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Level Sensors

For any liquid, tank type or application the best Level Sensor Technology

For maximum resource efficiency, the accurate, continuous detection of level, volume or mass is essential. We have the right technology, be it Potentiometric, Hydrostatic, Differential Pressure or Guided Wave ...

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Life Sciences
D3P Differential Pressure & Level Transmitter - Level Sensors - Img  - anderson-negele

D3P Differential Pressure & Level Transmitter

New D3 Pharma Differential Pressure and Level Transmitter which is the most complete electronic differential transmitter with best-in-class performance and dual mA output developed for Life Science Industry

Life Sciences
L3P Pressure and Level Transmitter - Level Sensors - Img  - anderson-negele

L3P Pressure and Level Transmitter

New L3 pharma Pressure and Level Transmitter to measure process pressure or hydrostatic level in sanitary process applications for Life Science Industry.

Food & Beverage
Dairy
D3 Differential Pressure & Level Transmitter - Level Sensors - Img  - anderson-negele

D3 Differential Pressure & Level Transmitter

The D3 is Anderson-Negele’s NEW differential pressure/level transmitter for applications in food, dairy and beverage processing plants.

Dairy
Food & Beverage
L3 Pressure and Level Transmitter - Level Sensors - Img  - anderson-negele

L3 Pressure and Level Transmitter

The Anderson-Negele L3 Pressure and Level Transmitter was designed to measure process pressure or hydrostatic level in sanitary process applications.

Food & Beverage
SL Inventory Grade Hydrostatic Level Transmitter - Level Sensors - Img  - anderson-negele

SL Inventory Grade Hydrostatic Level Transmitter

Hydrostatic level transmitter for atmospherically vented vessels

Food & Beverage
NSL-F Continuous Level Sensor - Level Sensors - Img  - anderson-negele

NSL-F Continuous Level Sensor

The NSL-F is the next generation of potentiometric technology. It is a direct replacement for the LN and offers additional features.

Food & Beverage
NSL-M Compact Potentiometric Level Transmitter - Level Sensors - Img  - anderson-negele

NSL-M Compact Potentiometric Level Transmitter

Probe type process level transmitter is the compact, high temperature alternative to the NSL-F

Food & Beverage
HB Control Grade Hydrostatic Level Transmitter - Level Sensors - Img  - anderson-negele

HB Control Grade Hydrostatic Level Transmitter

Hydrostatic level sensor for pasteurization balance tanks

Food & Beverage
LD

LD “Top Mount/Dipstick” Level Transmitter

Top down hydrostatic level transmitter for non-conductive liquids

Food & Beverage
Life Sciences
TDL DP Level Transmitter for Pressure/Vacuum Vessels - Level Sensors - Img  - anderson-negele

TDL DP Level Transmitter for Pressure/Vacuum Vessels

Differential pressure based level transmitter without capillary

Life Sciences
SX Life Sciences Series Hydrostatic Level Transmitter - Level Sensors - Img  - anderson-negele

SX Life Sciences Series Hydrostatic Level Transmitter

Life Sciences series hydrostatic level transmitter for open vessels

Food & Beverage
LT Multi Channel Level Monitor - Level Sensors - Img  - anderson-negele

LT Multi Channel Level Monitor

The Liqui-Track 800 can be ordered with one or two input modules to accommodate four or eight tanks and multiple output options

Life Sciences
LA Life Sciences Series

LA Life Sciences Series “Top Mount” Level Transmitter

Life Sciences series top down hydrostatic level transmitter

Food, Beverage and Dairy
Microcell Bolt-On Load Cells - Level Sensors - Img  - anderson-negele

Microcell Bolt-On Load Cells

Bolt-on strain gauge sensors for vessels with metal substructures and skirted silos

Food, Beverage and Dairy
L-Cell Bolt-on Load Cells - Level Sensors - Img  - anderson-negele

L-Cell Bolt-on Load Cells

Bolt-on dual-axis shear force sensors for all types of vessels with metal supports and skirted silos

Food, Beverage and Dairy
LD360s Load Disc - Level Sensors - Img  - anderson-negele

LD360s Load Disc

The Sanitary Specialist: Dynamic content measurement through precise weight measurement, polished design for all hygienic applications

