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Nitus Gamma Backscatter Gauge Download petroleum brochure. Download desalting brochure.
The non-contacting Thermo Scientific Nitus Gamma Backscatter Gauge provides highly precise online measurement of density and level in the largest tanks and pipes to increase production time, plant safety and profitability.
The internationally-compliant Nitus system is based on patented (patent #7469033), non-contacting gamma backscatter technology that responds instantly to significant density and level changes to avoid tank overspills and other upset conditions. It uses a reduced source size yet precisely measures the thickest process materials, including sludge, slurries and paste, to keep the process online and provide a strong return on investment.
The Nitus Gamma Backscatter Gauge measures the density or level of thick, highly viscous process materials in the largest tanks and pipes with unmatched precision. Unlike traditional sensors, the durable gauge uses non-contacting, non-intrusive technology that is unaffected by corrosive, abrasive, high temperature and/or high pressure process
materials to ensure minimal maintenance and long instrument life.
The system features groundbreaking technology that is powered by a small source to ensure a safer working enviroment and lower capital costs. In fact, the amount of energy emitted by the source can be reduced by a factor of 200
without sacrificing precision or rapid response.
Both the Nitus source and detector mount to the same side of the vessel or pipe without having to shutdown the process, reducing downtime. Installation costs are also minimized because the non-intrusive system mounts to the outside of the vessel, meaning no thermo well, site holes or other vessel modifications are nececssary.
The system can be setup using a Thermo Scientific 9734 Handheld Terminal, HART Communication module, Foundation Fieldbus (using HART 475) module or TMT Comm via a laptop. A user-friendly menu enables quick configuration to expedite installation and start-up.
The Nitus density and level gauge offers numerous features and benefits:
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Highly sensitive detector enables system to respond instantly to process changes to avoid overspills and other upset conditions
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Non-contacting, non-intrusive technology ensures low maintenance and long life
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High accuracy and repeatability via small gamma source (100 mCi/3.7 GBq or less) improves plant safety and lowers capital costs
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Unique design offers unmatched reliability, stability and sensitivity
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Zero drift over a wide temperature range ensures stability of detector for superior measurement accuracy
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Source and detector install on same side of vessel or pipe without having to shutdown the process
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The source head is encased in tungsten steel for maximum protection and is contoured to match the vessel radius to ensure no radiation scatters from the shutter to increase plant safety
Mining Applications
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Control of flocculant feed and underflow draw in paste tanks
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Bottom level control for clarifiers
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Solids level control and output control on hydrotreaters
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Density control at specific levels on settling tanks
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Heavy media separation for control of solids
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Measurement of soda ash density on large pipes
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Measurement of process material in tailings pipes
Petroleum Applications
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Tar sands separators and froth treatment settlers
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PVC tanks
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Reactor vessels
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Auto-clave vessels: high temp and high pressure processes
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Alkylation units
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Gypsum production
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HF Alky for emulsion control
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Dissolving tank water level control (Styrene)
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Asphalt level control
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Atmospheric and vacuum towers
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Fractionation column level control
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FCCU units
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Acid settling tanks
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Desalters and separators
The Nitus system is engineered for maximum return on investment and offers several unique advantages:
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The Thermo Scientific Model 6000 source head is designed to be flush with the curvature of the vessel or pipe to ensure maximum vessel wall penetration
of the gamma energy emitted by the source
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The Nitus scintillation detector is the most stable and sensitive of its kind and enables the system to use a smaller source size to
achieve rapid response and high measurement precision. In fact, the detector uses 50% less energy than traditional scintillation detectors and is able to maintain zero signal noise. Its circuitry is not affected by temperature and the integrated transmitter design ensures durability in the most rugged environments
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Dynamic Process Tracking (DPT) reduces the normal averaging constant by a factor of eight, enabling the Nitus system to respond instantaneously to significant density and level changes
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For density measurement, a logarithmic function ratio linearizer is resident in the software to allow for one-point calibration. For level applications, a break point linearizer allows any non-linear vessel wall variations to be offset, ensuring high precision measurement on any shape of vessel
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Up to 16 process alarms can be set in addition to the built-in system fault and warning alarms to maximize system uptime. The system's software automatically detects faults and corrects any errors to further ensure reliable,
ongoing operations.
