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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