MSA ALTAIR io 4 User Manual

• 4 hours of exposure at 50 ppm in hours 8 - 12
• 8 hour shift length selected
4.2.2 Short-Term Exposure
The device can monitor the short-term exposure of toxic gases which calculates the average exposure over the most recent
15 minute period since the device was turned on or since the short-term exposure calculation was reset.
The current short-term exposure calculation can be viewed and reset through the device menu.
NOTE: Power cycling the device will reset the short-term exposure calculation
Example Calculation
• 15 minutes of exposure at 35 ppm:
• 10 minutes of exposure at 35 ppm and 5 minutes of exposure at 5 ppm:
4.2.3 Reading Adjustment Factor
Adjustment factors provide the ability to provide gas readings to a target gas that may differ from gas used for calibration.
The ALTAIR io 4 simplifies the use of adjustment factors through its device configuration.
To utilize adjustment factors:
1. Calibrate the ALTAIR io 4 to Methane (CH
4
).
2. Select a Custom Combustible Conversion in the device configuration.
3. Enter applicable adjustment factor found in the table below.
ALTAIR io 4 Adjustment Factors
Calibration Gas Target Gas Adjustment Factor
Methane Methane 0.99
Butane 1.74
Propane 1.72
Pentane 1.84
Hydrogen 1.06
Adjustment Factors were calculated by calibrating an ALTAIR io 4 to 1.45% Methane (CH
4
) and measuring the response to
a known concentration of the relevant target gas found in the table. The response to the target gas was divided by the
response to Methane.
Response Notes
ALTAIR io 4 30
4 Features US

MSA ALTAIR io 4 Specifications

General

Brand	MSA
Model	ALTAIR io 4
Category	Gas Detectors
Language	English