Radio frequency admittance level switch fast calibration method
Radio frequency admittance level switch is widely used in petroleum, chemical, metallurgy, electric power, medicine, food, paper, building materials and other industrial fields. The product uses high-frequency technology to generate a low-power RF signal from the electronic circuit to the probe. The probe acts as a sensitive element and feeds back the signal change caused by the permittivity of the level to the electronic circuit. Because these changes include the capacity and conductance. The change, and thus the electronic circuit processing is a comprehensive change signal of capacitive impedance and impedance; change the output state of the relay after processing. It is based on the original capacitance measurement to improve the radio frequency admittance measurement technology and represents a new level of today's level measurement.
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Radio frequency admittance level switch fast calibration method:
1. Connect the probe and header in the correct way and connect the power supply. Pay attention to the correct power supply voltage. Warm up for 3 minutes.
2. The adjustable range of 3 potentiometers on the instrument panel is in the range of 8 o'clock to 4 o'clock. It can not rotate 360 ​​degrees, otherwise it will damage the potentiometer. The green light represents the normal state, and the red light represents the alarm state.
3, potentiometer F - on behalf of fine tuning (referred to as F): potentiometer C - on behalf of coarse adjustment (referred to as C); potentiometer DLY - represents the delay output (referred to as DLY): delay time 0-30 seconds), can Set or close arbitrarily.
4. In general, place the FALLSAFE insert on the L position and close the delay (counterclockwise rotation).
5. Place F on the l2 o'clock position, adjust C, and hit the critical point at the 10 --- 2 o'clock position (turn green clockwise first to red light, then counterclockwise red light to the green light ) This location is called the supervision point. If the red light is already on after power on, then adjust C counterclockwise, and when the red light turns green, it is the critical point.
6. Adjust F again clockwise to find a more precise tipping point. The green status should be displayed.
7. (a) If it is applied to a dust system, F may be rotated about 20 degrees counterclockwise from the critical point.
(b) If it is applied to a coal conveying system, then C may be rotated about 10 degrees clockwise from the critical point.