24 Questions
After the SPAN calibration is complete, what does the instrument display?
SPAN COMB/EX O2 PASS
What should you do after completing the calibration procedure?
Close the valve on the regulator
What happens to sensors that fail calibration?
They are left unchanged
What should you do if the combustible sensor fails calibration?
Replace the combustible sensor
What happens if the instrument cannot calibrate one or more sensors?
It goes to the SPAN ERR page
Why might the instrument briefly go into an exposure alarm after calibration?
Due to residual gas present
What should you do if an error occurs during operation?
Use the displayed error codes to determine next steps
Who should perform maintenance procedures on the Altair 4 Multigas Detector?
Only a person authorized by MSA
Where should the toxic sensor be placed in the sensor holder?
Left-hand position
What should be done if a sensor is not to be installed?
Install a sensor plug
What can occur if instrument components are substituted improperly?
Impaired instrument performance and voided agency approvals
How long should sensors stabilize before calibration?
At least 30 minutes
What should be used to clean the exterior of the instrument?
A damp cloth
What action should be taken if the 'ERROR TEMP' error message is displayed?
Return the instrument to its normal temperature range and recalibrate
What is the temperature range for storing the instrument?
Between 65°F and 86°F (18°C and 30°C)
What does the 'BATT ALARM' error message indicate?
The battery is completely discharged
What should be done if the 'ERROR RAM' error message is displayed?
Contact MSA for assistance
Why is calibration required after a sensor is installed?
To ensure the instrument performs as expected
What should be done after storing the instrument?
Recheck the instrument's calibration
What is the consequence of ignoring the 'LOW BATT' warning?
The instrument will no longer sense gas
What should be done when replacing sensor filters?
Peel off the old filters carefully
What action should be taken if the 'ERR/AD COMB' error message is displayed?
Contact MSA for assistance
What is the recommended action when the 'ERROR UNK' error message is displayed?
Contact MSA for assistance
Why is it essential to follow the troubleshooting guide in this document?
To prevent serious personal injury or death
Study Notes
Calibration
- After SPAN calibration, the instrument displays "SPAN COMB/EX O2 COMB/EX O2 PASS" or "SPAN ERR" along with the label of any failed sensor, then returns to Measuring mode.
- The calibration procedure adjusts the span value for sensors that pass the calibration test, while sensors that fail remain unchanged.
Finishing Calibration
- Close the valve on the regulator after calibration.
- Remove the calibration cap after calibration.
- The instrument may briefly go into an exposure alarm after calibration due to residual gas.
Autocalibration Failure
- If the instrument cannot calibrate one or more sensors, it goes to the SPAN ERR page and remains in alarm until the user presses the button.
- Sensors that fail calibration are indicated by flashing sensor icons.
- If the combustible sensor fails calibration, replace it.
Maintenance
- Use displayed error codes to determine next steps in case of an error during operation.
Installing Sensors
- Insert the toxic sensor in the left-hand position of the sensor holder.
- Insert the O2 sensor in the middle position of the sensor holder.
- Insert the combustible sensor in the right-hand position of the sensor holder, ensuring the groove aligns with the tab at the top of the holder.
- Install a sensor plug if a sensor is not being installed.
Sensor Filter Replacement
- Carefully remove old filters, taking care not to damage the case.
- Peel off the backing of new filters, exposing the adhesive.
- Apply the filters to the inside of the front case, ensuring proper orientation.
Reinstalling Sensors
- Reinstall the sensor gasket in the case front, ensuring it is properly installed.
- Reinstall the screws.
- If a sensor channel was deactivated, turn it ON in the sensor setup.
- Calibrate the instrument after sensors have stabilized for at least 30 minutes.
Warning
- Calibration is required after a sensor is installed; otherwise, the instrument will not perform as expected, and users may face serious personal injury or death.
Cleaning and Storage
- Clean the exterior regularly with a damp cloth, avoiding cleaning agents.
- Store the instrument in a safe, dry place between 65°F and 86°F (18°C and 30°C) when not in use.
- Always recheck instrument calibration before use after storage.
Troubleshooting
- Refer to the troubleshooting table for error codes and reactions.
This quiz covers the calibration process of the AltaIR 4 instrument, including the display of results and error messages.
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