FUTURATECHNICALSOLUTION

  General Description  The ITT Barton Model 202N is a 12" circular chart recorder, capable of recording flow, temperature, and static pressure readings, that has been designed to comply with the National Association of Corrosion Engineers (NACE) standard MR-01-75 (1980 revision) Material Requirements for Resistance to Sulfide Stress Cracking for Oil Field Equipment. The Model 202N has been specifically designed with softer ,less brittle material to resist the damaging effects of Hydrogen Sulfide, even with continued exposure to high concentration in both the process and externally in the immediate environment. Component Description DIFFERENTIAL PRESSURE UNIT (DPU) :- a modified version of the Model 199 DPU (a dual bellows assembly enclosed within pressure housings) provides the recorder with differential pressure information. This information is transferred to the recorder through a Monel torque tube. STATIC PRESSURE ELEMENT :- a single weld K-Monel element that provides static p

 If the recorder operation difficulties are encountered ,refer the table below.                                                                                                                                                                              Trouble Possible Source Probable cause Corrective Action Low or No Indication Recorder Mechanism Loose linkage or movement Repair or replace as required Out of Calibration Calibrate Corroded or dirty mechanism Clean or replace Loose pen arm Tighten pen arm screw. High Indication Recorder Mechanism Loose linkage or movement Repair or replace as required Out of Calibration Calibrate Erratic Indication Recorder Mechanism Dirty or dragging linkage. Clean or ad

 Graduation lines shall be accurate to within the tolerances specified in table below. These tolerances apply to the distances between the centre  lines of the graduation lines. Rule Length Departure from nominal Up to and inc. 300 mm Over   300 mm up to and inc. 500 mm Over   500 mm up to and inc. 1 m Distance between any two graduation lines on a single scale 0.1 mm 0.2 mm 0.25 mm Distance between any two adjacent graduation lines. 0.05 mm 0.05 mm 0.05 mm Position of the 10 mm graduation line from its flat end datum 0.08 mm 0.08 mm 0.08 mm                           Accuracy of Graduation

 Calliper  Measuring instrument which evaluates a dimensional quantity of an internal or external feature of the basis of opposing contact from the movement of a slider with a measuring jaw, moving relative to a measuring scale on rigid beam and to a fixed jaw. Maximum permissible error (MPE) values apply to any indication permitted for use of calliper as defined by the manufacturer and when used in accordance with the manufacturer's recommendation .The MPE Values cannot be smaller than the digital step or the scale interval on the circular scale or vernier scale There are mainly three Error are consider in the calliper .Partial Surface contact error , E ( limited by   E MPE ) Shift Error ,S (limited by  S MPE ) Line Contact Error DEFAULT MPE (Maximum Permissible Error ) for metrological characteristics If no MPE values are otherwise stated then the values in tables apply for callipers with a measuring range up to 1000 mm and with analogue scale interval or digital step of 0.01 mm