Linear encoder is adequately sealed for measuring fish

The UK's Environment Agency is currently evaluating prototype fish-measuring rigs from Terralogic that incorporate SHG-TT linear encoders supplied by Newall Measurement Systems.

When Terralogic Ltd, a provider of rugged computers, wanted to source a linear encoder that could work in harsh outdoor conditions, the Cardiff-based company turned to the SHG-TT from Newall Measurement Systems. Now, with a handful of rigs having undergone successful prototype evaluation by the customer, UK and worldwide roll-out looks almost certain to follow.

As part of the fisheries management programme, the Environment Agency, the public body responsible for protecting and improving the environment in England and Wales, wanted to improve its methods of fish measurement; the agency had previously been using conventional notebook logging methods for monitoring fish size within inland waterways.

"The Environment Agency approached us to provide an integrated method of recording fish measurement data," explains Terralogic's Managing Director, Ken Gray. "Their existing methods were both time-consuming and open to misinterpretation."

Terralogic recommended one of its 'rugged' tablet computers to allow the agency to undertake live data capture in the field and therefore improve the lead-time and accuracy of its fish surveys. However, one dilemma confronting Terralogic was the necessity for a linear encoder with the ability to perform accurately and repeatedly in wet outdoor conditions. "We trawled the internet and caught sight of the SHG-TT from Newall," says Mr Gray. "Having checked out its specification we thought it was right for the application."

Encoders sealed to IP67

The latest SHG linear encoders are claimed to be unique in that none of the electrical or measuring components are exposed to harsh environments, and they will continue to provide accurate and reliable readings even when fully submerged in water or oil. For this reason the entire range carries an IP67 (NEMA 6) environmental rating.

These solid-state devices use digital signal processors and high-speed analogue-to-digital converters to provide rapid, accurate and repeatable positioning information. Newall SHG-TT linear encoders offer differential quadrature output at RS422 TTL levels. The units are modular and available in lengths of up to 30m.

"We did look at other makes and models of linear encoder," explains Mr Gray, "but the accuracy and waterproof functionality of the Newall unit made up our minds."

Having acquired its first SHG-TT, Terralogic set about incorporating the unit into the custom-designed fish measuring rig controlled by the company's rugged computer. A trough is used to cradle the fish while a bar is moved manually to measure its length. A single button-push on the tablet computer's touchscreen is all that is required to record its length. A Deva interface is used to link the SHG-TT linear encoder with Terralogic's rugged computer.

Working evaluation

Eight prototype rigs have now been supplied to the Environment Agency, which is currently performing a working evaluation of the product. Once the rig gets the final approval, Terralogic anticipates an extensive delivery programme incorporating the UK and the rest of the world.

Formed in 2000, Terralogic has become a UK leader in the provision of rugged computer-based systems (laptops, tablets, PDAs) that are shock-, water-, and dust-resistant. These meet or exceed MIL-STD-810E, 810F and IEC-68-2 environmental specifications. The company's international client base includes telecom engineers, geo-survey companies, the armed forces, the emergency services and civil aviation organisations. Terralogic's entire range is based on military and marine-grade environmental performance standards. Communications requirements from MESH networks to Tetra, wireless LAN and GPRS can be satisfied.

Newall Measurement Systems Ltd

Cornwall Road
South Wigston
Leicester
LE18 4XH
UNITED KINGDOM

+44 (0)116 264 2730

sales@newall.co.uk

http://www.newall.co.uk/

More applications
1 day ago
NSK bearings reduce concrete floor manufacturing machine failures to zero
Regular bearing failures in a concrete floor manufacturing machine were leading to extensive downtime, costly lost production, and high maintenance costs. To rectify the problem, the customer turned to the expertise of NSK for a redesigned wheel hub and stub axle assembly.
3 days ago
Servodrives help protect chair castors and cut packaging costs
Drives and motors specialist Yaskawa has played a key role in the development of an automated system specifically designed to fit protective plastic caps onto chair castors, using its Sigma-7 series servo-drives and a SLIO-series controller.
6 days ago
SKF streamlines bearing analysis for Ansys users
With the new SKF Bearing App for Ansys Mechanical, design engineers have instant access to accurate stiffness data on more than 10,000 bearing designations. The app is available in the Ansys Store free of charge.
6 days ago
Omron awarded platinum rating from EcoVadis for sustainability
Omron has been awarded the Platinum rating following a sustainability assessment by EcoVadis. A score earning a Platinum rating, which is the highest distinction, puts the company within the top 1% of all the businesses assessed for sustainability performance.
1 week ago
ABB Value Provider wins order for rolling mill DC drive solution
DC drive specialist Iconsys is set to deliver a bespoke drive upgrade solution comprising two 12-pulse drive suites from ABB for a UK steel mill’s payoff and tension reels, used to feed and recoil steel strip through a production line.
1 week ago
What are the design considerations when specifying lead screws?
The first in the new ‘Design • Engineer • Build’ series of video podcasts focuses on lead screws – components that are at the heart of countless engineering systems. We talk to Phil Jones at Abssac about the enduring popularity of these essential design products, and the design considerations in their specification.
1 week ago
Harting honoured with the ‘Best of Industry Award’
The industry media of the Vogel Communications Group presented their ‘Best of Industry Awards’ shortly before the turn of the year. The Harting Technology Group emerged as the winner in the ‘Electrical Equipment’ category with its Han-Modular Domino modules.
1 week ago
Quick ROI and 60% decrease in maintenance travel with remote access
Brazilian surface treatment systems manufacturer Erzinger was keen to limit service trips as much as possible to serve customers faster. By implementing IXON Cloud, it can now support its customers remotely, and work in an intuitive and secure way. It can even set up multiple simultaneous connections to work together on the same project. The result is cost reduction, quick ROI and happier customers.
2 weeks ago
Nord high up in the sustainability ranking
Nord Drivesystems was assessed by the rating agency EcoVadis and awarded the silver sustainability certificate in 2022. In the overall ranking, the North German company is in the top six percent of manufacturers in the industry assessed by EcoVadis.
2 weeks ago
Mitsubishi Electric helps door manufacturer triple its throughput
Renowned door manufacturer Profile Developments has seen a threefold increase in its productivity, thanks to its latest collaboration with Mitsubishi Electric, with a solution based on multiple FR-E series inverter or variable speed drives (VSDs) and other system-matched components, such as a GOT 2000 series HMI and MELSEC iQ-R PLC.

Login / Sign up