Calibration procedure for halogen moisture analyser

Calibration procedure for halogen moisture analyser

• OBJECTIVE
• To lay down the procedure for calibration of Halogen moisture analyser,
• SCOPE
• This SOP shall provide the calibration procedure of Halogen moisture analyser in in-process quality assurance department and quality control department.
• RESPONSIBILITY
• Officer/ Executive – Quality Control/Quality Assurance.
• ACCOUNTABILITY
• Head QC/QA

• PROCEDURE
• Precautions:
• Make  Metler – Toledo.

• Weight taken should be more than 0.5g and less than 20g.
• After drying as the pan and sample may still be hot, let these cool off before removing the pan from the sample holder.
• The air bubble level of the indicator should be in the center or else is adjusted by the screws provided at the bottom of the balance.
• Before starting the operation check for the area cleanliness and instrument cleanliness.
• Operate the instrument
• The Instrument is calibrated for following parameters
• a) Balance Calibration
• b) Moisture Content repeatability with five replicates
• c) Temperature
• Balance Calibration:
  
• Press “MENU” key and select calibration mode by pressing “ / ” keys.
• Press the <<Accept entry >> key (8 ) to start the balance calibration.
• The display flashes “50.000” g requesting to place 50.000g standard weight on the weighing pan.
• Place the 50.000g standard certified weight in the middle of the weighing pan. Instrument automatically calibrates itself and flashes 0.000 gm on display, indicating that the balance has been calibrated.
• The instrument stores the determined weight value and the display prompts to lift off the standard weight from the weighing pan.
• Remove the standard weight from the weighing pan and the displays “DONE”.
  
• Display returns back to the main screen.

• Now the balance is internally calibrated with external standard weight.
• Verify the calibration by placing the 50.0 g weight again on the pan and record the reading.

• The weight observed should fall with in the tolerance limit of 50.000 ± 0.01 g.
• Moisture Content Repeatability Test:
• Operate the instrument.
• Add 2 g Chemical substance “Disodium tartrate dihydrate” by distributing as evenly as possible on the sample pan.
• Press the temperature adjusting key. Set the temperature to 130.0°C by using the / keys.

• Set the time key to “3”, the factory setting.
  
• Close the heating module, the status displays which indicates the drying of the sample and the system will automatically start the drying and measuring process

• Record the moisture content observed.
• The test is carried out for five replicates and the RSD is calculated.
• Temperature Calibration:
• Temperature Calibration of the instrument is carried out by external agency at 100°C and 160°C using temperature adjustment set.

• After usage of the instrument, maintain the record in the user logbook.

• If the instrument does not meet the acceptance criteria, tag the instrument as “OUT OF CALIBRATION” and inform the service engineer and tag the instrument with “UNDER MAINTAINENCE”.

• Acceptance Criteria:
  

Calibration Parameter	Acceptance Criteria	Frequency
Balance Calibration	50.000g  ± 0.01g	Monthly and after any maintenance job
Moisture Content repeatability with five replicates.	Moisture Content = 15.66 ± 0.5 % RSD: NMT 0.3%	Monthly and after any maintenance job
Temperature	Two point calibration done by external agency for 100°C ± 2°C and 160± 2°C	Yearly and after any maintenance job

• Forms and Records (Annexures)
• Calibration format for Halogen Moisture Analyzer – Annexure-1

• Distribution
• Master copy –  Quality Assurance
• Controlled copies- Quality Assurance, Production, Quality Control.engineering
• History
  

  Date	Revision Number	Reason for Revision
  –	00	New SOP

Annexure-1

Calibration format for Halogen Moisture Analyzer 

Make

:

Instrument No.

:

Model

:

Calibration Date

:

Reference SOP No.

:

Next due date

:

Cleanliness of equipment / instrument before calibration:

1 . BALANCE CALIBRATION: Standard weight box ref.no:

S.No

Check weight

Standard Mass value

Displayed wt.

Limit

Remarks

1

50.000 g ± 0.01 g

2

2. MOISTURE CONTENT REPEATABILITY:  Standard Di Sodium Tartrate used ( B. No. / Lot No._______________________ )

S.No

Sample replicate number

Observed Moisture content

Results

Limit

Remarks

1

MEAN VALUE:

15.66 ± 0.5 % RSD: NMT 0.3%

2

3

STD.DEV:

4

5

RSD:

Temperature Calibration (by external agency):                   Temperature adjustment device ref.No  :

S.No

Set Temperature

Observed Temperature

Limit

Remarks

Instrument

Temp.adjust.device

1

100°C

98 – 102°C

2

160°C

158 – 162°C

CALIBRATION STATUS: COMPLIES / DOES NOT COMPLIES Calibrated by:                                   Checked by:                                                   Approved by: Date:                                                   Date:                                                              Date  :

 

 

 

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