3.2. Turning ON and Fresh Air Setup

Instrument operation is dialog driven from the display with the aid of the three Function buttons (see Section 2.2.1). For more information, see the flow charts in section 7.

Turn the instrument ON with the button.

The instrument performs a self test and then goes to Fresh Air Setup:

• all display segments are activated
• audible alarm sounds
• alarm LEDs light
• vibrating alarm is activated.

During the self test, the instrument checks for missing sensors. In the case of a missing sensor, the instrument displays the Sensor Missing screen and alarms until it is turned OFF. Otherwise, the turn-ON sequence continues.

The instrument displays:

• Alarm and display self test
• Manufacturer name
• Instrument name
• Software version
• Sensor discovery
• Combustible gas type
• Toxic gas units
• Alarm setpoints ( , ) ( , )
• Calibration values
• Date and time display
• Last cal date (if activated)
• CAL due date (if activated)
• Fresh Air Setup option.

Refer to flowchart in Appendix, section 7.1.

3.2.1 Screen Displays during Startup

During the power-up sequence, all automatic page display timeouts are preset to a range from two to four seconds. Several sequences and screens occur during start up:

Instrument Self Test

The instrument performs a self test.

Instrument Name and Software version

Software version and instrument name display.

Combustible Gas Type

Name of Combustible Gas Type displays, e.g. BUTANE. Combustible gas type can be changed manually through the SENSOR SETUP menu or the MSA Link software.

Toxic Gas Units

Name of Toxic Gas Units displays (ppm or mg/m3).
Toxic units can only be modified through the MSA Link software.

Alarm Setpoints

Alarm setpoints for all installed and activated sensors display. LOW alarm setpoints display, followed by HIGH alarm setpoints. Alarm setpoints can be changed manually through the Setup menu or the MSA Link software.

STEL and TWA Setpoints

The preset STEL and TWA values for installed and activated sensors display.

Calibration Values

The preset STEL and TWA values for installed and activated sensors display.

Time and Date

The date displays in a month, day and year format.

In the event that the battery is fully discharged, the time and date reset. At startup, the user is prompted to enter the time and date.

If the time and date information is missing, they are reset to [Jan-01-2008] with time stamp [00:00].

Last CAL Date and CAL Due

These display options can be set by MSA Link software. If these options are not set, these screens are not displayed.

• By default Last Cal is activated.
• By default Cal Due is deactivated

Fresh Air Setup (FAS)

The FAS screen is prompted (section 3.2.2)

3.2.2 Fresh Air Setup (FAS)

The Fresh Air Setup (FAS) is for automatic ZERO calibration of the instrument.

The FAS has limits. The zero of any sensor that is outside of these limits will not be adjusted by the FAS command.

If a battery (4 hours for a fully discharged battery), allow the instrument