User's Manual

ConneX1 Operator’s Manual
17

NOTE
        

20.8 based: When enabled, the detector assumes 20.8% O
2
as ambient air (factory
default is 20.9% O
2
). Applicable to the O2 sensor only.
The detector is shipped with the 20.8 based option disabled.
Auto Zero on Startup: When enabled, the sensor automatically zeros during
the startup sequence.
The detector is shipped with the Auto Zero on Startup option enabled.
    If enabled, the audible alarm can
be disabled during a low alarm. The LEDs and visual alarm indicators remain
active until the gas concentration changes or the detector deactivates. For toxic
sensors only.
Press
to acknowledge the low alarm and deactivate the audible alarm. If the
alarm escalates to a high, TWA, or STEL alarm, the audible alarm reactivates.
The detector is shipped with the  disabled.
STEL Period: The STEL Interval option provides protection for workers from over
exposure to high concentrations of gas, and is based on user-defined 5-15 minute
intervals. When the maximum STEL is reached, the detector alarms to notify the
worker. For toxic sensors only.
CAUTION

Enter the interval (5-15 minutes) in the  field. The detector
is shipped with a default setting of 15 minutes.
TWA Method: The TWA Method defines the TWA calculating method. Select either
the US Occupational Safety and Health Administration (OSHA) or the American
Conference of Governmental Industrial Hygienists (ACGIH) TWA calculating
method. The detector is shipped with the default method of US OSHA. For toxic
sensors only.
Ŗ US OSHA Method: 8 hours moving average
The US OSHA method is defined as a moving average that accumulates
over an 8-hour average. If the worker is in the field longer, the oldest
accumulated values (first hour) are replaced by the newest values
(ninth hour). This continues for the duration of the work shift until the
detector is deactivated.
Ŗ ACGIH Method: Infinite accumulated average to 8 hours
The ACGIH method is defined as the infinite (total) accumulated
average, where it is 2 hours or 8 hours.
TWA Period: The  option calculates a time-weighted moving
average of accumulated gases over a period of 4-16 hours, to ensure the detector
alarms when the defined maximum average is accumulated. For toxic sensors only.
Example: The TWA Period option is set to 8 hours. Therefore, the moving average
accumulates over a 8-hour average. If the worker is in the field longer, the oldest
accumulated values (first hour) are replaced by the newest values (ninth hour).
This continues for the duration of the work shift until the detector is deactivated.