STANDARD OPERATING PROCEDURE LAB EQUIPMENT – KINEMATIC VISCOMETER (KV) (CONSTANT TEMPERATURE KV BATH & GLASS TUBE VISCOMETER)
STANDARD
OPERATING PROCEDURE
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SUBJECT :
LAB EQUIPMENT –
KINEMATIC VISCOMETER (KV)
(CONSTANT TEMPERATURE KV BATH & GLASS TUBE
VISCOMETER)
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DEPARTMENT : QA
SOP
NO. :
Page
No :
Effective
Date :
Next
Review :
SOP
REVISION :
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1.0
OBJECTIVE:
To provide guidelines for Operation & Maintenance
of Constant Temperature KV Bath.
2.0 POLICY:
To establish a procedure for an operation of Constant Temperature KV Bath is used
to maintain the correct the constant Temperature for estimating kinematic
viscosity of oils.
3.0 PROCEDURE:
3.1. Switch ON the mains
3.2. Temperature
controller gets ON & stirrer motor starts to run continuously.
3.3 Upper display reads PV-present temperature in
tank & lower display reads SV Set temperature.
3.4. To
change set temperature, press the up/down key to increase / decrease
temperature. Ensure that the lower display is set to desired temperature.
3.5. Now the
temperature in the liquid starts to rise the Set Temperature.
3.6. Once the Set temperature is reached
the controller cycles the heater ON / OFF (Indicated in the front panel as
CONTROL) to control the temperature at the set point, at the given accuracy.
3.7 An
additional heater is provided in the bath (Indicted in the front panel as
BOOST) to raise the bath temperature quicker. This will go OFF when the bath
temperature is 10C/20C below SET temperature.
3.8 A high
temperature safety cut off is provided (indicated in the front panel as HIGH
TEMP/TEMP. HIGH) to break the supply to heater while overshoot of temperature
in the bath beyond the SET temperature or during mal functioning.
3.9. It may take 15-30 minutes to stabilize
at the set temperature.
3.10. A built
in lighting attachment is provided with a switch in the front panel to view the
viscometers.
3.11. The
following precautions must been taken to operate the equipment.
3.12. Never
switch ON equipment without appropriate medium in required volume being present
in tank.
3.13. Use only
specified liquids as medium.
3.14. Special
care is to be taken to use contamination-free liquids, especially at higher
temperatures
(beyond 2000C).
3.15. in
refrigerated equipments, never switch on refrigeration system unless liquid
temperature is below 400C Else, dangerously high pressures are
likely to build up in the refrigeration system.
3.16. To
perform the viscosities follow the following procedure.
3.17. Use
CF-150 viscometer tube for heavy liquids like (Blend Mineral Oil and CF-100 for
light samples like finished product.
3.18. Take
sample and poor into the viscometer through the non capillary side
3.19. Place
the viscometer in to the water bath and leave it for 15 minutes to attain the
temperature required for the test.
3.20. Then
with the help of a rubber bulb on the capillary side suck the liquid sample up
to the upper mark and adjust level of liquid meniscus to the marked level with
thumb. Remove the thumb after adjustment.
3.21. Let the
sample starts flowing and simultaneously starts the “stopwatch” till the sample
cross the lower mark of the tube. Record the time required for the liquid to
move from the upper to the lower mark of the tube. Stop the stopwatch and
record the time required
3.22. Observe
the temperature of water in the water bath with the help of thermometer for
confirmation of set temperature.
3.23. Calculate
Kinematic Viscosity by the following formula (KV)
KV =
Total no. of seconds (t) X viscometer constant (As per the calibration
certificate)
Where
t= Time required for the liquid to move from upper mark of the viscometer to
the lower mark.
3.24. The
sample passes the test if the Kinematic viscosity is within the specified
limits.
4.0 FREQUENCY:
As and when required.
5.0 RESPONSIBILITY: QA
Executive
6.0 REVIEW
GUIDE: ------
7.0 ANNEXURE:
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8.0 SOPs
DISTRIBUTION:
This
SOP shall be distributed to following Departments:
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Name of the Department
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Master Copy
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Circulatory Copy
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QA/QC
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Production
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Warehouse
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General
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Maintenance
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