Danfoss DGS Series - AO Settings

5.8 AO Settings
The analogue output signal depends on above settings and the configuration of jumper JP5. The
output signal is continously monitored by the DGS. If the value deviates by more than 5% from the
expected value, an Error Message is generated. This might happen if the output is short-circuited. If
configured for current output (JP5 open) the alarm is also generated if the output is open-circuited.
In below examples, it is assumed that the output is in voltage (JP5 closed) and that a 0 – 20000 ppm
sensor is used.
The analogue output signal, AO is calculated by this formula:
Example 1 (default settings):
“AO output max. scaling” = 50%
“AO min. value” = 0 (default)
This means that in the formula:
• AO range = 10 V
• AO min. = 0 V
• ppm range = 10000 ppm
Hence, a measured value of 4000 ppm will result in the following output value:
Example 2:
“AO output max. scaling” = 100%
“AO min. value” = 2 V
This means that in the formula:
• AO range = 8 V
• AO min. = 2 V
• ppm range = 20000 ppm
Hence, a measured value of 4000 ppm will result in the following output value:
AO =
AO =
x AO range + AO min.
x 8 V + 2 V = 3.6 V
ppm value
4000 ppm
ppm range
20000 ppm
AO = x 10 V + 0 V = 4 V
4000 ppm
10000 ppm
Symbol Description Default Function
50%
100%
Selection of the ppm
measurement which will
give the maximum output
signal
50%
50% = at a concentration of 50% of the sensor head range the
output will be set to 10 V (20 mA without JP5 mounted)
100% = at a concentration of 100% of the sensor head range the
output will be set to 10 V (20 mA without JP5 mounted)
- -
DANFOSS ONLY SETTING
--
Do not change – If doing so, a small “noise signal” (step form) on
top of the measured ppm value with a duty cycle of app. 180s is
activated.
0 V
2 V
Selection of minimum
output signal
0 V
0 V = at the minimum measuring signal of the sensor, the output will
be set to 0V (0 mA without JP5 mounted)
2 V = at the minimum measuring signal of the sensor, the output will
be set to 2 V (4 mA without JP5 mounted)
Analog Output 1
50% -- min = 0 V.
AO Settings
This menu is for the configuration of the
analogue outputs.
If more than one sensor head is present, the
maximum value of the two measurements is
assigned to the output.
Using this function, it is possible to configure the
output signal.
The CO sensor with a range of 0 – 20000 ppm
has an output signal of 0 – 10 V corresponding to
0 – 10000 ppm as default.
As an example this may be changed to
e.g. 2 – 10 V for 0 – 20000 ppm by changing
settings to “100%” and “2 V”.
User Guide | Danfoss Gas sensor, type DGS
16 | BC291049702513en-000201 © Danfoss | Climate Solutions | 2022.01