SI-33EX thermal conductivity flow switch is explosion-proof, ExdII CT6. It can monitor the flow of liquid in the pipeline in real time. One model is suitable for multiple pipe diameter requirements and provides switch output. It uses 6 LEDs to display the fluid flow rate status in real time.
Sino-Inst supports customization of installation thread, probe length, probe material, etc.
Features
- SI-33EX series thermal conductivity flow switch can monitor the flow of liquid in the pipeline in real time.
- No moving parts, maintenance-free, easy to install.
- Provide switch output.
- Use 6 LEDs to display the flow rate of fluid in real time. Realize the following monitoring functions: medium flow, reduce/increase flow rate; medium presence/absence; medium flow/stationary; monitor the flow rate of fluid in the pipeline, flow interruption monitoring or prevent the pump from running dry.
- The unique conical probe design can effectively prevent the entanglement of winding objects in the medium.
- Fully waterproof shell design. Unique waterproof adjustment knob. It can be adjusted arbitrarily without removing the sealing screw, which is convenient and reliable.
- Applicable to a wide range of pipe diameters, and the set point can be adjusted at will.
- Optional anti-corrosion type.
- The maximum pressure resistance is up to 100Bar.
- Optional relay, analog output or analog switch integrated output.
SI-33EX Thermal Conductivity Flow Switch Technical Parameters
| Setting range | Water—1…150cm/s, Oil—3…300cm/s, Air—20…2000cm/s |
| Measurement medium | Water, oil, gas and other media compatible with stainless steel |
| Output type | PNP/NPN/Relay, /NO/NC can be set 4-20mA |
| Power supply | 24V±20%DC |
| Power on | Maximum 400mA (PNP or NPN type); Maximum 3A 24VAC/DC (relay type) |
| No-load current | Maximum 80mA |
| Flow indication | LED row (6 pieces), or Digital display |
| Setting method | Key setting |
| Withstand voltage range | 100bar (maximum customizable 40MPa) |
| Medium temperature change | ≤4℃/s |
| Response time | 1~13s, typical value 2s |
| Initialization time | About 8s |
| Electrical protection | Reverse phase, short circuit, overload protection |
| Explosion-proof grade | ExdⅡCT6 Gb |
| Protection grade | IP67 |
| Medium temperature | -20…100°C (customizable -60~150℃) |
| Ambient temperature | -20….80℃ |
| Storage temperature | -20…100°C |
| Wiring method | Terminal connection M20*1.5 |
| Material | Probe: stainless steel (customizable 316L/titanium alloy/PTFE material); Housing: cast aluminum |
| Repeat accuracy | ±2% |
Button Setting Instructions
| Menu name | Function introduction | Parameter selection range |
| SP1 | Switch 1 action value | 2%~100%FS |
| hs1 | Switch 1 reset value | 0%~98%FS |
| oUt1 | Switch 1 output type | no/nc |
| SP2 | Switch 2 action value | 2%~100%FS |
| hs2 | Switch 2 reset value | 0%~98%FS |
| oUt2 | Switch 2 output type | no/nc |
| FAC | Display value coefficient | 0.1~99.9 |
| CAL | Calibration parameter | 0~9999 |
| END | Exit menu | – |
Wiring
Working Principle of Explosion-proof Thermal Conductivity Flow Switch
The explosion-proof thermal conductivity flow switch is based on the thermal principle. Two resistors are contained in the closed probe, one of which 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.
The probe adopts anti-scaling coating, which can effectively prevent the adhesion of scale, rust and other dirt in the pipeline. It has stronger anti-fouling ability and more stable operation.
More Flow Switches
Explosion-proof Thermal Conductivity Flow Switch is suitable for flow monitoring of different media, including some impure liquid and gas media. Many product advantages have been fully utilized in industrial electric furnaces, welding equipment, laser equipment, microwave equipment, glass machinery, lubrication machinery, printing machinery, machine tools, and large transformers.
Sino-Inst provides customization of explosion-proof flow switches. Including probe length, output signal, liquid contact material, pressure resistance level, etc. If you need to purchase explosion-proof flow switches, please feel free to contact us!