SI-100B electronic flow switch-sensor is suitable for various pipe diameter requirements. PNP, NPN, PNP +4-20mA analog output is optional. The switch quantity is continuously adjustable. LED displays flow trend and switch status.
Gas-liquid dual-purpose type. It can be used in pneumatic and hydraulic systems, and can be used for the flow interruption detection of circulating water, cutting fluid and lubricating oil, as well as the idling protection of pumps.
Electronic Flow Switch-Sensor Structure & Principle
Based on the thermal principle, two resistors are contained in the closed probe. One is heated as the detection resistor, and the other is not heated as the reference resistor. When the medium flows, the heat on the heating resistor is taken away. The resistance value is changed. The difference between the two resistors is used as the basis for judging the flow rate.
SI-100B Electronic Flow Switch-Sensor Technical Parameters
| Setting range: | 1…300cm/s (water) 3…300cm/s (oil) 20…2000 cm/s (air) Specific needs to be factory calibrated or customized on site. |
| Switch output: | Setting range: 0.5%…100% range |
| Number of switches: | 1 |
| Electrical design: | PNP, NPN, PNP +4-20mA optional |
| Output function: | Normally open/normally closed; (parameters can be set) |
| Analog output: | Output type: 4…20mA analog output |
| Load: | ≤500Ω |
| Current load: | ≤300mA |
| Switch point accuracy: | ±2-±10cm/s |
| Flow indication: | LED lights (10 3 colors) |
| Setting method: | Button setting |
| Pressure range: | 100bar |
| Medium temperature change: | 4°C/s |
| Response time: | 1…13s, typical 2s |
| Initialization time | About 8s |
| Power supply: | 24±20%VDC |
| Power on: | Maximum 400mA (PNP or NPN type) Maximum 2A48VAC/DC (relay type) |
| Electrical protection: | Reverse phase, short circuit, overload protection |
| Protection level: | IP67 |
| Medium temperature: | -20…80°C |
| Ambient temperature: | -20…80°C |
| Storage temperature: | -20…100°C |
| Wiring method: | M12 connector/directly attached 2m cable optional |
| Material: | Housing: 304 stainless steel; Probe: 304 stainless steel |
| Weight: | About 0.4kg |
| Repeat accuracy: | 1…5cm/s |
Display panel settings
- Press S1 button or S2 button once to make the red light flash
- Press S1 or S2 again to move the switch point
- Press S2 to set the maximum flow rate
- Press S1 to set the minimum flow rate
SI-100B Electronic Flow Switch-Sensor wiring diagram
Application Case 1: Petrochemical Industry
In the petrochemical industry, flow monitoring is essential to ensure the stability and safety of the production process.
A large petrochemical enterprise uses Sino-Inst’s thermal conductivity flow switch to monitor key fluids in the production process in real time. Through accurate flow data, the company successfully achieved optimized control of the production process and improved production efficiency and product quality.
Application Case 2: Water Treatment Field
In the field of water treatment, thermal conductivity flow switches also play an important role. A sewage treatment plant uses this switch to monitor the flow of the water inlet and outlet in real time.
Through accurate flow data, the sewage treatment plant can accurately control the parameters of the treatment process to ensure that the effluent water quality meets the discharge standards. At the same time, the switch also helps the sewage treatment plant achieve the goal of energy saving and consumption reduction, and improves the overall operational efficiency.
SI-100B electronic flow switch has no moving parts, is maintenance-free and easy to install. One model is suitable for various pipe diameters.
Sino-Inst supplies various types of flow switches and flow meters. Explosion-proof, thermal conductivity, electronic, mechanical, etc. If you need to purchase a flow switch, or have related technical questions, please feel free to contact us.