General Description Nivelco Level Switch
As Nivelco Level Measurement and Control concentrate on the manufacture of industrial level measurement and control products, NIVELCO is now a world-class level specialist, based in Hungary. NIVELCO’s strength originates from the solid base created by a family business, guided over 80 turbulent years.
NIVELCO has established and maintained a leading and respected world market position, and has sold more than 1 million units of level instrumentation so far: NIVELCO is now one of the largest ultrasonic level transmitter producers in the world.
- Nivelco Nivomag Level switches
Types of Nivelco Level Switch
Nivelco has a big range for Level Switches, such as :
Nivelco NIVOFLOAT NL–100 Float Level Switch
The NIVOFLOAT NL–100 type float level switch featuring mercury-free contact is suitable for level switching of drinking water, raw water or polluted liquids with low solid content. The double-chambered float and the sealing of the cable outlet provide hermetic sealing and water-proof operation.
The NIVOFLOAT NL–100 is floating on the level of the measured liquid because its relative density is less than the water. The level switching is done when the contact reaches the ±45° switching angle. The switching differential of the level switch is adjustable by the position of the counterweight on the cable. The level switches should be arranged appropriately in case of multi-level switching tasks to avoid undesired tangling of the cables.
PRODUCT PROPERTIES
- Operation without power supply
- Low cost polypropylene level switch
- Airtight, dual-walled chamber
- Mercury-free micro switch
- Adjustable switch differential
- For low density liquids
APPLICATIONS
- Level switch from potable water to sewage
- Suitable also for tanks and basins
- Fail-safe indication and pump control
- Water / wastewater industry
Specification :
- Switching angle : ±45°
- Medium temperature : 0…+50 °C (+32…+122 °F)
- Process pressure : up to 1 bar (14.5 psi)
- Material of the float : Polypropylene
- Material of the counterweight : Polystyrene
- Float volume : 430 cm3(26.25 in3)
- Rating of the micro switch: 10(4) A, 250 V AC, AC1
- Electrical life-span : 10? switches
- Ingress protection : IP68
- Cable : Ø9 mm (0.35″) / 3 × 1 mm2 (AWG17)
- Cable length : 5 m (196.8″), 10 m (393.7″), 20 m (787.4″)
- Weight (without cable) : 250 g (0.55 lb)
Nivelco NIVOFLOAT NW–100 Float Level Switch
The NIVOFLOAT NW–100 tilting level switch featuring mercury free contact is suitable for level switching of sewage, polluted liquids or drinking water. The double-chambered float and the sealing of the cable outlet provide hermetic sealing and water-proof operation.
The float should be immersed to the required level and fixed if needed. At the given level, the float will switch by tilting. The special shape of the float ensures proper tilting without using a counterweight.
Specification
- Switching differential: ~400 mm (15.7″) (constant)
- Medium temperature: 0…+50 °C (+32…+122 °F)
- Process pressure: up to 2 bar (30 psi)
- Material of the float : Polypropylene
- Float volume : 1000 cm3 (61 in3)
- Rating of the micro switch : 10(3) A, 250 V AC, AC1
- Electrical life-span: 10? switches
- Ingress protection: IP68
- Cable : Ø9 mm (0.35″) / 3 × 1 mm2 (AWG17)
- Cable length : 5 m (196.8″), 10 m (393.7″), 20 m (787.4″)
- Weight (without cable) : 1.1 kg (2.4 lb)
Nivelco NIVOCONT K Conductive Level Switch
NIVOCONT K level switches, based on the conductivity principle, can be applied to liquids with conductivity higher than 10 ?S/cm. For detecting the level, probes are immersed into the medium. These probes (and the tank wall if conductive) serve as contacts of an electric circuit. Probes can be of single or multiple rod versions. A maximum of 4 probe rods can fit in the multiple probe socket with an additional reference probe if tank wall is not conductive.
The probe length should be in accordance with the level to be detected. When the liquid level reaches the probe, it will create a change in the conductivity of the loop and the output relay will be activated. The device senses the conductivity difference between the probes and the reference probe. The KLP separators should be used at every 0.5 m to provide appropriate distance between the probes.
PRODUCT PROPERTIES
- Reasonable price
- Limit switch or differential switch versions
- Adjustable sensitivity
- Adjustable delay
- High or low fail-safe mode
- All wetted parts stainless steel
- Compact unit with two independent relays
- Separate probe and relay unit
- Rod probes up to 3 m
APPLICATIONS
- Conductive liquids with minimum 1 x 10-5 S/cm conductivity
- Fail-safe indication and pump control
- Chemical industry
- Water / wastewater industry
Specification
| Supply voltage: | 24…240 V AC/DC |
|---|---|
| Ambient temperature: | ?20…+50 °C |
| Process temperature: | up to +200 °C |
| Process pressure: | up to 16 bar |
| Output: | 250 V AC, 16 A or 8 A |
| Process connection: | ?”, 1½” |
| Ingress protection: | IP65 / IP67, IP20 |
Nivelco NIVOMAG MK-200 Magnetic Float Level Switches
The NIVOMAG MK-200 series magnetic float level switches are used for level point detection of liquids in all type of vessels. Operation without external power, side or top mounting, wide temperature ranges, various process connections, stainless steel wetted parts and Ex versions make it applicable in the industrial chemistry, pharmacy, petrol industry etc.
