Spring-Loaded Sensors for Gauging Applications

Macro Sensors has introduced the GPA series of spring-loaded linear position sensors, packaged as a low-cost alternative for general-purpose gauging applications. The AC-operated linear variable differential transformers (LVDTs) are claimed to maintain the same quality and performance associated with Macro Sensors LVDTs but at a moderate cost. The GPA series of spring-loaded gauge heads are said to be ideal for use in non-harsh environments for general positioning and gauging applications in assembly operations, machine tool and production line inspection as well as quality control and testing laboratories.

Specific applications for the AC-LVDTs include position feedback for pinch and gap roller alignment in printing operations, gauging the thickness of sheet metal during metal forming and stamping operations and ensuring critical dimensions for brake-pad manufacturing machines. Designed specifically to meet the needs of the industrial gauging and OEM marketplace, the GPA series of spring-loaded sensors is available in a variety of ranges from +/-0.050in (+/-1.25mm) to +/-2.00in (+/-50.0mm), with a maximum linearity error of +/-0.25 per cent FRO.

Made of stainless steel, the front end of the spring-loaded LVDT has a 1/2-20 UNF 2A thread on the housing, allowing the user to install the device into a mating threaded part, or, alternatively, 'bulkhead' mounted using two furnished hex nuts. Connected to any standard (differential input) LVDT signal conditioner, these AC-operated spring-loaded sensors provide a variety of analogue or digital outputs.

Electrical interface is via a 3ft-long, 32AWG, six-conductor, Teflon-insulated/-shielded cable. The entire package meets IEC standard IP-61. Sensors work with programmable logic controllers, limit-switching relays or users' own conditioning electronics/systems. Packaging the GPA series spring-loaded LVDTs with Macro Sensors Eazy-Cal Mini-Module LVDT signal conditioner lowers the cost of an installed system, according to the company.

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