MKXII Controller
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OSCILLAMATIC CONTROLLER Williams Instrument Incorporated is proud to announce its latest addition to its existing line of pneumatic Oscillamatic® Controllers – the MK XIIA. Maximum Corrosion Resistance, Minimum Maintenance The MK XIIA combines the advantages of 316SS Stainless Steel construction for maximum corrosion resistance and the Diaphragm-Style design for minimal maintenance to provide for optimum performance Wide Supply Pressure Range (30 – 100 psig) Accuracy and Repeatability (± 1.75% @ 30 PSI to ± 2% @ 45 SPM with clean, dry instrument air) Standard Materials of Construction: 316SS (all parts exposed to Air/Gas supply) Versatility: 1-45 SPM standard speed range with 10:1 turndown achieved in one setting Shipping Weight: Dimensions: Height: Diameter: Inlet & Outlet: Minimum internal moving parts Easy assembly and disassembly DESIGN IMPROVEMENTS RECOMMENDED APPLICATIONS Compact size and lightweight Corrosive Environments and Gases (onshore or offshore) Diaphragm design for cleaner operation and reduced maintenance V and W Series Pneumatic Plunger Pumps Hardened 17-4 ph Stainless Steel seats LD and HD Series Pneumatic Diaphragm Pumps New bolt design for easy access to diaphragms for maintenance Retrofitting of any older style pump controller Bottom plug allows for servicing of pilot plug and lower spring Available with 3-15 CSM port hole upon request CONTROLLER COMPARISON SUPPLY PRESSURE BODY MATERIAL ELASTOMER OPTIONS SPOOL STYLE Neoprene, Buna N, Viton® Anodized Aluminum Neoprene, Viton Anodized Aluminum Neoprene, Viton 201 Ivyland Road • Ivyland, PA 18974 USA • (800) 235-3421 • (215) 293-0415 • Fax: (215) 293-0498 • E-mail: info@williamspumps.com

OSCILLAMATIC CONTROLLER PHYSICAL / FUNCTIONAL DESCRIPTION The MK XIIA Controller operates on the same operating principal as the MK X Controller. The MK XIIA has the same upper and lower chambers, but are separated with flexible diaphragms rather than sliding seals. A capillary tube, controlled by a needle valve, transfers the supply air/gas from the lower to the upper chamber. When the spool is in the highest position, a pilot plug closes a vent and opens the supply air/gas to the pump. When the spool is in its lowest position, the pilot plug prevents the supply air/gas from entering the...