MSA OPERATION
6) IR mode
When instrument displays "IR?", press the button to enter IR mode.
If IR communications are not detected for three minutes or the button is
pressed, the instrument will exit this mode (Æ Fig. 5 for additional details).
3.6. Displaying the Instrument Data - Steel Mill Version only
A single, quick press on the button turn ON the backlight for 10 seconds. The
Information page can be accessed by pushing the button for about one second.
The instrument beeps twice.
This includes:
1) Test gas mode
2) Functional check of LCD, vibrator, LEDs and horn
3) Software version displays.
4) Gas type
5) Low Alarm setpoint ("
LO" "ALARM")
6) High Alarm setpoint ("
HI" "ALARM")
7) STL Alarm setpoint
8) TWA Alarm setpoint
9) Peak Reading
Toxic ("
HI")
The Peak/Hi and Min/Low values can be cleared.
When this page is displayed, press the button to clear.
"CLR" is displayed
Value is deleted
10) Short Term Exposure Limit ("
STL")
The STL reading displays that the instrument calculated since power-ON.
When this page is displayed, press the button to clear.
"
CLR" is displayed
Value is deleted
STEL value is automatically reset to zero when the instrument is turned ON.
STEL value is calculated over a 15-minute exposure.
The following formula is used to calculate the STEL value:
((Minute #1 PPM value) + (Minute #2 PPM value) +...
+ (Minute #15 PPM value)) / (15 minutes) = PPM STEL value
If the instrument is ON for less than 15 minutes:
the balance of the minute PPM values is set to zero and
the total is divided by 15 minutes
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