Follow
1.0 OBJECTIVE:
1.1 To lay down a procedure for Calibration of Checkweigher.
2.0 SCOPE:
2.1 This procedure is applicable for Calibration of Checkweigher in production department.
3.0 RESPONSIBILITY:
3.1 Technical Associate : Cleaning of Check weigher
3.2 Officer/ Executive Production : Supervision and calibration of check weigher
3.3 IPQA : SOP Verification
4.0 Head Production : SOP Compliance
5.0 PROCEDURE:
5.1 Caution
5.1.1 Ensure that the Checkweigher is free from dust.
5.1.2 Ensure that Checkweigher is installed on firm support.
5.1.3 Ensure that Checkweigher platform is not touching to any surface.
5.1.4 Do not keep the Checkweigher platform loaded in the “OFF” condition.
5.1.5 Check for the proper earthing of the Checkweigher wherever available.
5.1.6 Avoid impact/mechanical shocks to the Checkweigher.
5.2 Zero Error Checking:
5.2.1 Note: Zero error of the Checkweigher must be checked before use to avoid erroneous weights. The errors may be due to:
5.2.1.1 The Checkweigher not being in level as per the sprit bulb.
5.2.1.2 The mechanical or electrical defect.
5.2.1.2 The platform not being cleaned.
5.2.1.3 Some extraneous matter hampering the smooth operation of the platform.
5.2.1.4 Check the sprit level and record the same in its respective annexure. Rectify it if necessary.(If sprit level is not provided on the Checkweigher, use portable sprit level and check the level by keeping it on the platform. If not in order correct it by adjusting the base-mounting pad.)
5.2.1.5 Put “ON” the Checkweigher.
5.2.1.6 Check for the “ZERO” display and record the same in respective annexure.
5.2.1.7 If there is any error, rectify and record the same.
5.3 Frequency:
A) (a) Daily in morning.
B) (b) After any maintenance.
C) (c) After resuming of the power.
D) (d) Relocation of Checkweigher.
5.4 CALIBRATION:
5.4.1 Daily Calibration
5.4.1.1 Check the cleanliness of the Checkweigher.
5.4.1.2 Check Zero error as per step 5.2.
5.4.1.3 Get the fractional weight box or trolley of standard weights (which ever is required. Ensure that the standard weights are duly calibrated.
5.4.1.4 Calibrate the Checkweigher with 1% and 50% of its capacity and record in the respective annexure-I(Checkweigher Daily Calibration Record)PG/076/F2/01.
5.4.1.5 Place the weights in the center of the Checkweigher platform. Keep the weights in ascending order. Check the observations for the variation (if any) and record the same in its respective Daily Calibration format .
5.4.1.6 Tolerance: The variation should be + least count of the Checkweigher or + 0.1% of the standard weights used whichever is higher.
5.4.1.7 If the variation does not found within the limit put the “OUT OF CALIBRATION” label and follow the step no. 5.6
5.4.1.8 Frequency:
a) Daily in morning.
b) After the resuming of the power after power failure.
5.5 Full Scale Calibration:
5.5.1 Check the Zero error as per step No.5.2
5.5.2 Get the fractional weight box or trolley of standard weights (whichever is required. Ensure that the standard weights are duly calibrated.
5.5.3 Calibrate the Checkweigher with 1%, 20%, 50% and 80% of its capacity and record in the respective annexure-II(Checkweigher Monthly Calibration Record) .
5.5.4 Place the weights in the center of the Checkweigher platform. Keep the weights in ascending order. Check the observations for the variation (if any) and record the same in Annexure-II(Checkweigher Monthly Calibration Record).
5.5.5 Tolerance: The variation should be + least count of the Checkweigher or + 0.1% of the standard weights used whichever is higher.
If the variation found with in the limit then dully filled the affixed calibration label.
If the variation does not found with in the limit .put the “OUT OF CALIBRATION” label and
follow the step 5.6.
5.5.6 Frequency:
a) Monthly.
b) After any maintenance.
5.6 MAINTENANCE:
5.6.1 If the Checkweigher is out of calibration inform to concerned service agency for rectification.
5.6.2 After rectification recalibrate the Checkweigher (Full scale Calibration).
5.6.3 All the records relating to servicing and calibration to be maintained.
6.0 ABBREVIATION (S):
6.1 SOP: Standard Operating Procedure
6.2 g : gram
6.3 wt: Weight
REFERENCES (S): SOP: Status labeling