Permanent magnet operated by the movement of a float will activate an other magnet inside the switching enclosure. This second magnet operates a special switch. So the movement of float is transferred to the potted switch through separated magnetic coupling ensuring the requirements of the wet process and Ex application. Special balancing construction and various accessories (see figures of DIMENSIONS) give wide range of possibility of the installation.
Installation according to the requested application may carry out on the basis of drawings and tables. The balance of the arms with differential length is provided by the counter weight shifted to the proper point at the vertical type MKA-23_. Hysteresis switching points will be adjusted on the vertical stick with fixing rings. Function of the switch may be tested without dismantle of the instrument by the installed MMK tester. Minimal length of the arm is not shorter than 100 mm in that case.
PRODUCT PROPERTIES
- Operation without power supply
- Micro-switch separated from the process
- All wetted parts are stainless steel
- Side or top mounting
- Fixed or adjustable switch differential
- Submersible versions
- Various process connections
- Operational check via an optional tester
- Flame-proof variants
- SIL 1 approval
APPLICATIONS
- Liquids with minimum 0.7 kg/dm3 density
- Fail-safe and control level switches in closed tanks
- Ballast tanks of ships
- Chemical industry
- Food and beverage
- Power plants
- Oil industry
- Water industry
Specification
| Ambient temperature: | ?20…+80 °C |
|---|---|
| Process temperature: | ?50…+250 °C |
| Process pressure: | up to 25 bar |
| Output: | 250 V AC, 10 A NO/NC |
| Process connection: | flanges or 2″ thread |
| Ingress protection: | IP65, IP68 |
| Approvals: | ATEX, IEC Ex, INMETRO, DNV (Marine), BV (Marine), SIL 1 |
Nivelco NIVOPOINT MAGNETIC TRACKING LEVEL SWITCHES
Nivelco Level Switch magnetic float level switches use the interaction between a magnet in the float and the reed switches
in the probe. The float moves along the stem, following the level of the liquid and activating the reed-switches. As the
float moves along the reed switches, it changes their state (NO / NC), and they stay triggered until the liquid’s level falls, and the float moves along the reed switches again, breaking off the self-holding state and restoring the previous state of the reed-switches.
The mini version does not contain biasing magnets. By following the level, the magnetic float activates the reed switches in the probe. The reed switches opens or close according to the position of the magnetic float. The default state is when the float is at the bottom position.
The mini version of the NIVOPOINT magnetic float level switch is suitable for small tanks. The small size and easy
installation make it perfect for detecting the maximum, minimum, or intermediate level using the tank’s or device’s
connection stubs made for other purposes
PRODUCT PROPERTIES
- Operation without power supply
- Reed switch connection
- Wetted parts stainless steel or plastic
- Up to 5 switching points
- Vertical adjustability of all switching points
- Various process connections
- Flame-proof variants available
APPLICATIONS
- Liquids with a minimum 0.4 kg/dm3 density
- Multi-point level switch in closed tanks
- Foaming liquids, chemicals with dense vapor or gas layer above the surface
- Chemical, oil industry
- Food and beverage
- Power plants
- Oil & Gas
- Water industry
Specification
| Ambient temperature: | ?40…+95 °C |
|---|---|
| Process temperature: | ?40…+150 °C |
| Process pressure: | up to 25 bar |
| Output: | 250 V AC, 3A |
| Process connection: | 1″, 2″ or flanges |
| Ingress protection: | IP67, IP68 |
| Approvals: | ATEX, BV (Marine) |
Nivelco VIBRATING FORK LEVEL SWITCHES FOR LIQUIDS and Solids
Nivelco Level Switch vibrating fork level switches are suitable for level detection of liquids or granular, powdered solids. Units with parallel vibrating fork are suitable for liquids, units with non-parallel vibrating fork are suitable for solids. Mounted on pipes, silos, tanks or hopper bins filling/emptying can be controlled using these devices just as well they can generate fail-safe alarms providing overfill- or dry run protection.
The operation principle is based on the electronic circuit exciting the fork probe making it vibrate. As the medium reaches and covers the fork its vibration changes, or stops. The fork will start vibrating freely again as the medium sets it free. The electronics senses the change of vibration and gives output signal after a selected delay. Plastic coated version is recommended in aggressive mediums, highly polished version is recommended for abrasive mediums.
The PNP/NPN transistor output versions can be connected directly to PLC, or relay unit. The NIVOSWITCH vibrating forks are able to solve switching tasks of high current loads with the help of UNICONT PKK switching amplifiers. The UNICONT PKK-312-8 Ex intrinsically safe switching unit is designed to serve Ex rated vibrating forks.
