D1
+
PERSONAL DUST MONITOR34
13.1 Alarm calculations
The D1
+
uses the following calculation for the monitoring of STEL threshold breach.
STEL, where STEL TIME is in minutes:
The D1
+
uses the following calculation for the monitoring of long-term exposure reading/
TWA threshold breach.
TWA, where TWA TIME is in minutes:
Note: The TWA calculation will reset on device power cycle, the sum is calculated on device
start up and initial sampling to the current run time and will accumulate until the device is
switched o.
13.2 Alarm acknowledgement
In the event that a warning alarm is triggered, the D1
+
will auto-latch to ensure that
a conscious action is made to acknowledge the warning. During alarm state, users can
acknowledge triggered alarms which will silence the audio alarm, however, the LED warning
indication will remain illuminated (solid) to indicate the alarm conditions are still present.
It is only at the point of particulate level decrease to below the permissible threshold, 95% of
the alarm set point, will the alarm reset and illuminated LED switch o.
To acknowledge a latched alarm, press, hold and release the power button after 2 seconds
which will confirm response via an LED sequence. (Scrolling Illumination of alarm colour,
followed by a scrolling green sequence).
Note: If an alarm is not acknowledged by the user, the D1
+
will remain latched with the
illuminated LED and audio warning indefinitely.
The D1
+
device will only re-alarm on increasing or continued particulate levels above the
permissible threshold, after the original alarm has been user acknowledged and self-cleared.
XD1+_User manual_P5650.1600_Rev A
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