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2.4 Gas Specifications

Parameter

Comments

Values

Units

Min.

Max.

Output signals

VOC Index

1

–

500

VOC Index points

1

–

500

NOx Index points

Device-to-device

variation

–

<±15

<±15

–

VOC Index points

or

% VOC Index m.v.

(the larger)

–

<±50

<±50

–

NOx Index points

or

% NOx Index m.v.

(the larger)

Repeatability

–

<±5

<±5

–

VOC Index points

or

% VOC Index m.v.

(the larger)

–

<±10

<±10

–

NOx Index points

or

% NOx Index m.v.

(the larger)

Response time

Changing concentration

from 5 to 10 ppm of ethanol, at

sampling interval of 1 s

<10

–

s

<30

–

s

Switch-on behavior

<60

–

s

Time until specifications in this table

are met

VOC Index <1

–

h

NOx Index <6

–

h

Table 5: Gas sensing specifications at 25 °C and 50 % RH in zero air (considered as clean air for indoor air quality applications). All

concentrations refer to ethanol as test gas.

11

95 % of the sensors will be within the typical tolerance corresponding to 2σ assuming a normal distribution for ≥100 sensors.

12

Evaluated using the calibration and test sequence according to the application note SGP40 – Testing Guide.

13

the same duration.