A:Corrosive gases can be sealed with suitable materials. The maximum temperature should not exceed 50℃. High-humidity gases are not suitable. Condensation caused by high humidity can clog the sensor and prevent the product from working properly.
A:The product can only be used to measure or regulate flow rate, but cannot detect pressure or temperature.
A:It is recommended to preheat for a certain period of time to ensure accuracy. It won’t damage the product when powered on and used directly, but the gas flow rate that comes out at the beginning may not be very accurate.
A:The product sensor adopts the capillary heat transfer temperature difference calorimetry method and belongs to the thermal mass flowmeter/controller.
A:At present, the communication interface of the product is RS485, and the standard Modbus-RTU protocol is used.
A:It is recommended to use shielded wires for the connection. 2: Stay away from interference sources. 3: Grounding treatment. 4: The product’s exterior is shielded.
A:There are two ways to switch modes. 1: Remote modification via the 485 communication protocol. 2: Make the change by pressing the potentiometer on the side of the product.
A:It will not be damaged within the product’s pressure resistance range. If the range is exceeded too much, a fixed value will be displayed, which is not the actual flow rate.
A:Digital MFC/MFM models are equipped with a cumulative function, allowing the cumulative flow value to be directly read via 485. Analog ones can only perform cumulative performance based on feedback signals (0-5V/4-20mA).
A:There is no one-way function. To prevent backflow, it is recommended to install a one-way valve at the product’s air outlet.
A:Thermal flow and laminar flow have different application fields. The advantages of thermal flow are high pressure resistance, corrosion resistance, and high cost performance. The disadvantages are that the reaction speed is a bit slower because there is a heat conduction process. The gas source must be high-purity gas. It is afraid of water, oil stains, and impurities. Chip flow also belongs to thermal flow. It cannot withstand high pressure and cannot pass corrosive gases.
A:If the storage time is too long, it is recommended to return it to the factory for re-inspection to ensure that the sealing parts are in normal condition and free of leakage.
A:The solenoid valve of the product is a regulating valve, not a stop valve, and cannot be used as a stop valve. Users should provide a separate stop valve. Especially if users are using corrosive gases, a stop valve should usually be added to the air inlet of the mass flow controller and a check valve to the air outlet to ensure work safety. After long-term operation, if the leakage rate of the controller valve port is within 2%F.S, it is considered a normal situation. If the air leakage exceeds 2% of the full scale, maintenance should be carried out.
A:The product design standard is 10MPA. Exceeding it may cause damage to the valve.
A:The material in contact with the gas, except for the sealing parts, is all stainless steel. The sensor is also indirect type and is suitable for the vast majority of corrosive gases.
