Process industries often depend on high performance valve actuation in harsh environments. Most instrumentation positioners would fail quickly when subjected to these harsh environments. For example, smart positioners require internal electrical components which are extremely vulnerable at high temperatures and may prematurely fail when exposed. Young Tech Company (YTC) has developed two smart positioner products to thrive under these conditions which have paved the way to expansion and growth in tough process control applications.
Remote sensing unit positioners:
The YT-3301 introduced the concept of isolating and detaching the sensing feedback portion of the positioner from the main control housing. The sensing unit accurately detects the position of the valve stem and provides a feedback signal to the main housing. This dual unit design allows the operator to locate the precision electronics elements at a considerable distance from the valve environment, providing the best of both worlds – precision engagement at the point of valve movement and a clean, dry and ambient temperature for the electronics. This also facilitates mounting multiple control housings in close proximity for convenient and time saving monitoring and adjustment of valves in the plant.
Triple module remote positioners:
Remotely mounting the sensing unit provides dramatically improved reliability and performance, but at longer distances between the sensing unit and the control housing pneumatic signal loss may occur. In extreme situations this could lead to hunting and oscillation of the electronics and reduced valve and actuator positional stability.
To assure superior performance in these difficult applications, YTC has developed the YT-3302 Positioner. With this product a third module, housing the driving components of the pilot valve and torque motor assembly, is mounted at an intermediate location between the remote sensing unit and the main control unit. Accordingly, the three modules are the sensing unit, driving unit and control housing. As the sensing unit contains the most robust components and the control the most sensitive, this configuration delivers higher performance with dramatically increased positional accuracy.
