RF admittance level controller

RF admittance level controllerworking principle

The level controller uses phase shift detection technology to detect the presence or absence of material level in the tested silo. The quartz electronic oscillator in the controller electronic circuit generates a fixed frequency high-frequency sine wave signal within the radio transmission spectrum range. The high-frequency oscillation signal is divided into two paths, one path is directly sent to the detection electrode, and the other path is sent to the anti adhesion protection electrode after passing through a voltage follower. The phase detector compares the detection signal of the feedback self detecting rod with the basic signal in phase. Due to the difference in dielectric constant and conductivity of any tested material compared to air, when the detection rod comes into contact with the material, the reactance (including capacitance and impedance) of the detection signal will change, and the change in reactance will cause a change in the phase of the detection signal on the detection rod; Therefore, the phase difference between the detection signal and the reference signal also changes accordingly. After processing the change in phase difference, the output circuit is driven to issue an alarm signal. Since the reciprocal of reactance is admittance and the frequency of the detection signal is within the radio transmission spectrum, we refer to this type of level controller asRF admittance level controllerRF is the English transliteration of radio frequencies“Radio Frequency”The abbreviation.

feature

The two-step calibration and online testing functions of the level controller series will save you a lot of time and money. High quality wave soldering solid-state electronic circuits and probes with anti adhesion protective electrodes formed by high-voltage injection molding are the manufacturing characteristics of RF series level controllers, which make the controllers more reliable.

Online testing function

The online testing process is completed through a Test button, which greatly reduces various risks caused by material spillage and the release of toxic and harmful materialsNecessary trouble. The adoption of this advanced technology allows you to safely perform online simulation testing on the RF level controller installed on the silo in hazardous situations without disassembling the instrument.

High quality structure

All standard casings are made of aluminum alloy hard molds and coated with polyester paint on the surface. RF series probes are suitable for working environments ranging from -60 ℃ to+260 ℃

Environment, safe, sturdy, and reliable. The electronic circuit of the instrument adopts double-sided printed circuit board and is soldered with wave soldering. Each instrument undergoes strict testing before leaving the factory.

Other features of the RF series

Two year warranty period

Suitable for detecting various occasions such as particles, fly ash, conductive (non-conductive) liquids, viscous materials, etc

DIP sensitivity adjustment switch and delay time setting switch

The probe can be directly extended on-site

Separable instruments suitable for high temperature and vibration environments

Probe Introduction

There are probe series made of various materials that can meet the needs of most detection processes. Polyphenylene sulfide plastic (Ryton) and 316 stainless steel are commonly used materials. Ryton is a durable engineering plastic with strong corrosion resistance. If Ryton and stainless steel still cannot meet the measurement requirements, a probe with a Kynar sheath can be used.

When the RF probe is installed on the top of the storage tank, the end can be extended up to 1.5 meters. If longer is required, a pipe can be used to extend the root. The rope type probe of the RF8000 series can reach a length of 13.5 meters.

Probe accessories

Some of these accessories are installed on the probe to improve sensitivity and adapt to detecting low dielectric constant materials; Some can be installed on the probe to increase its length, and can be used when the probe is not long enough.