• Gas cells: Electrochemical cells must be calibrated regularly and
replaced every 2 to 5 years for best performance. Please contact
DSTech for information on our calibration services.
• Do not pressurize the sensor: Never connect the ObservAir to a
compressed gas cylinder (even when fitted with a regulator), air
compressor, or other pressure source without a purge valve that is
open to the atmosphere. Positive pressure air in the sensor can
damage sensing elements and other hardware.
• Charger: Only charge the sensor with the included charger or
equivalent 2.1A rated USB charger. The included charger is rated for
operation at both 110V/60Hz and 220V/50 Hz – simply adapt to local
plug style if needed. Do not use chargers rated above 2.1A or below
2.0 A. The ObservAir can also be charged from computer ports that
are rated to at least 500mA.
• Accessories: Do not use third party accessories with the ObservAir,
such as external battery packs, solar panels, etc. without first
consulting DSTech Technical Support.
• Replacement parts: Only use replacement parts provided by DSTech
or an authorized DSTech distributor.
• Disassembly: Never disassemble the unit, this voids the warranty and
may result in permanent damage to the unit and/or harm to the user.
Please contact DSTech Technical Support at info@dstech.io regarding
any problems with your unit that cannot be resolved with the
instructions provided in this manual.
2.4. Data processing overview
For black carbon (BC) and gaseous pollutant monitoring, data goes
through processing in the order summarized below:
1. Raw signal acquisition: Digital voltage readings proportional to light
intensity (for BC) or electrical current (for gases). These raw signals
are always logged to the SD card and Cloud Dashboard unaltered,
such that users can calculate pollutant concentrations from scratch
using their own methods.
2. Environmental compensation: The voltage signals are compensated
for their environmental sensitivity, as outlined in Section 1.2.
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