Gamma-Ray Level Gauge

Principle of operation     The TH-2011 γ-ray Level Gauge is a continuous level nuclear gauge.The gauge receives a shaped or collimated beam of radiation from the source holder through the process material.The material in the vessel acts as a shield that prevents a portion of the detector from exposure to the radiation field.As the process material level decreases, the detector senses more radiation.As the process material level increases, the detector senses less radiation.Calibration of the level gauge associates the detector readings, known as counts, with the level of the material in engineering units.The output range of the gauge is a 4-20mA current loop signal, in proportion to the level of the process. Typical applications     The level gauges accurately indicate the level of liquids or bulk materials in vessels, eactors, or tanks. In order to achieve a level indication over the desired length, it may be necessary to use more than one detector.     The accuracy of quality control systems that use TH-2011γ-ray level gauges is profitable to a wide range of industry operations.A number of applications that use a level gauge are:     Pulp and Paper         Liquors         Bleach plant chemicals         Coating chemical storage         Lime mud         Wastewater treatment tanks     Chemical         Low pressure/low vapor chemical storage         Settlers         Surge tanks     Food and beverage         Food slurries         Pastes         Syrups         Dough level         Intermediate batch storage     Water and wastewater         Settling/aeration tanks         Clarifiers         Sludge holding tanks         Wet wells    The TH-2011 γ-ray level gauges especially used as a non-contact, level measurement transmitter for containers (mixers, reactors, hoppers, silos, tanks) e.G.With the material and liquids which has the characteristic of high temperature, pressure, viscosity, corrosion and severe toxicity.    TH-2011 can detect the interface between liquids(solids)  in a vessel, when the liquids(solids) differ in height. System overview     TH-2011 γ-ray level gauges support 4-20mA(Current loop).The level measurement system consists of three main components:     1.Source holder     2.Scintillation Detector     3.Transmitter Specifications     1.  Measurement range: 100—3000mm     2.  System Accuracy: ±3 % 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: 1-60 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/GB3836)     8.  Enclosure rating: IP-66 (IEC60529/GB4208)     9.  Ambient temperature : Detector (-20—50)°C, Converter (0—50)°C     10.  Relative humidity: Detector(< 90 %), Converter(< 90 %)     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: Φ139×(336+L)     16.  Typical Sources :Cesium-137(30.2 year half life)                                           Cobalt-60(5.3 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