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The T90-time is the time in which a sudden change of the measurand (e.g. the gas
concentration) reaches 90% of its final value.
6.4 Output Setup
The FTC320 is equipped with three analog outputs:
• One isolated current output with an output range of 0 to 20 mA called Current Out.
• Two not DC-isolated voltage outputs with an output range from 0 to 10 V:
– Voltage Out 1.
– Voltage Out 2.
These analog outputs can be configured from the Output Setup menu.
The FTC320 internally uses up to five channels to process different measured gas concentrations,
which can be mapped to the analog outputs mentioned above. For each output, a channel can be
selected as the signal source. The five channels are typically configured as shown in Table 6.1. Note
that your device might only use a sub-set of the 5 channels shown in Table 6.1 and not all of them,
depending on the hardware configuration. In this case, the other channels will not output any meaningful
data.
Channel (Ch.) Routed Measurement
1
AUX (Measurement of O
2
by the external electrochemical sensor, of
humidity, or flow).
2* The gas measurement of the infrared channel IR2.
3* The gas measurement of the infrared channel IR3.
4* The gas measurement of the infrared channel IR4.
5 The gas measurement of the thermal conductivity channel.
Table 6.1: The measurement channels and the parameters routed to them. The channel numbers with
an asterisk (2*, 3*, and 4*), i.e. the infrared channels, are only used in the FTC400!
6.4.1 Current Output Setup
The measuring range is typically mapped to a current output of 4mA to 20mA, where 4mA (the min-
imum value) corresponds to the beginning of the measuring range and 20mA (the maximum value)
corresponds to its end. The FTC device is equipped with 4 current output modes suitable for different
purposes (For setting the output range (in vol.% or ppm), see section 7.2).
In Table 6.2 the 4 current output modes are explained, from which you can choose the most suitable
one for you.
Figure 6.7 also shows the meaning of the current ranges for the commonly used 4-20mA output with
error indication (NARMUR compliant).
Below is a step-by-step instruction on how to adjust the current output:
File name:
FTC320Ex Operating Manual_1.09KD201009MPO3V04.pdf
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