Digital Weighing Balance, Purpose:
Digital Weighing Balance, To lay down the procedure for operation, accuracy check and cleaning of the weighing balances at the Production Area.
Digital Weighing Balance, Scope:
This SOP is applicable for 320 g & 60 Kg weighing balance for weighing of materials at the Production Area of XX Pharmaceuticals Ltd.
Definition / Abbreviation:
N/A.
Responsibilities:
[][]The Roles and Responsibilities are as follows:
Operator
[][]To follow the laid down procedure
Executive, Production
[][]To monitor and check the cleanliness of area
Manager, Production
[][]To implement this correctly
Manager, Quality Assurance
[][]To approve the Document
Procedure:
Precaution:
[][]Do not pour liquids on the weighing platform.
[][]Do not use solvents to clean the platform.
[][]Ensure balance is clean before use, including its surrounding area.
[][]Check and ensure the due date of calibration before use.
[][]Check and ensure the level indicator of weighing balance is in the middle, if applicable.
[][]Use hand gloves to hold standard weights for function check and calibration.
Daily Performance Check :
[][]Plug in the power cord.
[][]Level the balance using leveling feet so that air bubble is centered within circle of level indicator.
[][]TO turn the balance ON, short pressing the <O/T> key.
[][]Wait a while so that the stability indicator [*] is displayed.
[][]Zero the balance by pressing the >O/T> key.
[][]Press the 100 mg mass at the centre of the platform and record the value displayed in the daily balance check logbook.
[][]Press the 100 g mass at the centre of the platform and record the value displayed.
[][]Press the 200 g mass at the centre of the platform and record the value displayed.
[][]Print the results by pressing print ( ) button if necessary.
[][]Record the value of those weights in Log Book for ‘Daily Accuracy Check’ (Annexure – I).
[][]If any displayed value is out of acceptable limit, label the balance “DO Not Use” and inform the QA Executive for immediate calibration of the balance.
[][]Balance accuracy check must be performed at the starting of the day.
[][]If the factory remains close for the day(s), put the comments in the remarks column against that day(s) at the day of factory resume.
Operation of 320 g Balances of Mettler Toledo :
To start up:
[][]Level and adjust at each time it is moved to a new location. The balance is exactly horizontal when the air bubble is in the middle of the level glass. Adjust the two front leveling feet appropriately until the air bubble comes to rest exactly in the middle of the glass.
[][]Plug the AC adapter and connect the power supply. Connect the printer to the balance (if available).
[][]Switch on the printer using I/O switch.
[][]Press On/Off ( ) button to on the Electric Analytical Balance. Display will show 0.000g.
[][]Convert the weighing unit from g into mg, press scroll down ( ) button if necessary.
[][]Allow the balance to warm up to enable it to adapt itself to the ambient condition.
[][]Long press for menu ( ) button and select ‘BASIC’ by single press Enter button ( ).
[][]Set date, time and unit using – /+ keys and Enter button ( ) and save the settings using ( ) button.
[][]Press cancel (C) button to return come out of that ‘BASIC’ option and return to its main menu.
[][]Perform the ‘Daily Accuracy Check’ (Annexure – I) at the starting of the day.
Weighing:
[][]Check the machine is clean and calibrated. Then remove all loads from weighing pan.
[][]When zero (0.000 g) reading is displayed, the balance is ready for operation. If the display shows greater than or less than zero, press tare ( O/T ) button to tare the balance.
[][]If the balance is not in the weighing mode, press and hold the ( ) key down until ‘WEIGHING’ in the display.
[][]Use handle/coupling element for the operation of the draft shield door of the both side of the instrument.
[][]Open right/left/upper sliding window of the instrument.
[][]Place empty container/weighing paper on the pan of the balance. Close the sliding window.
[][]The weight is displayed. Allow the reading to stabilize and wait until the instability detector (O) disappears from the left side of the display and the stability beep sounds.
[][]Press tare ( O/T ) button to tare the balance. When zero (0.000 g) reading is displayed, the balance is ready for weighing.
[][]The weighing-in aid is a dynamic graphic indicator which shows the used amount of the total weighing range. It can be recognized at a glance when the load on the balance approaches the maximum load.
[][]Add weighing sample (Maximum 320g) on the container/weighing paper using weighing spoon. Close the sliding window. The net weight is now displayed.
