UWT Nivobob NB 3000 User Manual

Continuous level measuring system
NB 3000
Technical information / Instruction manual
page
Introduction
The Nivobob
®
NB 3000 is an electromechanic level measuring
instrument for continuous measuring of level or volumes in silos,
hoppers or tanks.
Applications
• Powder, granulate, small or coarse bulk goods
• Interface measurement (solids in water)
Available for industries such as
• Chemistry
• Food
• Cement
• Mining
• Plastics
• others
Features
Process
• Suitable for most types of bulk goods
• Independent of bulk material properties, such as:
Dielectricity and conductivity of the bulk good
Dusty atmosphere in the silo
Changing humidity inside the product
Products that tend to stick
• No mechanical load on the silo roof, the sensor weight
just touches the surface of the material
• Very accurate measurement
Service
• Simple installation and commissioning
• Measurement principle easy to understand
• Rope, tape and (optional) motor with increased service life
• Low maintenance
Approvals
• Approval for use in Hazardous Locations
Mechanic
• Measurement range up to 50 m (164 ft)
• 1½" process connection possible
• Different sensor weights, suitable for every application
• Internal tape cleaner for difcult materials
• Window in lid and external start button (optional)
• Robust cast housing, ingress protection IP66
Electronic
• Micro processor controlled measurement
• Comprehensive diagnostics possibilities
• Output 0/4-20 mA/ Modbus/ Probus DP/ counting pulses
• Programmable relais (can be used as level limit switch outputs)
• Measurement start with external signal or integrated timer
Function
The Nivobob
®
NB 3000 is mounted on the top of the silo. A
sensor weight is driven down into the silo. It is mounted at the
end of a rope or tape which is wound on a motor driven roller.
Upon contact with bulk material, the motor changes the winding
direction and the sensor weight is driven back to the upper stop
position.
During downwards movement of the sensor weight the distance
is electronically measured by the rotations of the internal rope /
tape roller. The microcontroller converts the measured distance
into an output signal, which is a volumetric signal based on the
silo geometry. The output signal is updated, when the sensor
weight touches the bulk material.
Diagnostics
Comprehensive diagnostics possibilities are present:
• Measurement control is done by comparing the moved
distance between up and downward movement and checking
for discrepancy. In case of discrepancy, the sensor weight is
pulled to the upper stop position to ensure, that the sensor
weight is not inside the silo.
• Service interval after a certain amount of measurements and
running time.
• Internal control of motor, motor driver electronic and smooth
movement of rope/ tape rollers.
Diagnostics is in accordance with NAMUR recommendation
NE107.
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UWT Nivobob NB 3000 Specifications

General

Brand	UWT
Model	Nivobob NB 3000
Category	Measuring Instruments
Language	English