Ecotech HiVol 3000

HiVol 3000 User Manual 1.7 Calibration
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Warning
Do no place any objects on or in the circular hole on the top of
the orifice plate. Any blockage can cause damage to the
instrument and void warranty
Calibration ensures that the values of various parameters indicated by the
digital display (flow rate, temperature and barometric pressure) are
representative of the true or actual flow rate through the sampler, and ambient
temperature and pressure conditions. To comply with Australian or U.S. EPA
standards, regular flow rate calibration is required. The HiVol 3000 also has
built-in temperature and barometric pressure sensors. Ambient temperature
and barometric pressure calibration should also be carried out at regular
intervals, which should form part of Quality Assurance procedures, along with
other regular maintenance items.
A sample Field Calibration Record is included at the end of this manual.
4.1 Flow Rate Calibration
Note: Calibration of the HiVol samplers air flow rate measuring
device shall be performed by the user after installation at a new
site, following a site change, after significant maintenance or
repair and in any event at intervals not exceeding two months, or
as required by the regulatory authority.
The HiVol flow rate calibration is performed using a flow rate transfer
standard, which mounts on top of the filter cassette. Flow rate transfer
standards are typically top-loading Orifice Plates (as shown in Figure 19), or
electronic mass flow meters.
One simple method of calibrating the sampler is to use the optional Top-
loading Orifice Plate (Part number: P-ECO-HVS3000-21) (Figure 19). This
unit is specifically designed for the Ecotech HiVol samplers and each orifice
plate has been calibrated against a certified reference standard. A manometer
(water filled U-tube or digital) is connected to the orifice plate and gives a
pressure drop across the orifice which is related to volumetric flow rate.
Note: The flow rate transfer standard (Orifice plate) must itself
be calibrated against a traceable flow standard. According to
Australian Standards, this should be done at least every 10
years, or sooner if damage or wear occurs. For top-loading
orifice plates a roots-meter is commonly used for this primary
calibration. Contact Ecotech for further details. It is imperative to
take special care of the Orifice Plate and to inspect for damage
before each use.