Introduction
VN Series is an electromagnetic flow sensor designed for small pipe diameter and low flow. Electromagnetic flow sensor without moving parts suitable for use in machines. ・ With absence of moving parts, there is less failure due to its contaminants. ・ Low-pressure loss ・ No straight pipe required, compact design, and easy to install.
Features
- Electromagnetic flow sensor without moving parts suitable for use in machines.
- With absence of moving parts, there is less failure due to its contaminants.
- Low-pressure loss
- No straight pipe required, compact design, and easy to install.
Measurement Principle
By applying the Faraday’s law of induction, with a current
flowing through the coil to generate a magnetic field in the flow
path, an electromotive force is generated when a conductive
liquid passes through the flow path.
Electromagnetic force becomes signal which is proportional to
flow velocity, and this voltage is measured to convert it to flow
rate.
The flow rate is calculated by multiplying this flow rate by the cross-sectional area of the flow path.
Specification
| Model | VN05R | VN10R | VN20R | |
|---|---|---|---|---|
| Nominal Diameters | 5mm | 10mm | 20mm | |
| Accuracy-Guaranteed Flow Range | 0.05～1L/min | 0.5～10L/min | 3.0～60L/min | |
| Maximum Operating Flow Rate | 3L/min | 25L/min | 100L/min | |
| Low Flow Cutoff | 0.025L/min | 0.25L/min | 1.5L/min | |
| Accuracy (Liquid Temp. at 25℃) |
Frequency Pulse | ±2.5%RS (20% ~ 100% of maximum flow rate) ±0.5%FS (5% ~ 20% of maximum flow rate) *1 | ||
| Unit Pulse | ±2.0%RS (20% ~ 100% of maximum flow rate) ±0.4%FS (5% ~ 20% of maximum flow rate) *1 | |||
| Type of Fluid | Conductive fluid that does not corrode the material contacting to fluid (ex. cold/hot water) | |||
| Fluid Conductivity Range | 50μS/cm or more | |||
| Fluid Temperature Range | 0～+60℃ (No freezing) | |||
| Ambient Temperature / Humidity | Temperature: -20～+60℃ Humidity: 35～85％RH (No condensation) | |||
| Storage Ambient Temperature Range | -20～+70℃ | |||
| Working Pressure | 1MPa or less | |||
| Pressure Loss | 20kPa or less | |||
| Output 1 *3 | Spec. of Output | NPN open collector Current capacity: 20mA DC or less / Voltage: 30V DC or less / ON-time residual voltage: 1V or less Minimum pulse ON-time 2.5 ms (at 200 Hz frequency pulse) Duty ratio: 50% |
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| Frequency Pulse *2 | Standard 200.0Hz (Settable in steps of 0.1Hz between 20 and 400Hz upon delivery) Note: When connecting ASI-100, select 200.0 Hz for output 1. |
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| Unit Pulse | 0.001L/P (Standard) | 0.01L/P (Standard) | 0.1L/P (Standard) | |
| Alarm *4 | Selectable between Normal Open (Standard) and Normal Close Details of alarm (Excitation error / Memory error / Low source voltage / Dry moisture / Excessive fluid noise / Excessive flow rate / Reverse flow) |
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| Switch | Selectable between Normal Open (Standard) and Normal Close | |||
| Output 2 *3 | Spec. of Output | Same as Output 1 | ||
| Unit Pulse | Same as Output 1 | |||
| Alarm *4 | Same as Output 1 Note: When connecting ASI-100, select Alarm for output 2 |
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| Switch | Same as Output 1 | |||
| Response *3 | 63％ response Dampling time: 2s (Standard) Settable in steps of 1s from 1~99s upon delivery | |||
| Cable | Cable length: Approx. 500mm 4 core AWG28 Outer diameter: φ2.8 with a shield | |||
| LED Display | One LED display in the main body Green: Flow rate display in 3-step speed Red: NG status is displayed with number of blinks |
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| Installation Position | Free (Air intrusion shall be avoided.) | |||
| Piping Connection | R1/4 | R1/2 | R1 | |
| Protection Level | Indoor use (Equivalent to IP65.) | |||
| Power Supply *5 | 12～24V DC±10% | |||
| Consumption Current | 100mA DC or less | |||
| Weight | Approx. 190 g | Approx. 190 g | Approx. 290 g | |
| Wetted Materials | Body Case | PPS | ||
| Electrode | SUS316L | |||
| Earth Ring | SUS316 | |||
| O-Ring | FKM | |||
*1：Accuracy is the guaranteed value of average value accumulated for 240s.
*2 indicates the frequency at the maximum guaranteed flow rate.
*3 For the set value and choice of Output 1 and Output 2, all are factory settings. The setting cannot be changed after installation.
*4：Alarm is selectable only for either of Output 1 or Output 2.
*5 Using isolated power supply and connecting one power supply device per VN flow sensor are recommended
Download Datasheet: Kofloc VN Electromagnetic Flow Meter
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