Operation and calibration of Moisture Meter

1. Objective

To lay down a procedure for Operation and calibration of Moisture Meter.

• Scope

This SOP is applicable for Operation and calibration of Moisture Meter in Quality Control.  

• Responsibility

QC Chemist    : Follow the procedure and maintain record as applicable.

• Accountability

Head Quality Control  : System Compliance

• Procedure
  • Operation:      
    • Set rotator knob to position 2.
    • Insert pins in the box in level position without shaking.
    • Insert pins in the box at three/ four places at different spots.
    • The moisture contents reading display will show on the screen.
    • Measuring range of moisture meter is 0% to 90%.
    • Enter the details in Instrument log.
  • Calibration
    • Place the pins of the Moisture meter across the two screws on the Moisture Calibrator (moisture calibrator shall be calibrated from outside Agency).
    • The knob should be kept in position 2.
    • Reading should be 12.0%±0.5%.
    • Fill the details in Annexure-I.
    • If there is any deviation in the reading, then adjust the instrument by removing the 2 screws provided on the display and then remove the cover , you can find a small calibration screw .
    • Adjust this Trimpot, so that the display reads 12.0%±0.5%.
    • Prepare the calibration tag and affix it on the equipment.
    • Attach the old calibration tag with the old calibration record and do not throw it.
    • Frequency: Yearly ±30 days.
  • Precautions:
    • Do not apply the extra force above the capacity. Otherwise the meter may be damaged.
    • Do not hit or put weight on the LED.
    • Do not press button with pointed tools, nails or speculated tools.
    • Clear the dirt and dust with soft cloth. Do not use volatile liquid to clean the meter. If there is something wrong with it, contact with service engineer.
    • After use place the moisture meter in the screw type box.
  • If the variation is not within the specified tolerance limits:
    •  Label the equipment with a tag, “OUT OF CALIBRATION”.
    •  Inform the Department Head.
• Annexure (S)

            Annexure-I      : Calibration record of Moisture Meter.

• Reference (S)
•  NA

• Glossary

SOP                            :  Standard Operating Procedure

QC                              :  Quality Control

QA                               :  Quality Assurance

No.                              :  Number

%                                 :  Percentage

• Revision History

Rev. No.	Details of changes	Reason for change