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SOP for Checkweigher

Standard operating procedure of Checkweigher used in the packing area.


To lay down the procedure for the operation of checkweigher.


This SOP shall be applicable for the operation of checkweigher in the packing area.


3.1 Execution: Operator
3.2 Checking: Production Pharmacist & Above


HOD-Production/ Assigned Designee


5.1 Ensure that checkweigher is cleaned.
5.2 Production person shall ensure the cleanliness of the checkweigher & area and ‘CLEANED’ label on it.
5.3 Before starting the operation production person get the line clearance from Q.A person by writing the status label with Product Name, Batch Details to equipment & area.
5.4 Check calibration status of checkweigher.
5.5 Put ON the main switch.
5.6 Open the valve of compressed air and keep the air pressure not less than 4.0 - 6.0 kg / cm2.
5.7 Switch ON the mains of HMI. Screen will display as
BATCH No. # 00
NET WEIGHT # 0000.0 G.
UW # 000000
AVERAGE   (X) # 0000.0 G.
OK # 000000
OW # 000000
TARGET # 0000.0
+ Limit # 00.0 g.
- Limit # 00.0 g.
5.8 To enter new program or edit existing program, press Setup – 1 key. Screen will display
1. Select product
2. View / Edit product data
3. Dynamic compensation
4. Calibration
5. Set password
6. Set date / time

5.9 Calibration of checkweigher

5.9.1 Put on the checkweigher.
5.9.2 Press the calibration screen will display as
5.9.3 After entering the password confirm that weighing platform is empty and then press enter to continue.
5.9.4 Display screen will show “WAIT”.
5.9.5 Put standard weight of 1.0 kg on weighing platform and then press enter to continue.
5.9.6 Screen should display 1000.0 gm (Acceptance criteria: 999.0 - 1001.0 gm).
5.9.7 If screen display is within limit, carry out further calibration, if not calibrate with 1000 gm.
5.9.8 Switch ON/OFF checkweigher, calibrate with 10, 20, 50,100, 200,500 & 800 gram & record it in format.
5.9.9 Affix “If results are not within Acceptance criteria limit, affix “OUT OF ORDER” label and inform to maintenance.

5.10 Operation

5.10.1 By default, cursor will be on 1. Select product. Press enter key to retrieve list of products.
5.10.2 Select the required product using ( ↓ ) arrow key and press enter.
5.10.3 Product details of the selected product will be displayed on the screen. In case, changes are to be made in the stored data, select the details and enter. Screen will display as: “ENTER PASSWORD”
5.10.4 Feed the required details and press enter key. For entering further data, if any use ( ↓ ) arrow key feed the data and press enter to save the changes made.
5.10.5 Press weight display key to view the screen as shown under procedure number 5.8.
5.10.6 Press weight display screen it will show the weight of individual carton.
5.10.7 Underweight and overweight, cartons are rejected by checkweigher in the rejection box.
5.10.8 Handle the checkweigher rejected cartons and record in BPR when required.
5.10.9 On completion of work, switch OFF HMI, main power supply and close valve of compressed air.

5.11 Challenge Test

Challenge test of checkweigher equipment as follow.
a) Take one carton, remove the one strip/blister or leaflet then put this carton on conveyor belt of check Weigher machine which should be rejected by checkweigher system.
b) Take one carton, add the one strip / blister or leaflet then put this carton on conveyor belt of Checkweigher machine which should be rejected by checkweigher system.
Note: Whenever the checkweigher is shifted from one packaging line to another,
a) Check the spirit level or ensure that the air bubble of the spirit level is at center.
b) Verify the checkweigher as per the calibration schedule. Record the details of verification in Checkweigher Calibration Record in format.
a) Don’t keep weighing conveyor load with weight
b) Stop conveyor and set to zero by pressing “set zero” key, if required


6.1 SOP: Standard Operating Procedure
6.2 BPR: Batch Packing Record
6.3 Q.A.: Quality Assurance
6.4 HOD: Head of The Department
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