Merlin CO2 Monitor
User Guide
Rev: 1 05-19
5
2.6
0-10 Volt DC Output
The voltage will increase / decrease depending on the ppm read out of Co2 detected.
Model: 2800ppm Analogue output
Model: 4500ppm Analogue output
ppm
Voltage
ppm
Voltage
0-1000
0
0-500
2
1000-1500
4
500-750
3
1500-2000
6
750-1000
4
2000-2800
8
1000-1250
5
2800+
10
1250-1500
6
Model: 1500ppm Analogue output
1500-1750
7
2V per 1000ppm
1750-2000
8
2000-2400
9
2400-2800
10
2.7
Audible Alarm
There is a switch on the circuit board to activate/de-activate the audible
alarm.
ON = audible alarm on (default).
1 = audible alarm off.
3
LED Indication Status
Model: CO2 Monitor 1500ppm
Low (Green) LED
Good air quality, CO
2
<900ppm
Medium (Amber) LED
Moderate air quality, 900ppm> CO
2
<1200ppm
High (Red) LED
Poor air quality CO
2
>1200ppm
Model: CO2 Monitor 2800ppm
Low (Green) LED
Good air quality, CO
2
<1000ppm
Medium (Amber) LED
Moderate air quality, 1000ppm> CO
2
<1500ppm
High (Red) LED
Poor air quality CO
2
>1500ppm
