Digital On-Line Moisture Analyzer

Principle of online near-infrared moisture monitoring system

Infrared light absorption principle Molecular structures inside substances, such as oxygen-hydrogen bonds in water and carbon-hydrogen bonds in organic matter, absorb near-infrared light of specific wavelengths. At a particular wavelength, the reflected NIR energy is inversely proportional to the number of NIR absorbing molecules it contains. The moisture meter analyzes the change of near-infrared energy at a specific wavelength based on the principle that near-infrared wavelengths are absorbed by water molecules. Water molecules are not static: they vibrate when they encounter specific energy bands. The bonds between two hydrogenatoms and oxygen atoms in a water molecule stretch, shrink, or otherwise twist. External energy is required to cause these vibrations, and the energy required spans specific bands of the entire electromagnetic spectrum. In different parts of the entire spectrum, some absorption bands are very strong and some are very weak. In the near-infrared part of the spectrum, this part of the band is particularly strong for water molecules, and it is easier for instruments to emit, filter and receive this energy. Use specific wavelengths of near-infrared light energy to provide the right amount of energy to the moisture in the product under test. The wavelength generally used to measure moisture is kept in the range of 1 to 2.5 microns.

How much energy at a particular wavelength is absorbed depends on how many water molecules the near-infrared energy beam encounters and the strength of the absorption at that particular wavelength. The number of water molecules encountered by the energy beam is proportional to the amount of water in the measured substance. At the same time, because the moisture meter is in the form of reflectance, the measured light beam is also affected by the reflection and absorption characteristics of the measured substance. Near infrared moisture measurement technology is a non-destructive, non-contact real-time moisture detection technology.

Working principle of online near-infrared moisture monitoring system

The infrared online moisture analyzer gathers the near-infrared beams of multiple wavelengths on the surface of the measured object, and the near-infrared beams reflected by the surface are received and processed by an advanced infrared optical detection system. This advanced infrared optical detection system can process data quickly. An embedded super-performance miniature digital signal processing chip is used to process, store and display the required data. Its accuracy and stability are outstanding. The phenomenon utilized by the online infrared moisture analyzer is that many substances absorb infrared energy at certain wavelengths, but do not absorb infrared energy at other wavelengths. When measuring the water content of the substance under test, select at least two wavelengths. One is a reference

wavelength that is not strongly absorbed by the substance or water under test. The other is for measuring wavelengths, which are not strongly absorbed by the substance under test, but are strongly absorbed by water. In-line infrared moisture meters use precision infrared filters mounted on the rotor. This setup allows pulses of reference and measurement light to pass through the filter alternately. The retained beam is focused on the sample under test. First the reference light is projected on the sample and then the measurement light is projected on the sample. The two timed pulses of light energy are reflected back to a detector, which in turn is converted into two electrical signals. The reference channel indicates how much energy is expected to be reflected. The measurement channel is partially absorbed by water molecules, so its energy will decay. The two signals combine to form a ratio. The difference between this ratio and some other ratios obtained from samples with different moisture levels is proportional to the difference in moisture content between the two.

The signal strengths of the two channels are combined into the following

equation: R/M X M1/R1 = ratio

Among them: R--represents the reference channel of the product beam

M--represents the measurement channel of the product beam

M1--represents the measurement channel of the compensation beam

R1--Represents the reference channel of the compensation beam

If a drift condition occurs, such as a change in the intensity of the light at the measurement wavelength, the M and M1 values are affected proportionally at the same time. For ratios, the result of the drift is canceled out, maintaining the stability and consistency of the measurement results.

Online NIR Moisture Monitoring System

The ZHIYI-50ZS online near-infrared moisture monitoring system can be used in all industries that need to quickly measure moisture, and perform online real-time monitoring of the moisture content of various raw materials. The instrument integrates the mature technology in the field of moisture measurement, which makes the whole analysis system more perfect. It adopts the principle of near-infrared detection, and the detection results are stable and reliable.

Wide range of applications

The instrument can monitor the moisture content of various materials online in real time, and is widely used in daily chemicals, tobacco, paper, wood, steel, grain, coal, food, textile, building materials, pharmaceuticals, feed, chemicals, petroleum, ceramics, glass, For military, metal, new energy and other industries, please refer to the "Table 1 Application Table of ZHIYI-50ZS Online Near Infrared Moisture Monitoring System" in this catalog for application details.

