• When the measured CO
2
rises above 2000 ppmCO
2
, the output rises above 5 V.
• The output keeps rising until the measurement is 2100 ppmCO
2
, at which point the
probe outputs 5.25 V.
• If the CO
2
level rises above 2100 ppmCO
2
, the output still remains at 5.25 V.
• If the CO
2
level rises above 2200 ppmCO
2
, the output enters the error state, which is 0
V for the 0 ... 5 V output.
Output
voltage (V)
Time
0.00
In error state at
>2200 ppm
(2000 ppm + 10%)
5.00
5.25
Clipped at
2100 ppm
(2000 ppm + 5%)
Regular
measurement
Output clipping limit
Error level
Figure 5 Example of Analog Output Overrange Behavior
This example uses output scaled to 0 ... 5 V and 0 ...2000 ppmCO
2
, error level set to 0 V,
clipping set to 5 % overrange, and error limit set to 10 % overrange. CO
2
concentrations
(ppm) are indicated for the clipping point and error limit point.
This overrange and error behavior is
specific to the analog output, and does not aect the
readings of the digital outputs.
You can change the analog output overrange behavior using the aover command.
2.8
Safety
The probe delivered to you has been tested for safety and approved as shipped from the
factory. Note the following precautions:
Chapter 2 – Product Overview
19
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