UK Alphasense Gas Sensor Ammonia Sensor - NH3-AF

Performance

Sensitivity

Sensitivity in 50ppm NH3 (nA/ppm)

20~40

Response Time

t90 time from zero to 50ppm NH3 with 300s gas flow (s)

< 60

Zero Current

Equivalent ppm value in zero air

<±7

Resolution

RMS noise (equivalent ppm value)

< 0.7

Range

Measurement limit ensuring product performance (ppm)

100

Linearity

ppm error of full scale, linear from 0 to 40ppm

5~-5

Overload

Maximum ppm for stable response to gas pulses

200

Lifetime

Zero Drift

Equivalent ppm change per year in laboratory air

< 2

Sensitivity Drift

Percentage change per year in laboratory air, tested monthly

< 3

Operating Life

Months until output drops to 80% of original signal (12-month warranty)

> 24

Environment

Sensitivity at -20°C

At 50ppm NH3, (output at -20°C / output at 20°C) %

100~110

Sensitivity at 50°C

At 50ppm NH3, (output at 50°C / output at 20°C) %

100~110

Zero at -20°C

Change in equivalent ppm relative to zero at 20°C

-10~0

Zero at 50°C

Change in equivalent ppm relative to zero at 20°C

5~20

Cross Sensitivity

H2S

Percentage of sensitivity to measured gas at 20ppm H2S

<±3

NO2

Percentage of sensitivity to measured gas at 20ppm NO2

< -60

Cl2

Percentage of sensitivity to measured gas at 10ppm Cl2

< -300

NO

Percentage of sensitivity to measured gas at 50ppm NO

< 20

SO2

Percentage of sensitivity to measured gas at 20ppm SO2

nd

CO

Percentage of sensitivity to measured gas at 400ppm CO

< 25

H2

Percentage of sensitivity to measured gas at 400ppm H2

< 15

C2H4

Percentage of sensitivity to measured gas at 400ppm C2H4

< 2

CO2

Percentage of sensitivity to measured gas at 5% Vol CO2

0

Key Parameters

Bias Voltage

mV (working electrode potential greater than zero)

+200

Temperature Range

℃

-30~50

Pressure Range

kPa

80~120

Humidity Range

Continuous relative humidity percentage

15~90

Storage Life

Months of storage at 3~20°C (must be stored in sealed container)

6

Load Resistor

Ω (recommended)

10~47

Weight

g

< 6