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Differences between Tuning Fork Sensor, Strain Guage Sensor and Electromagnetic Sensor.
Tuning Fork sensor
─No trouble with high accuracy and fast response time. ─
Vibration frequency changes against the application of load to two piece coupled Tuning Fork. Scale measures this frequency change then convert to the weight value. Stress-strain of the Tuning Fork i s 1/10th and its output sensitivity is 50 times of Strain Gauge. This gi ves enormous difference in scale performance, such as resolution, st ability and repeatability.
Strain Gauge Sensor
─ Suitable for relatively heavy item and it is durable. ─
Applying load to Strain Gauge affixed metal makes gauge’s resister value change by metal strain. Strain Gauge type sensor measures the change of resister value then convert into weight value. Structure of the sensor is relatively simple so that sen sor cost is inexpensive, thus the sensor is suitable for heavy weight measurement. high-resolution weighing.
Electromagnetic Sensor
─ Suitable for weighing of extreme light weight and/or micro piece. ─
ElEtromagnetic force, raised by the combination of Magnet and Coil, makes in balance of applied load. Sensor measures the current flown in the coil to determine weight value. It is suitable for high accuracy (high resolution) measurement. It has been noted as suitable for smaller capacity and high-resolution weighing.
| Tuning Fork Sensor | Strain Gauge Sensor | Electromagnetic Sensor | |
|---|---|---|---|
| Scale capacity | 80g to 300kg | Few Hundred grams to few metric tons | Few grams to few kgs |
| Actual resolution | >1/3,000,000 | >1/20,000 | >1/60,000,000 |
| Long-term stability | High(1/200,000) | Low(1/10,000) | Normal(1/50,000) |
| A/D Conversion(Analogue/Digital) | N/A(Digital output) | Necessary(Analogue output) | Necessary(Analogue output) |
| Power consumption of Sensor | Externaly small (less than few percent of Strain Gauge type sensor) | Small | Large |
| Noise resistance | Strong | Weak | Normal |
| Warming up | Unnecessary (depend upon products and usage circumstances) | Necessary | Necessary |