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MRK-D-0048 V4
Aeroqual Dust Sentry / AQS User Guide
Page | 48
7 Calibration
NOTE: A calibration record is supplied with the monitor, additional copies can be requested by
7.1 Gas module calibration
There are three types of calibration of the gas module:
1.
Factory calibration pre-shipment
. All gas modules are calibrated and must meet rigorous
performance standards before being shipped. This is captured by the factory calibration
certificate. Experience shows that Aeroqual’s factory calibration transfers well to the field,
meaning that field calibration is not required during initial set up.
2.
Field calibration
. The monitor is designed so that the gas module can be calibrated in the
monitor in the field. The field calibration set up and process is very similar to calibration of US /
EU EPA appr
oved ‘reference’ analyzers.
Field calibration is only recommended when:
a) the gas module is clearly operating out of specification and the appropriate trouble-
shooting steps have been taken, or;
b) periodical validation of the data is required (recommended for advanced users only).
3.
Factory calibration post-shipment.
At any time the gas module can be removed from the
monitor and returned to the factory or one of our authorised service providers for factory
calibration. If the gas module has not been field calibrated then it is recommended to have the
gas module factory calibrated every 12 months
The following instructions relate to field calibration only.
Field calibration is an activity that requires attention to detail and accuracy. You should read this
entire calibration section and understand it before starting, even if you are an experienced
practitioner.
The monitor is calibrated using a two-point calibration procedure, first by delivering zero air to
the monitor inlet and adjusting the offset, and then delivering span gas to the monitor inlet and
adjusting the gain.
Aeroqual provides all of the equipment required to perform field calibration. Aeroqual offers a
portable calibrator called the AirCal 1000.
Offset and gain adjustments are performed using the software tools provided by Aeroqual
Connect or Aeroqual Cloud.
If the AirCal 1000 is being used, there is a separate PC desktop software application which
can be downloaded from the website.
Some important considerations for field calibration
:
Gas module calibration is achieved using certified calibration gas and a gas dilution calibrator.
For ozone, an ozone generator, (ozone calibrator) must be used, Aeroqual recommends the
2B Tech Ozone generator part number AQM O3CAL.
Aeroqual does not recommend calibration when first commissioning a new monitor. We
recommend first calibrating 1-3 months after commissioning.
The quality of the calibration gas makes a big difference to success of a calibration, only
purchase calibration gas from a reputable calibration gas supplier.
The monitor must be in a stable condition before calibration can be attempted. The monitor
must have been running for at least 6 hours before calibration, ideally 24 hours.
The zero calibration step takes approximately 30 minutes total across all modules. The span
calibration takes approximately 30 minutes per-module. Therefore a monitor with 2 gas
modules will take 30 + (2 *30) minutes (approximately 1.5 hours) to calibrate.
Record keeping is a crucial part of calibration, the journal feature in Connect and Cloud is
where calibration record keeping is performed.
Calibration is discussed in detail in the online training. Several supporting videos are also available.
Online reference
training.aeroqual.com Dust Sentry Technical Training Section 5
Online video