1、 Product Description:

HJ-MLSS-B type photoelectric typeSludge concentration meterIt is an online analytical instrument designed to measure the concentration of suspended solids in municipal or industrial wastewater treatment processes. Whether evaluating activated sludge and the entire biological treatment process, analyzing wastewater discharged after purification treatment, or detecting sludge concentration at different stages, HJ-MLSS-B photoelectric methodSludge concentration meterCan provide continuous and accurate measurement results.
HJ-MLSS-B type photoelectric typeSludge concentration meterComposed of transmitters and sensors. Sensors can be conveniently installed in pools, drainage pipes, pressure pipelines, or natural water bodies. HJ-MLSS-B photoelectric typeSludge concentration meterCan automatically compensate for interference caused by pollution. The bidirectional digital communication between the transmitter and the sensor can prevent signal attenuation and allow the sensor to be far away from the transmitter. The sensor is equipped with an air cleaning function, which can automatically clean at a pre-set time, greatly reducing the workload of instrument maintenance.
2、 Application areas:
Water supply plant - sedimentation tank;
Paper mill - pulp concentration;
Coal washing plant - sedimentation tank;
Power plant - mortar sedimentation tank;
Sewage treatment plant - inlet, outlet, aeration tank, return sludge, primary sedimentation tank, concentration tank, sludge dewatering, etc.
3、 Measurement principle:

HJ-MLSS-B type photoelectric typeSludge concentration meterThe attenuation of infrared light transmission and scattering in sludge and suspended solids is based on the concentration of suspended solids in the liquid. The infrared light emitted by the transmitter on the sensor, after being absorbed, reflected, and scattered by the measured object during transmission, only a small portion of the light can reach the detector. The transmittance of the transmitted light is related to the concentration of the measured wastewater, so the concentration of the wastewater can be calculated by measuring the transmittance of the transmitted light.

Figure 4 Beam Principle Diagram

HJ-MLSS-B type photoelectric typeSludge concentration meterThe sensor uses four beam technology, as shown in the diagram. Using four beam technology, two emitters and two detectors are used. The light emitted by each emitter is transmitted and directed onto the two detectors, creating a series of optical paths and obtaining a data matrix. By analyzing these data signals, the accurate concentration of suspended solids in the medium can be obtained, and interference can be effectively eliminated to compensate for deviations caused by pollution, enabling the instrument to operate in harsh environments.
Note: The infrared receiver uses an integrated circuit chip that converts high-precision 940nm light intensity into frequency, converting the received light intensity into a digital signal.
4、 Technical parameters:
1. Host parameters:
Measurement range: 0-9999mg/L; 0～50g/L； 0-500g/L (customizable)
Accuracy: ± 1% FS
Resolution: 0.01g/L or 1mg/L
Repeatability: ± 1%
Flow velocity range: 0.3-3 m/s
Power: 15 VA;
Power supply: AC220V，50/60 Hz； DC24V (optional)
Temperature range:- 20℃～55℃
Output: 1-channel 4-20mA current signal isolated output, maximum load 750 ohms;
2 alarm signal relays, capacity 220VAC/2A, output can be set by the user;
1 flushing time relay, capacity 220VAC/2A, time can be set by the user.
There are two measurement units to choose from: g/L and mg/L.
Shell: ABS/PVC engineering plastic
Protection level: IP65
Weight: 1.5 kg
Sensor parameters:
Temperature range: 0 ℃~80 ℃
Pressure: ≤ 10 bar
Material: 316 stainless steel, ABS, K9 optical glass
Protection level: IP68
Cable length: 10m (maximum length 50 meters)
Weight: 1.2 kg
5、 Product features:
Multi beam mutual compensation technology eliminates measurement errors caused by window contamination;
● Air self-cleaning function, basically maintenance free; (The user can choose an air blowing device with a pressure of 0.7-3.4 Bar, which is connected to the sensor interface through a 1/4 'polypropylene tube. The user should provide their own solenoid valve.)
● Automatic conversion of measurement methods to adapt to a large range of measurement;
Digital sensors integrate signal processing into the sensors, greatly improving the reliability and stability of measurements;
Optical bandpass filtering and modulation of excitation light effectively avoid the influence of ambient light on measurement.