Food, Beverage and Dairy
LD3 Load Disc - Level Sensors - Img  - anderson-negele

LD3 Load Disc

The Allrounder: Dynamic content monitoring through precise weight measurement, for all industrial applications

Food, Beverage and Dairy
LD3xi Load Disc - Level Sensors - Img  - anderson-negele

LD3xi Load Disc

The High-Precision Process Expert: Up to 0.03% accuracy in dynamic content control through weight measurement

Food, Beverage and Dairy
LD3xiC Load Disc - Level Sensors - Img  - anderson-negele

LD3xiC Load Disc

The High-Precision Process Expert: Up to 0.03% accuracy in dynamic content control through weight measurement, extremely robust design with cage

Food, Beverage and Dairy
TC1 / TC2 Tension Cell - Level Sensors - Img  - anderson-negele

TC1 / TC2 Tension Cell

High precision process pressure measurement in pipes & hydrostatic level and volume measurement in vessels

Food, Beverage and Dairy
Load Stand II - Level Sensors - Img  - anderson-negele

Load Stand II

The fully integrated all-in-one weighing system for all types of large containers and silos

How can sanitary level sensors help you optimize processes?

For achieving the best production processes and highest resource efficiency, it is imperative to have accurate and continuous monitoring of the level, volume, or mass in storage or process tanks. We offer the most appropriate level measurement technology for all types of tanks, media, and applications, including hydrostatic, potentiometric, weight measurement, radar and differential pressure.

Which hydrostatic instrumentation does Anderson-Negele offer?

Our wide range of pressure sensors meets the diverse needs of sanitary applications in industries such as dairies, breweries, food, and beverage. Additionally, for the particularly high requirements of the life science industry, we have many models designed specifically in a special pharmaceutical version.

The range extends from the low-cost all-rounder P42 with IO-Link, to the high-end L3 model. The latter offers intelligent electronics with improved temperature compensation thanks to an integrated temperature measuring cell, density compensation for media and integrated tank linearization for different, integrated or customer-specific vessel shapes. This allows direct output in gallons, pounds, PSI or many other units with significantly higher measurement accuracy than comparable devices. For outdoor applications or in cold or humid environments, the LAR can avoid measurement errors caused by climate-induced drift due to a special, hermetically welded measuring system. For Differntial Pressure Control the D3, based on the technology and specification of the L3 Level sensor, offers a solution with two pressure detectors and an integrated electronic device for Differential Pressure output.

Which potentiometric level sensors does Anderson-Negele offer?

The NSL measuring system is the core technology from which a comprehensive range of sensor variants is derived. This means that there are virtually no limits to the variety of applications:

  • NSL-F: Level sensor with integrated electronics and programming display
  • NSL-FR: Remote version with separate electronics, ideal for installation in difficult-to-access locations or in the event of strong vibrations at the process
  • NSL-F-01: Curved version for installation in the tank side wall
  • NSL-F-02: Dual probe for installation in non-metallic vessels
  • NSL-M: Mini variant for data output to the PLC, without display
  • IO-Link in Flex Hybrid technology: available for all NSL-F variants

Which weighing systems does Anderson-Negele offer?

In many applications, weighing systems for level detection offer a more practical and accurate solution than other measuring techniques. With a field-proven sensor program, Anderson-Negele also offers precise, robust and efficient solutions in this metrology range.

In many process vessels, storage tanks and silos, precise inventory control is a particular challenge. Classic instrumentation such as hydrostatic sensors, potentiometric probes or radar often reach their limits. In certain application environments, they are not precise, fast or flexible enough, not practical for technical reasons or not economical for cost reasons. The following systems are available. To provide a solution with weighing technology, following systems are available:

  • Weighing modules Load Disc
  • Load Stand weighing systems
  • Bolt-On load cells

Which technology is best suited for a given situation?

Many factors influence the choice of technology:

  • Type, size, shape, and material of the container
  • Fluid media or solid particles such as granules, powder…
  • Material properties (liquid, pasty, adhesive, foaming, conductive / non-conductive…)
  • Required measurement accuracy
  • Media temperature and density and their dynamic variation
  • Changing media or always the same medium
  • Location (outside, inside) and climatic influences on the measurement technology
  • Pressurized environment (atmospheric pressure or pressurized tank)

What is hydrostatic level measurement?

