• Use the device only to detect gases/vapors for which a sensor is installed.
Failure to follow these warnings can result in serious personal injury or death.
Many environmental factors may affect the sensor readings, including changes in atmospheric pressure, humidity and
temperature. Pressure and humidity changes also affect the amount of oxygen present in the atmosphere.
Pressure
If pressure changes rapidly (e.g., stepping through airlock), the oxygen sensor reading may temporarily shift and possibly
cause the device to go into alarm. While the percentage of oxygen may remain at or near 20.8 Vol %, the total amount of
oxygen present in the atmosphere available for respiration may become a hazard if the overall pressure is reduced by a
significant degree.
It is recommended that an oxygen calibration be performed at the temperature and pressure of use. Ensure that the device
is in known fresh air before performing a calibration.
Humidity
If humidity changes by any significant degree (e.g., going from a dry, air conditioned environment to outdoor, moisture laden
air), oxygen readings can be reduced by up to 0.5 %, due to water vapor in the air displacing oxygen.
The oxygen sensor has a special filter to reduce the effects of humidity changes on oxygen readings. This effect will not be
noticed immediately, but slowly impacts oxygen readings over several hours.
Temperature
The sensors have built-in temperature compensation. However, if temperature shifts dramatically, the sensor reading may
shift. Zero the device at the work site temperature to minimize the effect of temperature changes.
1.3.8 Storage
When not in use, store the device in a safe, dry place between 18 °C (64 °F) and 30 °C (86 °F).
WARNING!
Do not store the device where silicone vapors are present or in the presence of silicone components, lubricants, cleaners or
other substances containing silicone. Silicone can desensitize the combustible gas sensor, thereby giving erroneously low
readings. Calibrate the detector upon removal from storage and prior to use.
Failure to follow this warning can result in serious personal injury or death.
7 ALTAIR io 4
US 1 Safety Notices
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