DL-SC-701 series RF admittance level switch

DL-SC-701 seriesRF admittance level switchIt is a replacement product for capacitive level switches, which solves the problem of material adhesion and has system stability compared to other similar products.

The DL-SC-701 series is a universal point control instrument. The product is used for limit control and alarm, and the instrument is widely used in industrial and civilian fields, suitable for most application scenarios. The instrument consists of a circuit unit, an explosion-proof casing, and pole or cable type sensing elements, with multiple models of sensors available for selection. The instrument can be installed as a whole or separately.
The DL-SC-701 series RF admittance level switch is a replacement product for capacitive level switches, which solves the problem of material adhesion and has higher system stability compared to other similar products. Even under harsh on-site conditions, it can work reliably without being affected by hanging materials, temperature, pressure, material density, humidity, or even changes in material chemical properties. 220VAC or 24VDC power supply. It has been widely applied due to its reliable performance, easy installation, and low cost.

Working principle of RF admittance level switch:

Radio frequency admittance is a new level control technology developed from capacitive technology, which is anti hanging, more reliable, accurate, and widely applicable. It is an upgrade of capacitive level technology. The so-called radio frequency admittance refers to the reciprocal of impedance in electricity, which is composed of resistive, capacitive, and inductive components. Radio frequency refers to the spectrum of high-frequency radio waves, so radio frequency admittance can be understood as measuring admittance using high-frequency radio waves. When the instrument is working, the sensor of the instrument forms an admittance value with the tank wall and the measured medium. When the level changes, the admittance value changes accordingly. The circuit unit converts the measured admittance value into a level signal output to achieve level measurement.

The important difference between RF admittance level switch and capacitive technology lies in the diversity of measurement quantities and anti hanging material technology.

The diversity of measurement quantities for RF admittance level switches lies not only in measuring capacitance, but also in measuring the comprehensive quantity of capacitance, resistance, and inductance, making the measurement more comprehensive and accurate.

Anti hanging material technology involves adding a shielding electrode between the measuring electrode and the electrode to protect the measuring electrode from hanging materials. A wire is drawn out from the measurement signal of the circuit unit, amplified by a in-phase amplifier, and its output is connected to the shielding layer of the coaxial cable, and then connected to the shielding layer of the probe. This amplifier is a in-phase amplifier with a gain of "1". The output signal is at the same potential, phase, and frequency as the input signal, but isolated from each other. The ground wire is another independent conductor in the cable. Due to the above-mentioned relationship between the centerline and outer shielding of coaxial cables, there is no potential difference between the two, so no current flows through, that is, no current leaks out from the centerline, which is equivalent to no capacitance or capacitance equal to zero between the two. Therefore, the temperature effect of the cable and the installation of capacitors will not have any impact.

RF admittance level switch product features:

Strong universality: capable of measuring liquid and material levels, meeting the measurement requirements of different temperatures, pressures, and media

The temperature can reach 800 ℃, the high pressure can reach 5Mpa, and it can be applied to harsh environments such as corrosion and impact.

Anti hanging material: The unique circuit design and sensor structure enable its measurement to be unaffected by sensor hanging material, without the need for calibration

Regular cleaning to avoid measurement errors.

Maintenance free: There are no movable parts during the measurement process, and there is no mechanical component damage issue, so no maintenance is required.

Anti interference: contact measurement, strong anti-interference ability, can overcome the influence of steam, foam and agitation on measurement.

Accurate and reliable: Diversified measurement quantities make measurements more accurate, measurement is not affected by environmental changes, high stability, and

Long service life.

Typical applications of RF admittance level switch:

Conductive and insulating liquids - chemical, oilfield, water and sewage treatment

Conductive and insulating liquids - papermaking, pharmaceuticals, water and wastewater treatment

Powder: ash, powder - power plants, metallurgy, cement

Particles: coal, grain - power plants, metallurgy, grain

Performance indicators:

Power supply: 220VAC ± 50VAC 50/60HZ (standard)

110VAC ± 25VAC 50/60HZ (standard)

24VAC ± 5VAC (optional)

Output: DPDT relay (double pole double throw)

Output capacity: 220VAC 5A

Environmental temperature: -40 ℃~70 ℃

Medium temperature: -100 ℃ to 800 ℃

Resolution:<0.5PF

Repeatability:<1mm (conductive medium)

<10mm (insulation medium)

Response time:<0.5s

Delay: 1-50s

High and low level alarms: can be set as HLFS (high level alarm) or LLFS (low level alarm) on site

Spark protection (for sensors): Built in spark protection circuit

Electrical interface: M20 * 1.5

Cable: The standard connection cable between the split electronic unit and the sensor is 5m and 50m long

Process connection: NPT thread installation (standard)

Flange installation (optional)

Shell protection: IP66

Explosion proof: Exd [ia] iallct4

Related products: Resistance rotary level switch