Principle of operation
The TH-2020 γ-ray density gauge is a nuclear gauge that receives a narrow beam of radiation, through the process material, from the source holder. The amount of radiation that the detector senses is
in proportion to the amount of the materials mass. Since the radiation source and detector are always the same distance apart and the volume of process liquid is constant, the only possible change in mass is the density of the process. The lighter the density of material, the more radiation passes through to the detector. The heavier the density of material; the less radiation passes through to the detector.
Calibration of the TH-2020 associates the detector readings, known as counts, with the density of the material in engineering units. The output range of the TH-2020 is a 4-20mA current loop signal.
Typical applications
The TH-2020 γ-ray density gauges accurately indicate:
Density of liquids or slurries through a pipe or vessel wall without contact to the material
Percent of solids in a carrier
Interface between liquids flowing in a pipe, when the liquids differ in density
System overview
The TH-2020 γ-ray density gauges support 4-20mA(Current loop).The density measurement system consists of three main components:
1.Source holder
2.Scintillation Detector
3.Transmitter
Specifications
1. Measurement range: :0.3~3g/cm3
2. System Accuracy: ±1% of full range
3. Output signal (current loop):
(0~10)mA, output load1KΩ or (4~20)mA, output load700Ω
Output signal (power):source (active) mode
Output signal (load of relay): AC220V,5A (SPDT)
4. Time constant: 1-120 seconds (adjustable)
5. Repeatability: ±1 % of full range
6. Stability: ±1.5 % full range/48 hours
7. Anti-hazard classification (detector): Ex d IIC T5 (IEC60079/GB 3836)
8. Enclosure rating: IP-66 (IEC60529/GB4208 )
9. Ambient temperature : Detector (-20—60)°C, Converter (5—45)°C
10. Relative humidity: Detector(< 95 %), Converter(< 85%)
11. Power supply: AC(220±22)V at 50HZ,Wiring (Per local code)
12. Signal Cable :Maximum length (1,000 m)
4-wire hookup with DC
13. Dimensions of converter :80×160×310(mm)
14. Opening size for panel-mounted converter: Width 76+1 mm
Height 152+1 mm
15. Dimensions of detector: Φ104×474
16. Typical Sources :Cesium-137(0.66 MeV gamma radiation emitter, 30.2 year half life)
17. Real-time clock: Maintains time, date, source decay compensation
18. Diagnostics: LED indication
Contact:
Telephone: +86-931-7313068
Fax: +86-931-7313068
The Res. Inst of Chem. Mach of the Ministry of Chemical Industry was founded in Beijing in 1958, and moved to Lanzhou in 1965.
The Res. Inst of Automation of the Ministry of Chemical Industry was founded in Lanzhou in 1963.
In 1997, the Res. Inst. Of Chem. Mach of the Ministry of Chemical Industry and the Res. Inst. Of Automation of the Ministry of Chemical Industry were combined to become the Res. Inst of Chemical Machinery and Automation of the Ministry of Chemical Industry.
In 2000, the Res. Inst of Chemical Machinery and Automation of the Ministry of ChemicalIndustry completed its transformation to enterprise and registered as Tianhua Instituteof Chemical Machinery and Automation.
Tianhua Institute has the following subordinated institutions:
Supervision and Inspection Center of the Quality of Chemical Equipments in Nanjing, Jiangsu Province
Nanjing Equipment Institute in Nanjing, Jiangsu Province;
Automation Institute in Suzhou, Jiangsu Province;
Lanzhou Ruima Chemical Machinery Co Ltd in Lanzhou, Gansu Province;
Lanzhou Ruide Drying Technology Co Ltd in Lanzhou, Gansu Province;
LanzhouLantai Plastics Machinery Co Ltd in Lanzhou, Gansu Province;
Gansu Airuike Automation Technology Co Ltd in Lanzhou, Gansu Province;
The Lanzhou United Institute of Chemical Machinery and automation and the Nanjing United Institute of Petrochemical Industry Furnaces were founded by Tianhua Institute and the Sinopec.
Tianhua Institute has an occupation area of 80 000m2 and a total asset of 1 407 000 000 Yuan (RMB). The annual output value is 1 000 000 000 Yuan (RMB).
Tianhua Institute has about 916 employees, 75% of them are professional personnel. Among them are 23 professors, 249senior engineers, 226 engineers. 29 professors and senior engineers enjoy national special subsidy, On 5 people the title of Middle-aged and Young Specialist with Outstanding Contribution to the P. R. China are conferred