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Macro Sensors’ HStar 750 Series hermetically sealed position sensors offer a highly accurate and long-life system for position measurement of steam control valves in power generation plants.

Constructed of stainless steel, these 19mm diameter AC-operated position sensors operate in environments with high temperatures up to 200C.

Installed within the harsh environs of a steam plant, HStar 750 position sensors can provide highly accurate position feedback of different control valves, providing output to remotely located electronics and/or control systems.

For example, a typical two-stage steam turbine can contain a number of control valves – governor valve, throttle valve, interceptor valve, reheat stop valve – all of which are operated by hydraulic actuators.

Because the governor and throttle valves are modulating valves whose steam flow is of paramount importance to the efficiency of the turbine, it is critical to know their positions.

It is also important to know if the interceptor and stop valves are either fully opened or closed.

HStar 750 sensors can provide the necessary position output to signal an operator if something is not working properly.

The cost to the plant operator of improper operation and inefficiency due to wrong valve settings can result in as much as several million pounds a year.

Along with resistance to high temperatures, HStar 750 units feature high resolution, excellent repeatability and low hysteresis as well as the high sensitivity consistent with good linearity.

This means operators do not need to change out units frequently and can rely on output to maintain optimum plant operations.

Electrical termination of the HStar 750 series is made through a sealed radial connector located near one end.

The radial connector results in a through-bore design that permits access to either or both ends of the unit’s core for better mechanical support and core guidance, and easier cleanout in dusty or dirty locations.

As the radial connector has a shorter installed length, HStar 750 Series sensors are at least 5cm shorter than comparable units, with an axially mounted connector for easier installation in tight spaces.

Available in ranges of +/-1.25mm to +/-250 mm, HStar 750 sensors are offered in several standard options, including metric threaded cores, smaller diameters and low-mass cores.

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