Position sensor has programmable measuring range
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Variohm Eurosensor product story
Edited by the Engineeringtalk editorial team
May 13, 2009
Variohm Eurosensor has launched a cable extension 'string-pot' position sensor featuring a user programmable measuring range up to 3,175mm.
The sensor also features a user selectable output voltage and a durable construction that is ideally suited to industrial wet environments and challenging outdoor position measurement applications.
The SR1V from Celesco also offers mounting flexibility with its integral mounting bracket and moveable rear cover facilitating many alternative positions for measuring cable exit and integral electrical connection.
The electrical and mechanical flexibility allows a single product solution across many applications for draw-wire or string-pot type position sensing, eliminating the need to specify and purchase multiple stroke ranges.
The SR1V is factory programmed for its full range of 0 to 3,175mm with a 0-10V DC and 4-20mA outputs.
Reprogramming the SR1V is carried out in-situ and involves only the removal of the rear cover and adjusting the zero and span pushbuttons located on a digital controller board in combination with extending the measuring cable between the required positions.
Within the full mechanical range, the user can select and guarantee optimum voltage output over any range.
Furthermore, the output voltage can be adjusted and its polarity reversed using four signal selection dip switches on the controller board covering selectable ranges of 0 to 5, -5 to +5, 0 to 10 and -10 to +10V DC and 4-20mA.
A 15-30V DC supply with 50mA current powers the unit with electrical connection via a four-pin, M12 connector, which is supplied complete with mating half.
A 4m-long cordset with a fitted M12 connector is available as an option.
The SR1V is rated to IP67 protection levels for dust and water immersion and a ruggedised polycarbonate housing helps to ensure an operating temperature range of -40C to +85C.
Installation is straightforward with no critical alignment required.
The spring-loaded and nylon-coated stainless-steel cable is attached to the object under motion and fully retracts into the body of the SR1V requiring a compact installation envelope within 200mm x 120mm x 100mm.
The plastic-hybrid precision potentiometer returns a rated life of 250,000 cycles and an output signal update rate of 1ms ensures fast response for a maximum linear velocity of 2m/s and acceleration to 10g on retraction.
Positional accuracy is specified at 0.5 per cent FS with repeatability to 0.1 per cent FS.
The SR1V was originally designed as an OEM solution for off-road construction equipment but its durable and flexible construction will suit applications in agricultural machinery, water and waste treatment and processing equipment requiring washdown.
As a low-cost position sensor with a true one-size-fits-all capability, the SR1V will also interest general purpose users and OEMs across all industries, said Variohm.
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Contact Variohm Eurosensor
Tel +44 1327 351004
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