How to deal with the zero drift of the thermal gas mass flowmeter?
2024-04-15
Zero drift refers to when the input signal of the amplifier circuit is zero (that is, there is no AC input), due to the influence of factors such as temperature change, power supply voltage instability, so that the static operating point changes, and is amplified and transmitted step by step, resulting in the circuit output voltage deviation from the original fixed value and the phenomenon of floating up and down it is also referred to as: zero drift.
When the hot gas mass flow controller and the hot gas mass flow meter are used, there will be a situation of zero drift. The cable provided by Laifeng Technology can be used to connect the gas mass flow controller with the display instrument or other secondary instruments during zero calibration. After fully preheating for 15 minutes, observe whether the zero is returned to zero. If it is not returned to zero, it can be zeroed by adjusting the gas mass flow controller and the zeroing potentiometer of the mass flow meter (on the side of the MFC air inlet). Digital gas mass flow controllers and mass flowmeters can be zeroed by software.
The thermal gas mass flow controller and thermal flowmeter sensor consist of two sensing elements, a speed sensor and a temperature sensor. They automatically compensate and correct for changes in gas temperature. The electric heating part of the instrument heats the speed sensor to a certain value above the operating temperature, so that a constant temperature difference is formed between the speed sensor and the sensor measuring the operating temperature. When the temperature difference is kept constant, the energy consumed by electric heating, which can also be said to be the heat dissipation value, is proportional to the mass flow of the gas flowing through it, which is suitable for the measurement of a single gas and a fixed proportion of multi-component gases.
For the specific selection of thermal mass flow meter, you can consult Aister, E-mail :sales@aistermeter.com
When the hot gas mass flow controller and the hot gas mass flow meter are used, there will be a situation of zero drift. The cable provided by Laifeng Technology can be used to connect the gas mass flow controller with the display instrument or other secondary instruments during zero calibration. After fully preheating for 15 minutes, observe whether the zero is returned to zero. If it is not returned to zero, it can be zeroed by adjusting the gas mass flow controller and the zeroing potentiometer of the mass flow meter (on the side of the MFC air inlet). Digital gas mass flow controllers and mass flowmeters can be zeroed by software.
The thermal gas mass flow controller and thermal flowmeter sensor consist of two sensing elements, a speed sensor and a temperature sensor. They automatically compensate and correct for changes in gas temperature. The electric heating part of the instrument heats the speed sensor to a certain value above the operating temperature, so that a constant temperature difference is formed between the speed sensor and the sensor measuring the operating temperature. When the temperature difference is kept constant, the energy consumed by electric heating, which can also be said to be the heat dissipation value, is proportional to the mass flow of the gas flowing through it, which is suitable for the measurement of a single gas and a fixed proportion of multi-component gases.
For the specific selection of thermal mass flow meter, you can consult Aister, E-mail :sales@aistermeter.com
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