Optima Scale OPD-E Manuals

OPTIMA SCALE MANUFACTURING INC. 1 OPD-E Analytical Balance Maintenance Manual Menu Chapter I: Count Value Adjustment Chapter II: Balance Adjustment Chapter III: Corner Error Adjustment Chapter IV: Model Setting Chapter V: Linearity Calibration Chapter VI: External Weight Calibration Chapter VII: Correction of Internal Calibration Weight Value Chapter VIII: 200g Full Scale Correction Chapter IX: Temperature Compensation Chapter X: Inspection Chapter XI: Failure and Maintenance OPTIMA SCALE MANUFACTURING INC. 2 Chapter I: Count Value Adjustment I. Disassembly of Balance Shell: 1. Disassembly of rear cover: Remove three M4 inner hexagon screws under the rear label of the balance and then disassemble the rear cover. 2. Disassembly of lower cover plate: erect the balance, remove 6 pieces of M3 cross-head screws and then disassemble the stainless steel rear cover of the balance. 3. Disassembly of upper cover plate: remove two front M4 inner hexagon screws under the balance and then disassemble the upper cover plate. 4. Disassembly of baffle: remove two middle M4 screws under the balance and then loosen the baffle. 5. Disassembly of windshield: remove two M3 inner hexagon screws at the front in the balance and then loosen the front glass of the windshield. After that, press the left and right glass (note: adhesive strips for the left and right glass are pasted in the sheath) and then remove the entire windshield. II. Adjust the Zero and Full Scale Count Value: 1. Adjust the balance, install the balance pan and the balance pan bracket, and then switch on the power supply. 2. Under the standby condition, only the decimal point flickers or “PEFIL” is displayed or only the ON sign is displayed on the LCD. 3. Press CAL and then 1 is displayed on the LCD; press TARE and then 2 is displayed on the LCD; after that, press CAL again, 3 is displayed…. 4. Press CAL and TARE alternately until 8 is displayed on the LCD. 5. Press ON/OFF, and then the balance displays 8888888. 6. Press TARE to display the balance type. Then press TARE again to display set values of internal parameters. 7. Press CAL to display the zero point count value. 8. By increasing or decreasing the balance weight, the zero point count value of the balance is OPTIMA SCALE MANUFACTURING INC. 3 close to 400 as much as possible and the zero point count value is between 350 and 450: (increase or decrease the weight on 8 fixed screws of the bracket or M4 screw holes in front of the column, so as to achieve the standard between 350 and 450). 9. Full load count value: load a 200g standard weight on the balance pan to observe the full scale count value. The full load count value is between 15200 and 15550. 10. If the full load count value is excluded in the above scope, an electric resistance box shall be connected at R25 so as to ensure the full load count value in the said scope through the parallel connection of relevant resistance. III. Check Counter Value: The no-load counter value scope is from 350 to 450. After the 200k weight is loaded, the full load count value shall be between 15200 and 15550. IV. Assembly: Components of the balance shall be assembled well according to the sequence opposite the disassembly sequence after checking. Chapter II: Balance Adjustment (4MM adjustment) When the balance is under the condition A and B, observe the change of the balance value. (Condition A means the balance is at the horizontal position, condition B means that a gasket 4mm thick is placed at the front bottom of the balance to increase the front height of the balance by 4mm), and then compare readings of the balance under the two conditions. 1. Roughly adjust the balance weight and keep the difference of values displayed under both condition A and B in the scope of ±80. If the value under the condition A is higher than the value under the condition B, the balance weight shall be decreased. On the country, the weight shall be increased. 2. During the adjustment, pay attention to adjusting properly and do not damage the force spring and pivot spring. When you tighten screws of the balance weight, hold the beam by hands and avoid moving the beam. 3. Adjust the balance weight slightly and keep the difference of values displayed under both condition A and B in the scope of ±30. 4. Check the count value again and make a fine adjustment after the balance adjustment is finished. OPTIMA SCALE MANUFACTURING INC. 4 Beam Balance weight assembly Gravity weight assembly Stopper Cross recess head screw M3x6 Flat washer 3 Chapter III: Position Error Adjustment 1. Use a 100g weight to adjust the position error after the balance is preheated for 40min. Check the value displayed at five positions of the balance, i.e. up, down, left, right and middle. Then, make a contrast with the value displayed in the middle. When the error is more than 0.2mg, make an adjustment with the following method: 2. On the basis of displayed position data and differences with data at the middle position, adjust position adjustment screws in the direction indicated by arrows in the picture above, until they meet the scope requirement. + d - + \ + - + d - - + d - + + d - - d + - d + - \ + + - d + + \ + - d + \ + -