Current Loop Web Tension Indicators
Last Updated: April 1, 2025
Description
Current Loop Web Tension Indicators are devices used to measure and display the tension in a web, which is a continuous flexible material such as paper, film, or foil. These indicators utilize a current loop to transmit the tension measurement signal, providing a reliable and consistent output that can be used for monitoring and controlling the tension in various industrial processes.
Working Principle
Current Loop Web Tension Indicators operate by using sensors, such as strain gauges or variable inductors, to detect the tension in the web. These sensors convert mechanical deflection caused by tension into an electrical signal. The signal is then transmitted through a current loop, which is a method of sending an analog signal over long distances with minimal signal loss. This ensures accurate and real-time feedback, which is crucial for maintaining consistent web tension. The use of current loops is particularly beneficial because they are less susceptible to electrical noise and can maintain signal integrity over long cable runs.
Applications
Current Loop Web Tension Indicators are used in various industries where precise tension control is critical. For example, in the printing industry, they ensure that paper or film is fed through the printing press at a consistent tension, preventing issues such as misalignment or tearing. In the packaging industry, they help maintain the correct tension on films used in wrapping or sealing products, ensuring uniformity and quality in the final product.
Advantages over other Web Tension Indicators
One of the main advantages of Current Loop Web Tension Indicators is their ability to maintain signal integrity over long distances, which is a significant improvement over voltage-based systems that can suffer from signal degradation. Additionally, current loops are less affected by electrical noise, making them more reliable in industrial environments where electromagnetic interference is common. This reliability and accuracy make them preferable in applications where precision is paramount.
Limitations
Despite their advantages, Current Loop Web Tension Indicators can have limitations. For instance, they may require more complex installation and calibration compared to simpler systems. Additionally, the initial cost of setting up a current loop system can be higher due to the need for specialized sensors and signal conditioning equipment.
Considerations
When considering the use of Current Loop Web Tension Indicators, it is important to evaluate the initial costs, which can be higher due to the need for specialized components and installation. However, the long-term benefits of improved accuracy and reliability can offset these initial expenses. Operating expenses are generally low, as current loops are efficient and require minimal maintenance. In terms of durability, these systems are robust and can withstand harsh industrial environments, but regular calibration and maintenance are necessary to ensure continued accuracy. Replacement and maintenance costs should also be factored into the decision-making process, as these can vary depending on the specific components used in the system.
from ABB Measurement & Analytics
MC 400 covers most mechanical arrangements. This means the user only has to follow the step-by-step instructions in order to set up the controller and to have a correct strip tension calculated. Predefined standard measurement modes. Prepared to calculate true strip tension from all mechanical... [See More]
- Control Signal: Analog Voltage Output; Current Loop Output; Switched Output; Pulse / Frequency; Serial / Digital; Network / Fieldbus Output
- Features: PLC
- Control: Limit; Linear; PID
- Form Factor: Chassis
from Dover Flexo Electronics, Inc.
Its stable output and versatility in managing web tension in the most challenging applications are unmatched. The SteadyWeb6 maintains a pre-selected tension set point on a web machine or press by measuring web tension from a tension transducer (or transducer pair), and then sending a compensating... [See More]
- Control Signal: Analog Voltage Output; Current Loop Output
- Form Factor: Chassis; Wall-Mount Full Enclosure
- Features: Rate Indication/ Control
- Interface: Digital Front Panel
from FMS USA, Inc.
The CMGZ309 tension controller responses to a broad range of missions. Its field of application is in production lines where moving web products are manufactured, processed or finished. As a plug & play unit a minimum of tuning tasks are required. Functions can be configured very easily via a... [See More]
- Control Signal: Analog Voltage Output; Current Loop Output; Switched Output
- Form Factor: Chassis; DIN
- Control: PID
- Interface: Digital Front Panel
from Dover Flexo Electronics, Inc.
The EasyViewTM Tension Indicator is a small, general-purpose device for the measurement and display of process web tension. Using Quik-CalTM digital technology, the unit is zeroed and calibrated simply using push buttons. In addition to amplifying the signal output from tension transducers installed... [See More]
- Control Signal: Analog Voltage Output; Current Loop Output
- Form Factor: Chassis; DIN; Wall-Mount Full Enclosure
- Features: Rate Indication/ Control
- Interface: Digital Front Panel (optional feature)
from FMS USA, Inc.
The CMGZ600 series controller integrates many functions into one compact housing. It offers selectable control of unwind brake or drive, intermediate drive, or winding drive. The CMGZ600 series controller is available in a 2 channel version offering 2 independent closed loops for tension control of... [See More]
- Control Signal: Analog Voltage Output; Current Loop Output
- Form Factor: Chassis
- Features: PLC
- Interface: Digital Front Panel
from Dover Flexo Electronics, Inc.
The EasyWeb ™ is an open loop torque controller designed to maintain constant web tension or provide taper tension to center driven rewind or unwind applications. Web tension is regulated by controlling motor or brake torque based on varying levels of roll diameter. An Inertia compensation... [See More]
- Control Signal: Analog Voltage Output; Current Loop Output
- Form Factor: Chassis; Wall-Mount Full Enclosure
- Features: Rate Indication/ Control
- Interface: Switches; Digital Front Panel
from Dover Flexo Electronics, Inc.
The TriView Left-Right-Total tension indicator displays web tension on a large, bright LCD touch screen. Total tension is continuously displayed digitally and on a simulated analog scale readout. By tapping the touch screen a machine operator can select either left and right tension readings below... [See More]
- Control Signal: Analog Voltage Output; Current Loop Output
- Form Factor: Wall-Mount Full Enclosure
- Features: Rate Indication/ Control
- Web: Tension Indication/ Control
from Dover Flexo Electronics, Inc.
The TriView Left-Right-Total tension indicator displays web tension on a large, bright LCD touch screen. Total tension is continuously displayed digitally and on a simulated analog scale readout. By tapping the touch screen a machine operator can select either left and right tension readings below... [See More]
- Control Signal: Analog Voltage Output; Current Loop Output
- Form Factor: Chassis
- Features: Rate Indication/ Control
- Web: Tension Indication/ Control