Isolated analog signal conditioner

The 8B43 analog signal conditioner by Dataforth includes 10 modules and has a special input circuit that provides protections against accidental connection of power-line voltages up to 240 V AC.

08/09/2012


The 8B43 analog signal conditioner by Dataforth includes 10 different modules and has a special input circuit that provides protections against accidental connection of power-line voltages up to 240VAC. Courtesy: DataforthDataforth's isolated analog signal conditioner, the 8B43, interfaces to dc linear voltage displacement transducers (LVDT) which operate on a 1 0V excitation voltage and up to 2 0mA of  excitation current.

The 8B43 family includes 10 different modules with input ranges from -1 V to +1 V through -5 V to +5 V. Each module isolates, filters, and amplifies a voltage input signal, then provides an analog voltage output.

Specific 8B43 DC LVDT applications have included measuring soil sample deformation under load to determine soil strength, controlling pill weight and thickness in making tablets from medicinal powder, continuously monitoring fluid levels as part of a leak detection system (using a hydraulic oil compatible module) and replacing limit switches to ensure higher resolution on bottle inspection machinery.

Signal filtering in the 8B43 is achieved with a 5-pole filter that is optimized for time and frequency response and provides 100 dB per decade of normal-mode rejection above 1 kHz. One pole of the filter is on the field side of the isolation barrier for anti-aliasing;  the other four are on the system side.

A special input circuit provides protection against accidental connection of power-line voltages up to 240 V ac, while clamp circuits on the I/O and power terminals protect against harmful transients. Isolation is provided by transformer coupling to suppress transmission of common mode spikes or surges. The module is powered from +5 V dc, ±5%.

Designed for installation in Class I, Division 2, hazardous locations, the 8B43 offers a high level of immunity to environmental noise.

Dataforth

www.dataforth.com 

- Edited by Chris Vavra, Control Engineering, www.controleng.com 



No comments
The Top Plant program honors outstanding manufacturing facilities in North America. View the 2015 Top Plant.
The Product of the Year program recognizes products newly released in the manufacturing industries.
The Engineering Leaders Under 40 program identifies and gives recognition to young engineers who...
World-class manufacturing: A recipe for success: Finding the right mix for a salad dressing line; 2015 Salary Survey: Manufacturing slump dims enthusiasm
2015 Top Plant: Phoenix Contact, Middletown, Pa.; 2015 Best Practices: Automation, Electrical Safety, Electrical Systems, Pneumatics, Material Handling, Mechanical Systems
A cool solution: Collaboration, chemistry leads to foundry coat product development; See the 2015 Product of the Year Finalists
Digital oilfields: Integrated HMI/SCADA systems enable smarter data acquisition; Real-world impact of simulation; Electric actuator technology prospers in production fields
Special report: U.S. natural gas; LNG transport technologies evolve to meet market demand; Understanding new methane regulations; Predictive maintenance for gas pipeline compressors
Cyber security cost-efficient for industrial control systems; Extracting full value from operational data; Managing cyber security risks
Getting ready for industrial IoT; Visualizing the (applied) automation continuum; Preventing VFD faults and failures; Using wireless for closed-loop applications
Migrating industrial networks; Tracking HMI advances; Making the right automation changes
Understanding transfer switch operation; Coordinating protective devices; Analyzing NEC 2014 changes; Cooling data centers

Annual Salary Survey

After almost a decade of uncertainty, the confidence of plant floor managers is soaring. Even with a number of challenges and while implementing new technologies, there is a renewed sense of optimism among plant managers about their business and their future.

The respondents to the 2014 Plant Engineering Salary Survey come from throughout the U.S. and serve a variety of industries, but they are uniform in their optimism about manufacturing. This year’s survey found 79% consider manufacturing a secure career. That’s up from 75% in 2013 and significantly higher than the 63% figure when Plant Engineering first started asking that question a decade ago.

Read more: 2014 Salary Survey: Confidence rises amid the challenges

Maintenance and reliability tips and best practices from the maintenance and reliability coaches at Allied Reliability Group.
The One Voice for Manufacturing blog reports on federal public policy issues impacting the manufacturing sector. One Voice is a joint effort by the National Tooling and Machining...
The Society for Maintenance and Reliability Professionals an organization devoted...
Join this ongoing discussion of machine guarding topics, including solutions assessments, regulatory compliance, gap analysis...
IMS Research, recently acquired by IHS Inc., is a leading independent supplier of market research and consultancy to the global electronics industry.
Maintenance is not optional in manufacturing. It’s a profit center, driving productivity and uptime while reducing overall repair costs.
The Lachance on CMMS blog is about current maintenance topics. Blogger Paul Lachance is president and chief technology officer for Smartware Group.
This article collection contains several articles on the vital role that compressed air plays in manufacturing plants.