15
CO thresholds
Ambient alarm thresholds are pre-set as per Acute Exposure Guideline Levels (AEGL’s)
12
:
Colour
ppm
Audible alert
Green
<100
No audible alert
Amber
100-199
1 short beep every 2 seconds
Red
≥
200
3 short beeps every 3 seconds
Both thresholds can be reduced so that they are triggered at lower levels but cannot be increased to be
triggered at higher levels. When an alarm is triggered, the device will automatically start to log in the
history each minute for 8 hours or until the monitor is switched off, so that incidents can be pinpointed to a
time and date. Breath test pre-set thresholds are as follows.
Colour
Description
Reading (%COHb & ppm)
Blue
Normal (non-smoker) reading
%COHb
≤
0-2.00ppm = 0.9
Red
Abnormal CO level on breath
requiring further investigation
%COHb >2ppm = 10+
This threshold for colour change can be adjusted up or down to suit local regulations.
