Two metal plates opposite each other can store electric energy. This energy is referred to as capacitance.When any insulated substances such as powder and or a semiconductor enter passes between the two metal plates, the capacitance increases. This characteristic is referred to as the dielectric constant. If type of powder or granulated material does not change, this value is stable.
Feed powder or granulated material so that it falls between the two metal plate electrodes. Measure the capacitance between these electrodes continuously. Then, changes in the flow rate cause proportional changes in the capacitance.
The FM701 employs our highly sensitive, high-precision capacitance measurement equipment as a converter. By adding a flow rate conversion and integration unit, it is designed to be a flow rate measurement system without any mechanical or moving parts.
Flow meter for powders
FM-701 series
- Can measure the flow rate of powders and granulated materials that have previously been difficult to measure
No moving parts and long service life -
This meter measures the flow rate as powder or granulated materials fall between two metal plates.It has no mechanically moving part so it provides a long life and stable measurement.
The capacitance circuit uses the chopper method to switch the capacitance before the bridge input, meaning temperature differences have little effect.
Features, keys |Usages, use examples |Operation principle | Applications |Standard specifications
Features, keys
- Long service life
This meter’s simple design involves passing a powder between two metal plates. It has no mechanically moving part so it provides a long life and stable measurement. - Uses a history-making chopper method
The capacitance circuit uses the chopper method to switch the capacitance before the bridge input, meaning temperature differences have little effect. - Low cost
This meter is low in cost and easy to install. - You can directly read the integrated flow value and the instantaneous value
The analog meter directly reads the instantaneous flow rate. The digital meter directly reads the continuous integrated value and integrated values at specified intervals. - Improved operability and precision
The integrated microcomputer provides better operability and improved precision.
Usages, use examples
- Continuous flow rate measurement of powder and granulated materials
Operating principle
Applications
Standard specifications
converter
| Power input | 100 to 200V AC |
|---|---|
| Output |
4 to 20mA DC (load resistance 450Ω or less) DC0 to 10V DC(load resistance 5kΩ or less) (optional) |
| Measurement range | Full scale 0.1pF to 100pF |
| Linearity error | 0.1% or less |
| Temperature characteristics |
In the operating temperature range, zero point error is ±0.005pF or better Sensitivity error is ±0.5% x specified value, or better |
| Chopper frequency | 33.3mS (60Hz), 40mS (50Hz) |
| Electrode charging AC voltage |
72kHz±5% 5V(P-P) or less |
| Operating temperature range | -5 to +70 degrees |
Integrator
| Power input | 100V AC or 200V AC (specify when ordering) |
|---|---|
| Integration error | ±0.5%x specified value, or less |
| Signal input | 4 to 20mA DC (pulse frequency input is available as an option) |
| Output | Instantaneous flow rate: 4 to 20mA DC 0 to 10V DC Upper and lower limit contact points (1 transfer) |
| Integration value, parallel (Centronics style) | |
|
Serial (conform to RS-232C) (option) Upper limit contact point (1 transfer) |
|
| Control input | Auto zero, reset integration value, pause, start interval integration |
Please feel free to inquire us
