Features and Applications

P-FM910-E series smart electromagnetic flow meter design using latest technology is made for high performance and accuracy. It is capable of measuring normal or reverse flow measurement, positive or negative totalize flow, etc also for conductive liquids such as water, sewage, acid, alkali and salt as well as mixture of liquid and solid.

Technical Specifications

Power Supply: 240 VAC 50Hz or 24VDC
Power Consumption: ≤ 20W
LCD Display with Push Buttons: LCD with backlight displays percentage of flow, instantaneous flow and total flow, and alarm status.
Totalizer: It’s used for calculating the accumulative total for forward and reverse flow.
Output Signal: 4-20mA: Load Resistance 0 ~ 750ohms, 0-10mA: Load Resistance 0~1.5 Kohms for Flow Rate.
Frequency Output: Forward and reverse flow output with frequency range set between 1 ~ 5000Hz. The external voltage must be lower than 35V and the maximum output current is 250mA when the transistor is turned on.
Alarm Output: Two outputs from the collectors of photoelectric isolate transistors are for alarm signals. The external voltage must be lower than 35V and the max output current is 250mA when the transistor is turned on. Alarms are set for empty pipe, excitation circuit failure, flow limit exceeded, etc.
Pulse Output: For output in forward and reverse flow measurement, upper frequency of pulse output can be up to 5000 Hz. The flow per pulse is from 0.0001 to 1.0m3/pulse. The width of the pulse can be set to 20ms or square waveform automatically. The collector of transistor with photoelectric isolation is an open circuit. The external voltage must be lower than 35V and maximum of output current is 250mA when the transistor is turned on.
Accuracy: ±0.5% of reading, ±0.3% or 0.2% available
Damping Time: Adjustable between 0 and 100%
Communication Interface: RS-485 MODBUS RTU
Power Failure: A fail-safe clock is designed in the flowmeter, which can save the power failure event
for up 16 records (F1F0).
Protection: IP65/IP67 (dustproof and submersion for short time)
Pipe Sizes: DN6 ~ DN1000
Nominal Pressure: 0.6 ~ 4.0 Mpa
Accuracy: ±0.5% of reading, ±0.3% or 0.2% available
Liner Material: PTFE, PFA, FEP, Neoprene, Polyurethane, etc.
Electrode Material: SUS316L, Hastelloy-B, Hastelloy-C, Titanium, Tantalum, Platinum-iridium, Stainless steel
covered with tungsten
Medium Temperature:

Remote Type:

 Integral Type: -100C ~ + 800C

Neoprene and Polyurethane Liner – -100C ~ +800C
PTFE, PFA and F46 Liner – -100C ~ +1600C
Ambient Temperature: -250C ~ + 600C
Ambient Humidity: 5 ~ 100% RH
Medium Conductivity: ≥ 5 S/cm
Measuring Range: 1500:1, flow velocity ≤ 10 m/s

Measuring Principle

The measurement of flow rate of the electromagnetic flowmeter is based on Faraday’s law of electromagnetic induction.
When the conductive liquid moves within the magnetic field, voltage is induced in it, whose magnitude is proportional to the velocity of the conductor. The equation is as below;

  • E=KBVD
  • K: Coefficient of the flowmeter
  • B: Pulsed magnetic flux density
  • V: Average velocity of the media
  • D: Inner diameter of the measuring pipe

Dimensions

Nominal Pressure Meter Size and Dimensions
PN10 inch mm L D inch mm L D
½ 15 200 89 8 200 350 343
8/4 20 200 98 10 250 400 406
1 25 200 108 12 300 400 482.6
1-1/4 32 200 117 14 350 400 533
1-1/2 40 200 127 16 400 450 597
2 50 200 152 20 500 450 699
2-1/2 65 200 178 24 600 600 813
3 80 250 190 30 750 750 985
4 100 250 229 36 900 900 1170
5 125 250 254 40 1000 1000 1289
6 150 300 279

Selection Principles

The medium being measured must be conductive liquid whose electrical conductivity should be more than 5 μ S/cm. The medium shouldn’t contain too much magnetic matter or air bubble. Pressure rating, lining material, electrode material and the configuration type should be selected according to the medium’s temperature, corrosiveness, abrasiveness, etc. Also, the following points should be considered;

    • Normally, the size of the meter should be the same as the pipe size.
    • Recommended flow velocity is 1 ~ 3 m/s if the medium contains particles. If the actual flow velocity is too big, the select higher size to reduce the flow velocity and the abrasion onto the pipe wall.
    • Recommended flow velocity is 2 ~ 5 m/s if there is deposit in the pipe. Select lower meter size to increase the flow velocity and reduce the negative influence on the accuracy by the deposit if the actual flow velocity is too low.
    • If the flow velocity is too small and a high accuracy is required, then smaller meter size is recommended to increase the flow velocity and ensure the accuracy.

Velocity-Flow Rate Table

Pipe Size Min. Flow Rate

(0~0.5 m/s)

 Max. Flow Rate

(0~10 m/s)
mm Inch l/min, m3/h l/min, m3/h
10 3/8 0 ~ 2 l/min 0 ~ 40 l/min
15 1/2 0 ~ 5 l/min 0 ~ 100 l/min
20 ¾ 0 ~ 7.5 l/min 0 ~ 150 l/min
25 1 0 ~ 10 l/min 0 ~ 200 l/min
32 1.25 0 ~ 20 l/min 0 ~ 400 l/min
40 1.5 0 ~ 30 l/min 0 ~ 600 l/min
50 2 0 ~ 3 m3/h 0 ~ 60 m3/h
65 2.5 0 ~ 6 m3/h 0 ~ 120 m3/h
80 3 0 ~ 9 m3/h 0 ~ 180 m3/h
100 4 0 ~ 12 m3/h 0 ~ 240 m3/h
125 5 0 ~ 21 m3/h 0 ~ 420 m3/h
150 6 0 ~ 30 m3/h 0 ~ 600 m3/h
200 8 0 ~ 54 m3/h 0 ~ 1080 m3/h
250 10 0 ~ 90 m3/h 0 ~ 1800 m3/h
300 12 0 ~ 120 m3/h 0 ~ 2400 m3/h
350 14 0 ~ 165 m3/h 0 ~ 3300 m3/h
400 16 0 ~ 225 m3/h 0 ~ 4500 m3/h
450 18 0 ~ 300 m3/h 0 ~ 6000 m3/h
500 20 0 ~ 330 m3/h 0 ~ 6600 m3/h
600 24 0 ~ 480 m3/h 0 ~ 9600 m3/h
700 28 0 ~ 660 m3/h 0 ~ 13200 m3/h
800 32 0 ~ 900 m3/h 0 ~ 18000 m3/h
800 36 0 ~ 1200 m3/h 0 ~ 24000 m3/h
1000 40 0 ~ 1350 m3/h 0 ~ 27000 m3/h