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Performance Specifications
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Precicsion
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Level measurement: ±0.5% of total span on steel wall thickness up to 3.81 cm and material density of up to 2.2 g/cm3
Density measurement: ±0.001 g/cm3 on steel wall thickness of 2.54 cm and material density of up to 2.2 g/cm3; ±0.003 g/cm3 on steel wall thickness of 3.81 cm and material density of up to 2.2 g/cm3
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Response Time
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1 to 37 seconds
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Ambient Temperature Field
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Standard: -40°C to +75°C (-40°F to +167°F)
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Gamma Ray Source
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Source Type
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Cs-137 stainless steel, doubly encapsulated
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Source Size
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10-1,000 mCi (0.37-37 GBq) Cs-137 (source size dependent upon application; most mining applications require 100 mCi /3.7 GBq or less)
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Durability
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Tested to 1,000,000 on/off cycles with no failures; Fire-tested to 1093°C (2000°F) for four hours; shock-tested for multiple drops from one meter to concrete; Maximum temperature rating of 800°C (1472°F)
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Housing
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Source encased in tungsten within carbon steel or stainless steel housing
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Functional Specifications: Transmitter Detector
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System Architecture
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Two options available: integrated electronics or remote electronics. Multiprocessor-based electronics for uninterrupted output during data entry and system interrogation All user data doubly-stored in non-volatile memory with no battery backup required
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Detection Type
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PVT plastic scintillator with wide dynamic range; resists shock and moisture damage
Dual PMT configuration improves signal-to-noise ratio
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Detector Stabilization
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Electronic control without heater stabilization for optimum performance
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Power
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115/230 VAC, 50 to 60Hz, 500 mA max
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Software
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Comm PC Interface Software: Interface with up to 32 Nitus units over RS485 Loop; RS485/RS232 converter provided
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Programming
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HART Smart Model 475: used to setup and calibrate gauge, and to enter data; Communicates with any Nitus or 375 system via the current loop; BEL202FSK standard
Thermo Scientific Model 9734 Handheld Terminal (HHT): used to setup and calibrate gauge and to enter data; Communicates with Nitus system via the RS485 connector; Provides upload/download of gauge configuration
to/from PC via RS232 interface
TMT Comm
Foundation Fieldbus (FISCO compliant)
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Operating Temperture Range
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-40°C to +75°C (-40°F to +167°F) ambient
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Inputs
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Signal from another Nitus detector; additional input for gas density compensation or buildup available; Dry contact closure; Temperature compensation circuitry with 100 ohm platinum RTD 2 or 3 wire
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Current Outputs
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4-20 mA isolated, loop-powered into 800 ohms, field-scalable; 4-20 mA isolated, self-powered into 800 ohms, field-scalable; 4-20 mA non-isolated, self-powered into 800 ohms, field-scalable
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Serial Outputs
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RS485 half-duplex; RS232 full-duplex (optional with HART or Foundation Fieldbus)
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Source Decay Compensation
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Selectable Cs-137 or Co-60
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Linearization
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Logarithmic and multi-point characterization
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Circuitry
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Digital; Fully-integrated
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Physical Specifications
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Electrical Connections
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Two 3/4-in NPT fittings; HART Communicator interface connects directly into 4-20 mA loop
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Interface Cable
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Shielded 14 to 22 gauge Belden 9318
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Transmitter Display
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Backlit LCD with two lines, 16 alphanumeric characters; Powered from electronics; Maximum separation from electronics 91.4 m (300 ft)
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Mounting Hardware
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Detector: Integral bolt-on bracket; Source head: Integral bolt-on bracket
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Housing
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Detector: Carbon steel, polyurethane painted
Source head: Carbon steel or stainless steel construction with tungsten core; Two position rotary shutter, lockable in both "open" and "closed" position
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Detector Size
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Density Measurement: 2-ft (0.6 m) detector mounted perpendicular or horizontal to pipe; Application dependent
Level Measurement: 1-ft (0.3 m) increments from 1-ft to 4-ft (0.3 m to 1.2 m); Multiple detectors can be wired together for large measurement spans
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Weight, Detector/Electronics
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Dependent on application; Consult Thermo Fisher Scientific
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Certifications
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CSA/US
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Detector: Class I, Div 1, Groups B, C and D; Class II, Div 1, Groups E, F and G; Class III; T6; Type 4X Encl
Local display: Class I, Div 1, Groups E, F and G; Class III, Div 1, hazardous locations; Type 4 Encl
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ATEX Hazardous Area
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Detector: Ex II 2 G Ex d IIB±H2 Gb T6 [Ta = -40°C to +75°C]; Ex d IIB+H2 Gb T5 [Ta = -40°C to +85°C] (remotely-mounted electronics certified to maintain rating)
Local display: Hazardous enclosure: Ex 2 G Ex d IIC T6 [amb -40°C to +60°C]
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CE
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CE Mark
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IECEx
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CSA 10.0009
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