New line of valve positioners stands up to chemical and food processing applications for complete valve automation in harsh environments. The series are part of a comprehensive line of pneumatic and electro-pneumatic positioners, including auto-calibrating "smart positioners" with automatic DA and RA detection, and an explosion-proof, FM/CSA-approved model. Built for high-performance valve automation applications, the series includes corrosion-proof stainless steel and explosion-proof models. The explosion-proof electro-pneumatic positioner is available in both FM- and CSA-approved versions, designed to withstand and contain explosions inside the enclosure, preventing release of flames to the surrounding areas. Enhanced process-protection models lock down the system via a fail-freeze function in the event the 4-20mA input signal is lost. For applications requiring greater cost economy, the line of electro-pneumatic positioners is available in rotary (EPR) or linear (EPL) configurations. The series positioners accept an analog 4-20 mA input signal, and have rugged aluminum diecast enclosures and stainless steel gauges standard. These vibration-resistant positioners provide precise calibration with simple span and zero adjustments, are repeatable within ±0.5 percent F.S., and are certified by NEMKO for ATEX and Eex md IIB T5. PP series pneumatic positioners utilize an input signal of 3-15 psi, capable of direct or reverse action with split range available. Like the electro-pneumatic line, the pneumatic positioners are available in rotary (PPR) or linear (PPL) versions, and have various orifices available to increase or decrease flow as required.
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