MSA FiveStar Instruction Manual download pdf (Page 35)

When the amount of gas detected by the FiveStar Alarm is

greater than the eight-hour TWA limit:

• Alarm sounds

• Alarm lights flash

• On the Exposure display page, the TWA alarm flag displays.

WARNING

If the TWA alarm condition is reached while using the

instrument as a personal or area monitor, leave contaminated

area immediately; the ambient gas concentration has

reached the preset TWA alarm level. Failure to follow this

warning will cause over-exposure to toxic gases which can

result in serious personal injury or death.

The TWA alarm is calculated over an eight-hour exposure.

Calculation examples are as follows:

• 1-hour exposure of 50 PPM:

(1 hour x 50 PPM) + (7

hours x 0 PPM )

8 hours

= 6.25 PPM

• 4-hour exposure of 50 PPM

4-hour exposure of 100 PPM:

(4 hours x 50 PPM) + (4

hours x 100 PPM )

8 hours

= 75 PPM

• 12-hour exposure of 100 PPM:

(12 hours x 100 PPM)

8 hours

= 150 PPM

NOTE: The accumulated reading is always divided by eight

hours.

To reset the alarm: in the TWA display, press the RESET button.

Datatagging Option

Datatagging allows the user to save an alphanumeric designation

in the instrument’s session datalog. This data tag is saved with a

time stamp so it can then be related to the gas readings at that

time. This provides the user with an instrument location record

coupled with a date and time.

Instruction Manual Chapter 2, Using the FiveStar Alarm

FiveStar Alarm 2-19

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MSA FiveStar Instruction Manual Page 35