Stainless Steel Polished-Rod Load Cell

Production OptimizationStainless Steel Polished-Rod Load CellThe stainless steel polished-rod load cell fromWeatherford accurately measures tensile forceon the polished rod to enhance rod pump systemloading and performance. This load cell usesthe latest sensor technology and is uniquelyconstructed to ensure accuracy and durability inharsh oilfield environments.Calibrated in accordance with National Institute ofStandards and Technology (NIST) criteria, eachsensor is thoroughly tested to meet performancespecifications. The sensor housing is constructedof 300-series stainless steel and is hermeticallysealed (nitrogen gas-filled), making it imperviousto salt spray and H 2S. It is the only hermeticallysealed polished-rod load cell on the market, and isalso protected with a lightning suppression circuit.The sensor’s rugged construction minimizes theadverse effects of impact loading and ensureslong-term stability.This load cell may be ordered in various connector styles, load capacities, and output sensitivities,allowing it to be used as a direct replacement for load cells used with existing controllers.Features, Advantages and Benefits• The load cell is hermetically sealed and nitrogengas-filled, making it impervious to H 2S and saltspray, to ensure long-term stability.• The low-cost load cell is available in variousconnector styles and load capacities, allowingits use as a direct replacement for previouslyinstalled polished rod load cells.• The instrument’s rugged stainless steelhousing protects the sensor in harsh oilfieldenvironments.• Field-proven sensor technology, enhanced withtemperature compensation, ensures accurateload measurement in extreme conditions.• The unit’s lightning suppression circuit providesinvestment protection against high-voltagecurrent surges.Weatherford International Ltd.515 Post Oak Blvd., Suite 600Houston, Texas 77027 USATel: 713-693-4000weatherford.com© 2008 Weatherford. All rights reserved. 4926.00

Production OptimizationStainless Steel Polished-Rod Load CellSpecificationsRated capacity (lb/kg)10,000, 15,000, 30,000, 50,0004,536, 6,804, 13,608, 22,680Overload safe (full scale) 2.0Output full scale (mV/V ±0.5%) 1.5 or 2.0Bridge resistanceInput (ohms ±5%) 800Output (ohms ±1%) 700Maximum excitation voltage (AC or DC)20 VMaximum non-linearity (full scale)