Limit Switch  Manufacturers, Traders, Suppliers

We are your competent partner for level measurement in all kind of solids applications.
Our strengths are in bulk solid handling based on our product lines Rotonivo, Vibranivo, Capanivo, Nivobob (UWT plumb bob system) and Nivowave, but we also offer competent solutions for other tasks.
Worldwide we are renowned for our ability to provide customized solutions.
Our products are distinguished by their easy handling, extreme reliability and high durability.

Rotonivo®

• SIL 2 compliant
• World ´s first universal voltage electronics
• Rotation principle insensitive to caking
• Robust aluminium die cast housing
• Adjustable sensitivity (DC >15 g/l)
• Protected motor (friction clutch & double bearing)
• Long lifespan (brushless synchronised motor)
• Temperature range from -40°C to +1,100°C
• High quality grade stainless steel (process)

Vibranivo®

• PFA and Teflon coating
• High sensitivity (DC < 5 g/l)
• Surface roughness of 0.75 μm
• Temperature range from -40°C to 150°C
• NAMUR Standard
• Suitable for overpressure up to 16 bar
• Extremely robust short version
• High quality material in the process
• Level control of sediments in liquids

Capanivo®

• Independent of silo wall
• Temperature range from -40°C to +180°C
• Variety of supply voltages
• Adjustable switching delay
• High sensitivity (DC > 1.5 g/l)
• Overpressure up to 25 bar
• Approvals for dust explosive environments
• Variety of mechanical versions

RFnivo®

• Bulk materials with very low DC value > 1.5 g/l
• Applications with process pressure up to 25bar
• Vibration in the container
• High safety standard
• High hygiene requirements
• Simple to install and set up
• PFA coating
• Temperature range from -40°C up to +500°C
• High quality process materials (VA 1,4571/1,4404, ceramics, PPS)

Nivobob®

• Overpressure version up to 1.7 bar
• Temperature range from -40°C to +250°C
• Integrated tape cleaner
• Diagnostics function
• Measurement range of up to 70m
• Simple installation and set up
• Measuring Range up to 500,000 cycles
• Remote programming, analysis for up to 10 instruments
• Comm. via Modbus RTU or Profibus DP

Nivotec®

• Level monitoring and visualisation

Rotonivo®

• Strong caking
• Dusty environments
• Abrasive materials
• Extreme process temperature
• Over pressure and low pressure environments
• Explosive environments
• Heavy mechanical loading
• Electrostatic charging
• Various changing factors

Vibranivo®

• Extremely light product density
• Pneumatic filling
• Process overpressure
• Limited space
• Vibration within the vessel
• High reliability requirements
• High hygienic requirements
• Sediment levels in liquids
• Explosive environments

Capanivo®

• Dusty environments
• Light materials
• Pneumatic filling
• Overpressure
• Explosive environments
• Corrosion resistance for aggressive material
• High chemical resistance
• High standard of safety requirement
• Caking

RFnivo®

• Dusty environments
• Abrasive media
• Extreme process temperatures
• Positive and negative pressure
• Hazardous areas
• Heavy materials
• Caking bulk solids

Nivobob®

• Strong caking
• Material with changing temperature and humidity
• Electrostatic charging
• Heavy material
• Limited space
• Low dielectric constant
• Explosive environments
• Large measurement distances
• Aggressive environments (noisy, dirty)

PTL Hermann GmbH develops and manufactures vibration type level switches for detecting the presence or absence of powdered or granular solids that are stored in all kinds of silos, hoppers and containers. The products get distributed worldwide.
Principle of operation:
a vibrating system gets forced to vibrate on its resonance frequency by a piezo crystal drive. If filling material, (bulk solids), covers the vibrating blade of the probe, its vibration gets damped. This is sensed by the electronic circuit and the output switches. When the blade gets uncovered due to declining level, the instrument restarts to vibrate and the output switches back.

Product Overview
LEVELSWITCH CV120 / CV130 / CV140 / CV150
Vibrating level switch for all kinds of powdered and granular solids. Applicable for heavy materials like cement as well as for light materials with densities down to 20 grams/litre. Grain size from powder to max. 40mm. Process connection 11/2", insertion lengths 172mm up to 20m.
STOCKTROL CV210 / CV310 / CV410 / CV510
Vibrating level switch for all kinds of powdered and granular solids. For heavy materials as well as for extremely light materials like styrofoam with densities even down to 10 grams/litre. Grain size from powder to max. 20mm. Process connection 11/2", insertion lengths 190mm up to 20m
CV600/CV660
Low-Cost vibrating level switches for grained and granular solids with minimum densities of 20 grams/litre (CV660: 50 grams/litre) and max. grain sizes of 10mm. Process connection 1", insertion length 157mm
SHT 120/130/140
Vibrating level switch for powdered and granular solids with high process temperatures up to 250°C. Process connection 11/2", insertion lengths 184mm up to 4m.

The instruments can be used for overfill protection, for high or low level alarm and in a special configuration for the detection of interfaces, e.g. sand that has settled in water (special model SEDIMENT).
The unique, patented single rod designs of our instruments make them work perfectly and reliably even at critical applications where conventional products cause problems due to bridge building, material build-up or rat holing.

Berthold's Process Control division offers solutions for the non-contacting measurement of level, density, concentration, bulk flow and moisture. As the global leader in radiometric technology our products are characterized by an outstanding measurement performance and reliability.

• Chemical industry and refineries
• Paper Industry
• Power Plants
• Mining, coal and coke
• Steel industry
• Food industry

- Chemical industry and refineries
- Paper Industry
- Power Plants
- Mining, coal and coke
- Steel industry
- Food industry