Digital Melting point apparatus Operational SOP



1.0  OBJECTIVE:
To lay down the operating procedure of Melting point apparatus.
2.0  SCOPE:
This shall be applicable to the Melting point apparatus of Quality Control Instrument Laboratory.
3.0  RESPONSIBILITY:
3.1  Technical Assistant/ Helper.
3.2  Q.C Analyst.
4.0  ACCOUNTABILITY:
4.1  Manager-Quality Control.
5.0  MATERIAL AND EQUIPMENT:
5.1  Melting point apparatus.
5.2  Sample.
6.0  PROCEDURE:
6.1  Operation:
6.1.1        Keep the “Heater” & “Stirrer” knobs to ‘MIN’.
6.1.2        Switch ON the main power supply.
6.1.3        Switch ON the mains of instrument.
6.1.4        The display will show some random figure, then press the ‘RESET’ push button to display the actual temperature of the furnace.
6.1.5        Keep the melting point tube in silicone oil containing glass container. Check through the lens type mirror about the capillary is correctly seated in its cavity.
6.1.6        Turn the STIRRER knob slowly towards MAX. Press the START push button.
6.1.7        Turn the heater knob to MAX and put HEATER HIGH/LOW switch to HIGH. (This switch is provided on right hand side of the instrument). The raise of temperature can be controlled by using this switch and the HEATER knob.
6.1.8        When the temperature reaches within about 30oC, of the expected melting point, reduce the rate of heating and adjust the rate of rise of temperature to about 1oC, per minute.
6.1.9        Wait till the melting point is reached which is indicated by sample is melted in the tube. The digital read-out will display the exact temperature at which the sample is melted. Record this temperature. Turn off the ’HEATER’ Knob. 
6.1.10    After reducing the temperature, switched off the instrument.
6.2  Precautions:
6.2.1        Care should be taken while inserting the capillary into its cavity or taking out from the cavity to avoid breaking, take it out vertically.
6.2.2        Check always colour of the silicone oil. Normally it is colourless. If it observed as yellow or brown, discard the oil. And take fresh oil in that container.
7.0  REVISION LOG:
Revision No.
Effective Date
Reason
00

New SOP

8.0  REFERENCES:
8.1  Not Applicable.
9.0  ANNEXURES:
9.1  Not Applicable.
10.0    ABBREVIATIONS:
Abbreviation
Expanded Form
SOP
Standard operating procedure
&
And
No.
Number  
Ltd.
Limited
Q.C
Quality control
QCEO
Quality control equipment operation
F
Format
oC
Degree centigrade


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