Ecotech HiVol 3000

HiVol 3000 User Manual 1.7 Calibration
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4.1.2 Using the “Calibration Chart for Top Loading Orifice Plate”
To obtain the data required to calibrate the HiVol air sampler, refer to the
“Calibration Chart for Top Loading Orifice Plate”, supplied with the Orifice
Plate. This chart eliminates the need for calculations.
For the HiVol 3000, use only the chart that says “USE FOR AMBIENT
VOLUMETRIC FLOW DETERMINATION” in the top left corner. This
chart is single sided.
Note: Earlier charts were double sided and apply to mass
flow controlled HiVols such as the Model 2000. Do not use
this chart for the HiVol 3000. These charts refer to 0°C or
25°C REFERENCE TEMPERATURE in the top left corner.
Obtain the ambient air temperature, to the nearest 5°C using a reference
thermometer, and barometric pressure, to the nearest kPa (or 10 mbar) using a
reference barometric pressure sensor (barometer). The temperature and
barometric pressure displayed on the HiVol 3000 display should not be relied
upon for this purpose.
Locate the closest ambient temperature across the top edge of the chart, and
the closest barometric pressure down the left-hand side of the chart. Read
down and across to obtain the current calibration data where the two intersect.
An example is indicated with an “X” at 20°C and 96 kPa.
The data are in the format:
Display Flow
m
3
/hour
ΔH
mm H
2
O
ΔH
kPa
50 xxx x.xx
60 xxx x.xx
70 xxx x.xx
80 xxx x.xx
90 xxx x.xx
Display reading
on HiVol
Corresponding
Manometer
reading
Corresponding
Manometer
reading
(U-tube Water
Manometers)
(Digital
Manometers)