MAIN FEATURES
- Compact and mini compact type
- Rod extension up to 3 meters (10 feet)
- Polished vibrating part
- Hygienic versions with various process connections and 0.5 micron fine polishing
- Adjustable sensitivity
- Relay or electronic output
- Switching performance does not depend on the change of liquid conductivity, dielectric constant, pressure and temperature
- Medium temperature max. +130 °C (266 °F)
- Output test with optional test magnet
- IP67, IP65/IP68 protection
PRODUCT PROPERTIES
- No moving parts
- Self-cleaning in most mediums
- Stainless steel and plastic coated probes
- Pipe extension up to 3 m
- Various output configurations
- High or low fail-safe mode
- Plastic, aluminum or Stainless steel housing
- Explosion-proof variants available
- For corrosive, thick, turbulent, flowing liquids
- Medium pressure: up to 40 bar
APPLICATIONS
- Most liquids with minimum 0.7 kg/dm³ density and maximum 10? mm²/s viscosity
- Chemical industry
- Food and beverage
- Power plants
- Oil industry
- Water industry
Specification
| Supply voltage: | 20…255 V AC, 20…60 V DC |
|---|---|
| Ambient temperature: | ?40…+70 °C |
| Process temperature: | ?40…+130 °C |
| Process pressure: | up to 40 bar |
| Output: | 1 or 2 relays (SPDT), 2-wire AC / DC, transistor (PNP, NPN) |
| Process connection: | 1″, 1½”, 2″ or flanges or hygienic fittings |
| Ingress protection: | IP67, IP68, IP65 |
| Approvals: | ATEX, IEC Ex, DNV (Marine), UKCA Ex |
Nivelco NIVOROTA Rotary Pddle Level Switches
NIVOROTA rotary paddle level switches detect the level of lumpy substances, powders, grains, or granules. Mounted
onto tanks, silos, or hoppers, it monitors and controls the filling and dumping of stored materials, such as stone, ash, sand, coal, feed, beet slices, etc.
A small electric motor drives the paddle, which rotates freely in the absence of material. When the material reaches the paddle, the motor is switched off, and the output switch is triggered. When the material level drops, the paddle is free to spin again, the motor is reactivated, and the switch returns to its original state.
The NIVOROTA E?700 & E?800 series Rotary Paddle Level Switches provide all the advantageous features of the previous series in one unit. Dust Ex versions are available for use in hazardous environments.
PRODUCT PROPERTIES
- Plastic or aluminum housing
- Long service time
- Motor shut-off feature
- Flexible coupling
- Solid rod or flexible cable extension (0.3…3 m)
- Sealed bearings
- High-temperature version
- Dust-Ex variants available
- High or low fail-safe
- Feed, coal, sand, rocks, limestone, metals, rubber
- Rotary force independent of the supply voltage
- Low supply voltage is indicated by a blinking LED
APPLICATIONS
- Granules and powders with minimum 0.1 kg/dm³ density
- Agriculture
- Construction materials
- Chemical industry
- Food and beverage
- Mining industry
- Paper mills
- Recycling
- Plastic industry
Specification
| Supply voltage: | 24 V AC/DC, 120 V AC, 230 V AC |
|---|---|
| Ambient temperature: | ?30…+60 °C |
| Process temperature: | ?20…+200 °C |
| Process pressure: | up to 3 bar |
| Output: | relay (SPDT) 250 V AC, 6 A, AC1 |
| Process connection: | BSPT 1″, 1½”, mounting plate |
| Ingress protection: | IP67 |
| Approvals: | ATEX, UKCA Ex |
Nivelco NIVOCONT R Vibrating Rod Level Switches
The NIVOCONT R series of vibrating rod level switches are robust instruments designed for low and high level indication of granules and powders with a minimum of 0.05 kg/dm³ density. Mounted on tanks, silos or hopper bins it can control filling / emptying, or give fail-safe alarm signals. The highly polished version is recommended to use for abrasive mediums.
The operation principle is based on that the electronic circuit excites a vibration in the rod probe. When the medium reaches and covers the rod, its vibration stops, when the medium leaves the rod it returns to vibrate freely. The electronics senses the change of vibration and gives output signal after a selected delay
PRODUCT PROPERTIES
- No moving parts
- Self-cleaning for most mediums
- Stainless steel vibrating section
- Pipe extended (0.3…3 m) or flexible cable length (1…20 m)
- Plastic or aluminium housing
- Selectable density
- High or low fail-safe mode
- Selectable switching delay
- Dust-Ex models
- For grain, flour, plastic granules, cement, fly ash, etc.
- 5 years warranty
APPLICATIONS
- Granules and powders with min. 0.05 kg/dm³ bulk density
- Agriculture
- Construction materials
- Chemical industry
- Food and beverage
- Mining industry
- Power plants
- Paper mill
- Recycling
- Plastic industry
Specification
| Supply voltage: | 20…255 V AC/DC |
|---|---|
| Ambient temperature: | ?30…+60 °C |
| Process temperature: | ?30…+160 °C |
| Process pressure: | up to 25 bar |
| Output: | relay (SPDT) or electronic switch (SPST) |
| Process connection: | 1½” |
| Ingress protection: | IP67 |
| Approvals: | ATEX, IEC Ex, UKCA Ex |
Source: nivelco.com
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