The SP400 and SP500 smart, digital positioners consume approximately 1% of the air of a traditional electro-pneumatic positioner. The SP400 features a simple menu system and auto-stroke calibration at the press of a single button resulting in reduced commissioning time. The SP500 is a full-featured smart digital positioner with optional retransmission of valve position and the ability to use a separate 24 Vdc power supply and communications protocols as well as diagnostics. — Spirax Sarco
A few circumstances in a data center make it ripe for a CHP design to boost efficiency. Let’s get into the options within both relevant chiller types, why payback may be shorter than expected, and the assorted potential benefits from lower costs to higher reliability. Some tips from an array of manufacturers’ reps round out this useful investigation.