizing which is convenient for calibration synchronization or batch processing, System self-diagnosisn function;
13. Non-volatile memory, securing parameter settings and measurement data;
14. Optional real-time clock, power-failure and history data logging function ,storing up to 30 days measurement records;
15. On-site display
16. English & other languages
RBEFC Magentic Flowmeter Converter/Transmitter Specification
Housing Protection Class |
IP65 IP67 (Compact versions only) IP68 (Remote Versions Only) |
Remote Transmitter |
Pipe Mount or Wall Mount |
Available Power Supplies |
85…265VAC 16…36VDC |
Transmitter Configuration Options |
Front Panel Keypad Hand Held Infrared Programmer |
Output Signals |
1 x Active Current Output 1 x Passive Current Output 1 x Frequency / Pulse Output |
Status Outputs |
2 x Contact / Status Outputs for Upper and Lower Flow Limit |
Digital Communication |
RS485 Modbus, GPRS, Hart |
RBEFC Magentic Flowmeter Converter Model Selection | ||||||||||||
RBEFC- | X | X | X | X | X | |||||||
C | Compact | |||||||||||
R | Remote | |||||||||||
Power supply | ||||||||||||
AC | 90-260VAC, 50/60 Hz | |||||||||||
DC | 24VDC, ±10% | |||||||||||
Exicitation | ||||||||||||
H | High Frequency (25Hz) | |||||||||||
L | Low Frequency | |||||||||||
Output Type | ||||||||||||
S | 4-20mA, Pulse & RS232/RS485 | |||||||||||
M | Modbus | |||||||||||
G | GPRS(Only moudel) | |||||||||||
H | Hart | |||||||||||
O | Others(pls clarify) | |||||||||||
Excitation current | ||||||||||||
100mA | ||||||||||||
125mA | ||||||||||||
200mA | ||||||||||||
375mA | ||||||||||||
500mA | ||||||||||||
Special Function | ||||||||||||
0 | No | |||||||||||
T | Power off timer | |||||||||||
Q | Quantitative control | |||||||||||
R | IR Remote | |||||||||||
H | Cumulative hours | |||||||||||
J | Relay Output |
Magnetic Flow Converter /Transmitter Application:
We Supply:
Catalog- Electromagnetic Flow Converter/Transmitter(AC or DC)
Manual - Magnetic Flow Converter/Transmitter (AC or DC)
Other Files -Mag Converter/Transmitter (AC or DC)
Magmeters
Ultrassonic Flow Meter
Coriolis, Thermal Mass Flow Meter
Other Process Instrument