Level Control - Hydrostatic sensors installed in tanks or vessels offer precise level measurement

The hydrostatic pressure is the pressure inside a liquid and always acts vertically towards all limiting walls of the container. As the level in such a vessel rises, so does the pressure. A sensor (transmitter) at the bottom of the vessel, can measure, display and output this pressure variations to the PLC. Since the pressure acts on all sides, the sensor diaphragm can be mounted at the bottom of the vessel or laterally at the bottom edge of the vessel, depending on which installation situation is more suitable.

To transmit the measurement results to the PLC, pressure transmitters use a piezoelectric signal converter internally, which converts the mechanical process pressure from the pressure diaphragm into a proportional voltage signal. This is then converted into a 4…20 mA standard signal or other protocol according to the customer’s adjustment.

Modern measuring systems, such as the L3, already offer the possibility of converting the measured pressure values in the sensor electronics and thus directly outputting volume or mass. For this purpose, further parameters must be determined, such as the container shape, the medium, and the process temperature (for the calculation of the respective specific density). In the case of the L3, the integrated temperature compensation provides a higher accuracy over the entire process temperature range than conventional hydrostatic level transmitters. This enables the display of the sensor in gallons, pounds, PSI or other volume or pressure units with a very high measuring accuracy, even with dynamic temperature curves.

In an open system (vessel with atmospheric pressure), a pressure sensor at the bottom of the vessel is sufficient, since the external pressure conditions do not change.

A closed system (pressurized vessel), on the other hand, can be subjected to varying pressures, which affects the pressure at the bottom of the vessel. To measure the level in such a system, two sensors are required which separately determine the process pressure at the bottom and the head pressure at the top. The differential pressure can then be calculated from this in the PLC or an evaluation unit, and thus the correct fill level displayed.

How does a hydrostatic pressure transmitter work?

The pressure sensor is installed in the vessel wall with the pressure diaphragm perpendicular to the vessel contents. The process or level pressure deforms the diaphragm. This deformation is transmitted by a capillary fluid to a measuring cell with a piezoelectric signal converter, which converts the process pressure into a corresponding voltage signal. The electronics in the sensor head convert this in turn into the industry standard used, such as analog 4…20 mA or HART 7.0, according to the customer’s adjustment. This allows the hydrostatic pressure to be output as an electrical signal to the PLC.

What’s the difference between relative and absolute pressure gauges?

In relative pressure sensing elements, the back of the diaphragm is vented, meaning the transducer measures process pressure relative to atmospheric pressure. In absolute pressure cells, the vacuum created during the manufacturing process remains between the diaphragm and the base body, i.e. the sensor measures the pressure relative to the vacuum. Since the atmospheric pressure can change, e.g. due to meteorological influences, the measuring accuracy is generally higher for absolute measuring cells.

What is temperature compensation for pressure transmitters?

The L3 pressure, level and flow sensor has been specially designed for measuring liquids in the food and beverage industry, where a high accuracy under dynamically changing temperature conditions is crucial for process control. This sensor uses a piezoelectric signal converter and in addition an integrated temperature sensor to measure the pressure and temperature of the internal capillary fluid. The mV signal of the signal converter and the resistance of the temperature sensor are converted to an adjusted pressure value by the signal electronics in the sensor nozzle.

This temperature compensation avoids measurement errors that are caused, for example, by the temperature effect or temperature drift: with changing temperatures, the specific density of a medium also changes, among other things. If this density is calculated for the level output at 20°C, but the process temperature is 80°C, then the measured value output is incorrect.

Conventional sensors show a temperature drift of up to 0.4% per 10°C. At 110 °C it is over 2.5%! The L3, on the other hand, shows a temperature drift of 0.03% per 10°C due to the reference on the calibrated measuring range. At 110°C, the temperature effect is less than 0.4%, i.e. six times lower.

What is potentiometric level measurement?

Level Sensors - Potentiometric

The potentiometric measuring principle works with the change in the voltage ratio between the electrode rod of the sensor, which projects into the liquid, and the metallic wall of the filled tank. This changes proportionally to the height of the medium in the tank itself, can be recorded with high precision and output as a measured value via the electronics. This measurement technique is only applicable for liquids which feature an electrical conductivity, at Anderson-Negele from <50μS/cm.

