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The Loop Powered LVDT position transmitters HSI 750 series of loop-powered 4-20mA LVDT position transmitters is offered in measuring ranges of 1 to 10 inches (25 to 250 mm) to provide reliable, contactless position monitoring and feedback of control valves and servo actuators. They are rugged and robust devices constructed entirely of TIG-welded stainless steel and hermetically sealed against hostile environments to IEC standard IP-68. The 2-wire loop input/output connections are made through a sealed axial connector, and a mating plug is supplied with each unit.

HSI 750 series position transmitters utilize built-in electronics to offer the frictionless operation, high resolution, excellent repeatability, and low hysteresis associated with LVDT technology, along with the convenience and simplicity of a precalibrated current loop output. These transmitters have a maximum linearity error of ±0.5% of full range output using a statistically best-fit straight line derived by the least squares method.

Loop Powered LVDT position transmitters -HSI 750 series transmitters operate over a wide range of loop supply voltages and with loop resistances up to 800 Ohms, so they will work with a broad variety of servo controllers and PLCs, loop-powered analog or digital indicators, and computer-based data acquisition and processing systems.

HSI 750 position transmitters have an open bore at one end into which the LVDT's core enters. Normally, loop current will be 4 mA when the core is first inserted, increasing to 20 mA when the core is at full range within the transmitter's body. For position sensing that requires the opposite directional sense, HSI 750 transmitters are available with reversed output slope, which gives 20 mA when the core is first inserted, decreasing to 4 mA as the core moves inward. HSI 750 LVDTs are also available with metric-threaded cores and/or low friction Teflon™ bore liners, the ordering information for which is detailed below.

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