High-pressure high-temperature thermal flow switch

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Our company offers thermal flow switches, available in high-pressure versions up to 25 MPa and high-temperature versions capable of withstanding temperatures of 280 degrees, as well as models with dual alarm points for upper and lower limits. The SHLK series of thermal flow switches are based on the thermal principle. The enclosed probe contains two resistors: one of them is heated and serves as the sensing resistor, while the other remains unheated and functions as the reference resistor. As the medium flows, the heat from the heated resistor is carried away, causing a change in its resistance value. The difference between the values of these two resistors is used as a basis for determining the flow rate. The SHLK series of thermal flow switches feature a compact design, no moving parts, are maintenance-free and easy to install. One model can meet various pipe diameter requirements, the switch signal can be adjusted continuously, and there is extremely low pressure loss. Options include high-temperature, high-pressure, explosion-proof, and dual-contact (upper and lower limit alarm) types of flow switches. The SHLK series of thermal flow switches are designed for use with both gases and liquids; they can be applied in pneumatic and hydraulic systems. They are suitable for monitoring the interruption of flow in gases, flare gas, circulating water, heating systems, cutting fluids, and lubricants, as well as for providing protection against pump idling. □ Key technical specifications
Item: Standard type, High-temperature type, High-pressure type, Simple type
外形: Medium temperature range –40～80℃, –40～280℃, –40～80℃, –40～80℃
Nominal pressure: ≤5MPa, ≤5MPa, ≤25MPa, ≤10 MPa
Fixing method: G20 pipe thread, G20 pipe welding, G20 pipe welding, G20 pipe thread
Explosion protection rating: ExdIIBT6, ExdIIBT6, ExdIIBT6
Response time: ≤5s, ≤9s, ≤9s, ≤5s
Stability time after power-on: ≤3 minutes
Flow rate: Gas: 0～30m/s; Liquid: 0～5Mm/s
Power supply: DC24V/80mA. Contact capacity: AC220V/1A, DC24V/2.5A
Protection rating: IP65
Connection cable: RVV4×1.0
Connection distance: 1500m
Environmental requirements: Ambient temperature: –40～65℃; Relative humidity: 5%～95%; Atmospheric pressure: 86～106KPa
□ Installation notes
﹡ It can be installed on horizontal, vertical, or inclined pipelines. The length of the straight pipe section should be at least 3D upstream and 2D downstream. (D is the nominal diameter of the pipe) ﹡ For pipes with a diameter of ≥DN150, the length of the fixing splice G20 can be chosen to be 2–3 cm; one end is welded to the pipe, while the other end is used to fix the flow switch. For pipelines ≤DN150, the length of the fixed shorting G20 should be increased to position the sensor of the flow switch as close as possible to the center of the pipeline. ﹡ Use a wrench to rotate the stainless steel hexahedron during installation; under no circumstances apply force to the aluminum casing. After debugging, tighten the upper cover and lock the locking screw of the upper cover. ﹡ Four-wire wiring method, where 24V is connected to the positive power supply terminal, 0V to the negative power supply terminal; CON is an open-contact output, while COFF is a closed-contact output.