The potentiometric measuring method is suitable for closed and open process, feed, and storage tanks as well as for pressurized tanks. For non-metallic tanks, a sensor variant with a reference rod can be used.

How does a potentiometric level sensor work?

The sensor consists of an electronic unit and a measuring rod that protrudes into the liquid in the tank. Installation is possible from above, from below, diagonally and, thanks to a version with a bent measuring rod, also in the side wall of a tank. The length of the measuring rod can be precisely matched to the tank in 10 mm increments (intermediate sizes on request) up to a maximum of 3 m.

In the medium, the sensor generates an electric flow field, formed by the electrical conductivity and the capacitive properties. This creates a voltage ratio that is exactly proportional to the immersed part of the rod length. Since only the ratio of the voltages is considered, the properties of the medium, in particular the electrical conductivity, don’t influence the measurement result.

In the NSL, the sensor determines the immersion state of the electrode rod in the medium as additional information via a second, patent-pending, measuring method. This is based on the evaluation of the electrical resonance properties and ensures that foam is detected and proportionally blanked out. Faulty measurements due to adhesion and foam are thus reliably avoided.

Which products and applications are suitable for potentiometric level measurement?

Due to the insensitivity to foam and buildup, the excellent measuring accuracy, and the extremely short response time, the measuring technology is suitable for a wide range of media and applications in dairies, breweries, milk and beverage processing companies, and in the food and life science industries. The only basic requirements are the conductivity of the medium and the container height limitation to max. 3 m.

The flexible and modular NSL sensor system offers reliable and precise application, even with difficult media and in demanding applications. That covers:

  • all kinds of fluids such as product, CIP media, water…
  • applications such as milk heaters, bottling plants, ice cream plants, separators, brewing tanks, lauter tanks, horizontal tanks…
  • strongly or differently foaming media such as beer, juices, dairy products…
  • pasty media or media adhering to the sensor rod, such as creams, ice cream, ketchup, sauces…
  • pressurized tanks
  • fast level changes, e.g., during filling
  • non-metallic tanks
  • different media in one tank (automatic adaptation to changing media)
  • tank shapes with limited installation possibilities
  • production environments with high mechanical or
  • chemical stress (cleaning agents)

Which signals and parameters can be acquired and output?

The high-precision measurement process and intelligent electronics in the various NSL versions offer many different signals:

  • Level height for 4…20 mA or digital IO-Link signal with <1% measuring accuracy
  • Dry running warning signal
  • Warning signal failure
  • Signal limitation underflow / overflow
  • Error limitation underflow / overflow
  • Signal simulation (3.95…20.05 mA)

It enables the setting of the following parameters:

  • Fill level zero point / offset
  • Level Slope / Gain
  • Attenuation / Filter
  • Physical unit

What is the inventory measurement by weighing systems?

Inventory Sensors - Weighing Systems

In many applications weighing systems for level detection offer a more practical and precise solution than other measuring techniques. With a field-proven sensor program, Anderson-Negele also offers precise, robust, and efficient solutions in this measuring range.

In many process vessels, storage tanks and silos, precise fill quantity determination is a particular challenge. Classical measuring systems such as hydrostatic sensors, potentiometric probes or radar often reach their limits. They are not precise, fast, or flexible enough in certain application environments, not practical for technical reasons or not economical for cost reasons.

This is particularly the case with:

  • Process vessels with agitator. Here, no sensors can be installed that protrude into the medium. The amount of substance is often in motion, which creates dynamic transverse forces. In addition, it must be possible to measure and control precisely dosed and dynamically added ingredients with high precision in such vessels, even during the running process. Closed stirring systems with negative or positive pressure are also possible.
  • Interchangeable movable containers for ingredients, such as in yogurt mixing. For connection reasons, but also for cost reasons, these cannot be equipped individually with level sensors.
  • Horizontally stored tanks. Here, a small change in fill level already causes a large change in volume, and the inherent movement (sloshing) of liquids can make measurement by level sensors difficult. Load cells allow for more reliable results here.
  • Tanks for dry bulk material, where irregular mass distribution (formation of piles, funnels, ratholes, etc.) can make surface measurement incorrect. With such tanks or silos, classic continuous level probes are often also not possible due to their size / height.

The solution: Turn your container into a precision scale. For more information, see the Kistler-Morse Website with its Weighing Systems product section.