Gamma-Ray Density Gauge

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