Target material non-destructive testing

The instrument adopts a high-tech technology of non-contact online monitoring - near-infrared spectral detection technology. Near-infrared light has strong penetrating ability. When testing samples, it does not need any pretreatment, and can penetrate glass and Plastic, to achieve non-destructive testing of target materials.

Zero pollution, fast detection

The test process of ZHIYI-50ZS does not require any chemical reagents. Compared with conventional analysis methods, it will not pollute the environment and save a lot of reagent costs. Near-infrared spectroscopy detection technology is fast, and the test can be completed within a few seconds.

Simple to calibrate

ZHIYI-50ZS has been calibrated by a special moisture curve before leaving the factory. Users only need to calibrate the translation and slope. The calibration is fast and simple.

Eliminate distractions

The instrument has the function of automatic temperature compensation, which is basically not affected by changes in external temperature. The probe does not need a hood and is not affected by changes in external ambient light. Brushless DC motor, the speed is as high as 6000-8000 rpm, which effectively improves the detection speed and increases the comprehensive anti-interference ability

Stable and secure system

Embedded miniature digital signal processing chip,stable operation, accurate calculation and high processing efficiency. Using aviation plug, the wiring method is fast and easy to operate, with good anti-interference performance, anti-static and good stability.

signal processing

The instrument supports 4-20mA, RS232/RS485 and other output interfaces, which is convenient for users to establish equipment network for production and data management.

Technical parameter

Product number	ZHIYI-50ZS
Measuring range	1-50%（Material without water seepage）
display resolution	0.01%
Display method	5-digit digital tube display
measurement accuracy	±0.1--±0.5%（Different material textures have an impact）
Measurement channel	10
Height range	250mm±100mm
Ambient temperature	-30-60℃With automatic temperature compensation, it is basically not affected by changes in external temperature
Environment humidity	5-90%
Repeatability	≤0.1%
Response time	0.1-60 seconds adjustable
Filter range	0-2.5%
Signal output	Standard (4-20mA, RS485) Optional RS232, voltage signal, digital output, etc.
Power consumption	100W
Protection class	IP65
light interference	The probe does not need to be equipped with a hood, and is not affected by changes in external ambient light
Moisture change light source sampling time	8ms
Sensor weight	6kg
Host weight	8Kg
Using electric	Voltage 220v Frequency 50HZ（customizable）

Standard accessories

1	host	1tower	6	12-pin aviation plug (signal output)	1strip
2	probe	1tower	7	Spare infrared light (optional)	1piece
3	Host power supply cable (3-pin aviation plug || 3-pin power plug)	1strip	8	Product Manual	1share
4	Probe power supply cable (3-pin aviation plug || 7-pin aviation plug)	1strip	9	certificate	1share
5	Host probe communication cable (12-pin aviation plug || 7-pin aviation plug)	1strip	10	Packing List	1share

Applicable industries and typical cases

Daily chemical industry	Washing powder, shampoo, cosmetics, battery powder, etc.
Tobacco Industry	Tobacco, tobacco leaves, tobacco packs, cut stems, etc.
Paper industry	Sheets of paper, cardboard, pulp, paper packs, cartons, waste paper raw materials, etc.
Wood industry	Wooden boards, sawdust, wood flour, etc.
Steel industry	Sintered material, pellet production, etc.
Food industry	Corn, soybean, rice, barley, wheat, starch, etc.
Coal industry	Coal, pulverized coal, coal quality of coal-fired power plants, etc.
Food Industry	Starch, flour, protein powder, donkey-hide gelatin, donkey-hide gelatin cake, sucrose, syrup, etc.
Textile industry	Cloth, fabric, etc.
Building materials industry	Ceramics, concrete, etc.
Pharmaceutical Industry	Pharmaceutical particle production, liquid medicine production, etc.
Feed industry	Feed production
Chemical Industry	Chemical liquid methane, ethanol, etc.
Oil industry	Crude oil underground mining, oil refining, etc.