1.0 OBJECTIVE:
To
lay down the calibration procedure of Velocity meter for reliable and accurate results during mixing.
2.0 SCOPE:
This
shall be applicable to the Velocity
meter 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
Velocity meter.
6.0 PROCEDURE:
6.1 Clean
the apparatus according to the SOP.
6.2 Operate the apparatus according to the SOP.
6.3 Run
for 5 minutes before calibration procedure begins in order to avoid the effect
that large temperature variations many have on the mechanical friction of the
anemometer bearings.
6.4 Calibration
shall be performed under both rising and falling wind speed in the range of 4
to 16 m/sec at a calibration interval of
1m/s or less.
6.5 By
taking readings both for increasing steps and for decreasing steps, it is
possible to identify whether hysteresis effects are present in the measuring
equipment. (Note: 1 m/s intervals can also be realized with the allowance for 2
m/s jumps, e.g. 4, 6, 8, 10, 12, 14, 16, 15, 13, 11, 9, 7, 5 m/s).
6.6 The
sampling frequency shall be at least 1 Hz and the sampling interval 30
sec. This time shall be increased when low resolution anemometers are
calibrated. It is important to ensure that anemometer and reference wind speed
readings span the same period of time. Before collecting data at each wind
speed, adequate time shall be allowed for stable flow conditions to become
established. This will typically take 1 minute, but will vary from facility to
facility.
6.7 Stability can be assumed if two
successive 30 second means are within 0.05 m/s of each other.
6.8 Air density shall be calculated based
on the mean wind tunnel air temperature T (0K), humidity and barometric
pressure B (Pa).
6.9 Note
down values in annexure-1.
7.0 REVISION LOG:
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Revision No.
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Effective Date
|
Reason
|
|
00
|
|
New
SOP
|
8.0 REFERENCES:
8.1 Not Applicable.
9.0 ANNEXURES:
Annexure 1: Calibration
report of Velocity meter.
Annexure:
1
Calibration
report of Velocity meter
|
Calibration
report of Velocity meter
Observation Chart
Conclusion:
Satisfactory/ Not satisfactory.
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10.0
ABBREVIATIONS:
|
Abbreviation
|
Expanded Form
|
|
SOP
|
Standard operating
procedure
|
|
&
|
And
|
|
No.
|
Number
|
|
Ltd.
|
Limited
|
|
Q.C
|
Quality control
|
|
Q.A
|
Quality assurance
|
|
QCEB
|
Quality control
equipment calibration
|
|
F
|
Format
|