Switch position
Setpoint in ppm CO
2
3
900 ppm
4
1000 ppm
5
1200 ppm
6
1400 ppm
7
1600 ppm
8
1800 ppm
9
2000 ppm
A hysteresis of 50 ppm is applied to prevent the relay from switching back and forth when the
measured value is near the setpoint value. The relay is activated/deactivated when the
measured CO
2
value passes the setpoint, plus/minus 50 ppm.
For example, consider a transmitter that has the relay setpoint set to
1000 ppm CO
2
. As the measured CO
2
value rises, the relay is activated at
1051 ppm. The relay remains activated until the measured value falls to 949 ppm.
2.4 CO
2
level indicator LEDs
Figure 10 CO
2
level indicator LEDs on model GMW83A
GMW80 Series User Guide
M211748EN-G
16