Dust detector

SJC100Dust detectorThe photoelectric sensing principle is used to detect dust concentration, and the sensing probe adopts an open structure, which can effectively prevent dust pollution and can work online for a long time. The detector has functions of frequency signal output, power-off switch signal output, current signal output, and RS485 signal output, and can be used in conjunction with monitoring systems and other controllers.

Product Features

The voltage adaptation range is 9-24V.

Ultra low power consumption, non alarm operating current<35mA, maximum alarm current<50mA (power supply voltage 18V, data measured using frequency output model).

Long distance signal transmission, transmission distance>3000 meters under 18V power supply (frequency signal).

Without fans or enclosed chambers, it can effectively prevent dust pollution and eliminate the tedious maintenance work of regular cleaning and dust removal.

It has sound and light alarm function and power-off output function.

Ultra high brightness display screen, clear and eye-catching fonts, wide viewing angle range.

Environmental conditions for use

Environmental temperature: -20 ℃ to+65 ℃;

Average relative humidity: not exceeding 95% (+25 ℃);

Atmospheric pressure: 80kPa~106kPa;

In situations where there is no significant vibration or impact.

Explosion proof type: intrinsic safety type. Explosion proof mark: Ex ia I Ma.

working principle

SJC100Dust detectorComposed of photoelectric sensing probe, signal processing circuit, main controller, power conditioning circuit, signal output circuit, etc. The photoelectric sensor can sense the amount of dust particles contained in the air, and convert it into a voltage signal through a modulation circuit, which is then sent to the signal conditioning circuit. The signal conditioning circuit shapes, filters, amplifies, and converts weak voltage signals into analog-to-digital signals before sending them to the main controller for processing. It calculates the mass of dust per unit volume, which is the dust concentration, and then displays it on a high brightness display screen. The main controller not only drives the display screen to display dust concentration, but also outputs frequency signals, current signals, RS485 signals, and power-off signals. After being driven by the signal output circuit, they are supplied to the subsequent monitoring system or controller for collection.

technical indicators

The working voltage is between 9 and 24V.

The working current is less than 50mA/18V DC.

Measurement range: 0-1000mg/m3 (other ranges can be customized).

The basic error is ± 15%.

5 output formats

(1) Frequency output type: Frequency: 200-1000Hz, pulse width greater than 0.3ms.

(2) Current output type: 4-20mA.

(3) RS485 output type: MODBUS-RTU communication protocol.

Note: Choose one of the above output formats when ordering, and the product will be set according to the requirements before leaving the factory.

6 transmission distance

(1) The power supply voltage is 18V, and the frequency output type is selected. When using cables with the following parameters, the transmission distance is ≥ 3000m. Cable parameters: R ≤ 12.5 Ω/km, L: 0.8mH/km, C: 0.06 µ F/km.

(2) The transmission distance of current output type and digital signal output type shall comply with relevant specifications.