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Depressing the “OK” pushbutton will display one of the following screens:
<gas> ALARM
For Toxic Gases
NON-LATCHING
LATCH OK
O
2
ALARM
For O
2
NON-LATCHING
LATCH OK
The status of the alarms will be displayed as “NON-LATCHING” or
“LATCHING”. Status can be changed by depressing the left pushbutton.
Depress the “OK” pushbutton to leave the status as indicated. If neither
pushbutton is selected, after fifteen (15) seconds the unit will automati-
cally return to the Operating Mode with the new alarm setpoints in effect
and the alarms at the status indicated.
Note: The instrument will not operate using any new setpoint for
determining an alarm condition until it returns to the operating
mode after a setpoint has been changed.
While in the setpoint menu the instrument remains operational. If
an alarm condition occurs, the instrument will override the setpoint
menu and display the alarm as appropriate. The changed setpoint
will not take effect and the previous settings will be reestablished.
No user menu’s can be accessed when a instrument is in an alarm
condition until the unit is turned “OFF”. When turned back “ON”, if
an alarm state occurs during the first minute of operation, all user
menu’s are accessible.
6.8 TWA / STEL MENU (TOXIC GASES ONLY)
The SCOTT INSTRUMENTS MINI-SA has factory preset “TWA/STEL” alarms.
When the values for these alarms are exceeded, the instrument alarm will
activate as described in Section 4.0. The TWA (Time Weighted Average)
function of the instrument averages the level of toxic gas over an eight (8)
hour period and alarms when the preset TWA value of in parts per million is
exceeded.