Kofloc FM31 Series Small Karman Vortex Flow Meter employs the following principle for measurement of flows When a columnar object (object that generates vortices) is placed in the flow path of a fluid, regular channels of vortices, called Karman vortex channels, are generated at the back of the object.
Since the frequency of a vortex generated is linearly proportional to the flow velocity within a given range, the flow amount can be measured by counting the number of vortices. When the frequency of each vortex generated is detected by the incorporated vortex detector (piezoelectric device), the signal processing circuit outputs a signal which is linearly proportional to volume flow.
Kofloc FM31 Series Feature
- Because of no moving part, the meter has superior reliability and durability and no error in mounting position is produced.
- Simple construction (its flow path of fluid contains a columnar object and a vortex detector only) ensures low-pressure loss and low liquid leak. In addition, the detector does not get into contact with the fluid running through the path, therefore, it is ideal for process monitoring of various liquids.
- Two types of particle-free body materials (PPS and PFA) are available for choice according to your needs.
- Global specifications (Certification for CE Marking already acquired)
- Since Teflon is the material for the entire wetted part and no O-ring is in use, the Model31 Series Karman Vortex Flow Meter is optimum for monitoring liquid flows in the manufacturing process of semiconductors.
Applications
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- FA instruments
- Semiconductor manufacturing
- LCD
- Housing material production
- Medicine production
- Chemical industry
- Biomedical applications
- Environment systems
- Food processing
- Agricultural/Botanical applications
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Kofloc FM31 Series Specification
| Item | FM3101 | FM3102 | FM3103 | FM3104 | |
| Flow range (L/min) | 0.4-4 | 2-20 | 5-50 | 10-100 | |
| Connection | 3/8” Pipe end |
1/2” Pipe end |
3/4” Pipe end |
1” Pipe end |
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| Fluids for measurement | Ultrapure water, chemicals, and other liquids | ||||
| Measuring accuracy | ±3.0%+ 1 digit | ||||
| Repeatability | Within ±0.5% F.S. | ||||
| Liquid temperature range | 0-90℃ (No bedewing, no boiling) | ||||
| Amb. temperature range | 0-50℃ | ||||
| Outputs | With indicator | LED display in 3 digits | |||
| Current output: 4-20 mA (linear) | |||||
| Alarm output: Open collector (2 LEDs; 80 mA, 30 VDC max.) | |||||
| W/o indicator | Current output: 4-20 mA (linear) | ||||
| Pulse output: Open collector (10 mA, 30 VDC max.) | |||||
| Supply voltage | 12-24VDC | ||||
| Materials | Body | All Teflon® (PFA), without O-rings | |||
| Cover | Polybutylene terephthalate (PBT) resin | ||||
| Cable | 2 meters long; Conductor: Tinned bare annealed copper wire; Sheath: Heat-/cold-resistant polyvinyl chloride (POC) |
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Download Datasheet: Kofloc FM31 small vortex flowmeter