Velocity Meter Calibration SOP

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:

Revision No.	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 Calibration date Date of last calibration done Next due for calibration Instrument details Instrument name Instrument make Instrument identification No. Observation Chart Sr. # Sampling frequency Stability Air density Remarks Conclusion: Satisfactory/ Not satisfactory. Done by/date Checked by/date

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