Velocity Meter Operational SOP

To lay down the operating procedure of Velocity meter.
2.0  SCOPE:
This shall be applicable to the Velocity meter of Quality Control Instrument Laboratory.
3.1  Technical Assistant/ Helper.
3.2  Q.C Analyst.
4.1  Manager-Quality Control.
5.1  Velocity meter.
5.2  Sample.
6.1  Measuring air velocity:
6.1.1        Press the POWER button to turn the meter on. The full display appears briefly.
6.1.2        The unit is ready for use when "vel" (velocity) and the ambient temperature are displayed.
6.1.3        Place the unit in front of the air source. The measurement is displayed.
6.1.4        Press the SCALE button to switch units of measure: ft/m, mile/hr, or knots in the US mode, and m/s, km/hr, or knots in the metric mode.
6.1.5        For measuring air velocity in difficult to reach areas, press the HOLD button during the reading. This "freezes" the measurement on the display. Press the HOLD button again to exit this feature.
6.2  Continuous moving average:
6.2.1        Press the POWER button to turn the meter on.
6.2.2        Place the unit in front of the air source.
6.2.3        Press the MAX/MIN button. The LCD displays "AVG" and the moving average, with updates every second.
6.3  Max/Min/Average (Single point):
6.3.1        Press the POWER button to turn the meter on.
6.3.2        Place the unit in front of the air source.
6.3.3        Press the MAX/MIN button to record the readings.
6.3.4        Press the HOLD button before moving the meter away from the air source.
6.3.5        Press the MAX/MIN button twice to display the minimum velocity. "MIN" is displayed.
6.3.6        Press the MAX/MIN button again to display the maximum velocity. "MAX" is displayed.
6.3.7        Press the MAX/MIN button again to display the average velocity. "AVG" is displayed.
6.3.8        To clear the readings, either turn off the unit or press the MAX/MIN button until the unit beeps twice.
6.4  Air velocity average (Multi-point):
6.4.1        Press the POWER button to turn the meter on.
6.4.2        Place the unit at the first point to be measured.
6.4.3        Press the HOLD button to store the first measurement. The unit will beep once and display "HOLD."
6.4.4        Press the MAX/MIN button. The unit will beep once and a digit from the one to eight will be displayed. This represents the point being recorded. Repeat the process up to eight times.
6.4.5        Once all measurements have been recorded, press the AVERAGE button to display the average air velocity and the number of points measured.
6.5  Default settings:
6.5.1        Turn on the meter by pressing both the POWER and the AVERAGE buttons.
6.5.2        Release the POWER button first. Release the AVERAGE button when "Ft/min" "M/s" "°F" and "°C" appear on the LCD.
6.5.3        Either "Ft/m" and "°F" or "M/s" and "°C" will be displayed. To switch modes, press the HOLD button for metric, or the AVERAGE button for US settings.
6.5.4        Save the setting by pressing the MAX/MIN button. "S" will display.
6.5.5        Press the HOLD button to continue to the baud rate selection.
6.5.6        Set the baud rate required by your software's instructions. For 840052, make sure that the software and the meter are both set to 2400 baud rate.
6.5.7        Press the AVERAGE button to select 2400, or the HOLD button for 1200.
6.5.8        To save the settings, press the MAX/MIN button. When "S" is displayed, press the HOLD button to exit this function.
6.6  USB connection:
6.6.1        Plug the 3.5mm cable jack into the meter's USB output and the 9-pin connector into the computer’s COM port. Press the POWER button to turn the meter on.
6.7  Automatic shut off:
6.7.1        After about 15 minutes without activity, the meter will beep 3 times then shut off to preserve battery life. To disable:  With the unit turned off, simultaneously press the POWER and HOLD buttons.  Release the POWER button.  When "n" displays, release the HOLD button. The meter will remain on until the POWER button is pressed again.
6.8  Battery replacement:
6.8.1        Replace the 9V battery when "LOW BATTERY" is displayed. In-spec measurements may be made for several hours after the low battery indicator appears.
6.9  Precautions:
6.9.1  DO NOT use the meter in air velocities that exceed the specified range.
6.9.2  DO NOT use the meter at or near hurricane wind velocities.
6.9.3  DO NOT use the meter in air that exceed the operating temperature range.

Revision No.
Effective Date


8.1  Not Applicable.
Annexure 1: Panel description

Annexure: 1
Panel description

Expanded Form
Standard operating procedure
Quality control
Quality control equipment operation

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