[][]Allow the reading to stabilize and wait until the instability detector (O) disappears for the display and the stability beep sounds.
[][]To get printout of the weight, press print ( ) button.
[][]For performing another weighing press tare ( O/T ) button to tare the balance and follow steps from previous steps To increase or decrease digit, press display resolution ( ) button.
[][]Finally, press and hold On/Off button ( ) button until ‘SHUT OFF’ shows on the display.
Calibration:
Internal Calibration:
[][]Manual Adjustment with Internal weight:
[][]Long press menu ( ) button and press scroll down ( ) button to go to ‘ADVANCED’ option.
[][]Select ‘ADVANCED’ by pressing Enter ( ) button.
[][]Press scroll down ( ) button once to select ‘CAL’ option by pressing Enter ( ) button.
[][]Then select ‘ADJ. INT’ using scroll down ( ) button and then press Enter ( ) button.
[][]Press cancel (C) twice and save the settings if required by scrolling down ( ) button and press Enter ( ) button and then return to its main menu.
[][]Unload weighing pan Press and hold calibration ( ) button to execute ‘Internal Adjustment’.
[][]The balance adjusts itself automatically. The adjusting is finished when the message “ADJ.DONE” appears briefly on the display. The balance returns to the last active application and is ready for operation.
[][]After adjustment, the result of the calibration will be printed out automatically or press print ( ) button for print copy.
External Calibration:
[][]Manual Adjustment with External weight:
[][]Follow the instruction from previous steps
[][]Select ‘ADJ. EXT’ by using scroll down ( ) and then press Enter ( ) button.
[][]Set the adjustment weight (100g) by using -/+ key for External Calibration and press Enter ( ) button.
[][]Then press cancel (C) button twice and save the settings if required by using -/+ key and press Enter ( ) button and then return to its main menu.
[][]Unload weighing pan Press and hold calibration ( ) button to execute ‘External Adjustment’.
[][]The required predefined adjustment weight value flashes on the display.
[][]Place adjustment certified weight on the center of pan. The balance adjusts itself automatically.
[][]When ‘0.00 g’ flashes, remove the adjustment weight.
[][]The adjustment is finished when the message ‘ADJ DONE’ appears briefly on the display. The balance returns to the last active application and is ready for operation.
[][]After adjustment, the result of the calibration will be printed out automatically or press print ( ) button for print copy.
Operation of 60 kg Balances of Mettler Toledo:
[][]Using an Empty container for Weighing:
[][]Press the zero button.
[][]Place an empty container on the scale platform.
[][]Press the Tare button.
[][]Fill the container with material to be weighed.
[][]The terminal will display the net weight and the NET cursor will light up. Allow the reading to be stable. Write down the reading.
[][]To clear a tare weight (with the scale in the net weight mode and a tare weight previously entered), press the Clear key (C).
Without using an Empty container for Weighing:
[][]Press the zero button.
[][]Place the material to be weighed on the scale platform.
[][]The terminal will display the net weight and the NET cursor will light up. Allow the reading to be stable. Write down the reading.
[][]Perform the ‘Daily Accuracy Check’ (Annexure – I) at the starting of the day.
Acceptance Criteria:
[][]The observed weights should be within ± 0.1% of the certified standard weights.
[][]If the acceptance criteria are not satisfied, follow the procedure for Handling of out of calibration for instrument & equipment.
Calibration:
[][]Perform the routine calibration half year. Recalibration is required in the following cases :
[][]After any minor service has been done or replacement of parts.
[][]When the software or firmware has been upgraded or changed.
[][]If daily check fails
Cleaning:
[][]Place the status label ‘TO BE CLEANED’ on the equipment.
[][]Switch off the balance and unplug from the socket.
[][]Remove all objects from the weighing platform of balance.
[][]Lift up and remove the weighing pan in such a way that there is no damage in weighing system.
[][]Clean the pan including underside using a piece of dry cloth. Use wet cloth and finally clean with disinfection solution
[][]Wipe the display, switch board and cables with dry cloth.
[][]Remove ‘TO BE CLEANED’ and affix ‘CLEANED’ label on the equipment after approval from Quality Compliance.
[][]Record the cleaning parameters on the ‘Equipment Log Book’
Annexure: Digital Weighing Balance
Annexure I – Daily Accuracy Check.