Macro Sensors Loop-Powered Spring Loaded Position Sensors

Macro Sensors, which specializes in the manufacture of LVDT-based linear sensors and gaging probes, offers GHSI 750 Series position sensor, a DC-operated position sensor that is spring-loaded and offers a two-wire, loop powered 4 – 20 mA operation commonly used with current-operated process controllers and recorders. Built-in loop powered electronics result in a position sensor that operates from a DC input and generates a 4-20 mA output that interfaces with many PLCs, computer-based data processors, and QC data collection systems, and with loop resistances up to 800 ohms.

Hermetically sealed and constructed entirely of stainless steel, the coil windings are sealed against hostile environments to IEC standard IP-68. Macro claim these position sensors can be installed in hazardous locations while the wiring connected to power supplies, indicators and controllers are in a safe environment.

GHSI 750 Series position sensors consist of a spring-loaded shaft running in a precision sleeve bearing and connected to the core of an LVDT. The use of a precision-sleeve bearing results in measurement repeatability of 0.000025 inches (0.6 m) or better. A spring-extended plunger is guided by precision sleeve bearings. The probe shaft is fully extended by a spring exerting a nominal force of 6 to 20 ounces depending upon total range. Macro Sensors supplies an AGD standard number 9 contact tip that is made from chrome plated hardened tool steel and is fully interchangeable with other AGD contact tips.

Available in ranges of +.100 inch (+2.5 mm) to +4.00 inches (+100mm), the maximum linearity error for a GHSI 750 Series position sensors is 0.10 of full range output using a statistically best-fit straight line derived by the least squares method.