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Ammonia Sensor (NH3 Sensor) - NH3-A1

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• Range: 200 ppm NH3 limit of performance warranty
• Sensitivity: 17 to 27 nA/ppm in 50ppm NH3
• Response time t90: <60s from zero to 50ppm NH3
• Resolution: <0.3 RMS noise (ppm equivalent)
• Operating life: >24 months
• Temperature range: -30 to 50°C
• Pressure range: 80 to 120 kPa
• Humidity range: 15 to 90 % rh continuous
• Weight: <6g

Model Number: NH3-A1
Data Sheet:

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Product Specification

NH3-A1 Ammonia Sensor NH3 Sensor Description
Alphasense is expanding its line of electrochemical toxic gas sensors to address industry-specific requirements, including emissions monitoring, process safety, environmental monitoring and VOCs.

Ammonia (NH3)
Our first family of Ammonia sensors. This sensor is designed for higher concentrations of Ammonia. Sensors for lower level detection are in development.

NH3-A1 Ammonia Sensor NH3 Sensor PERFORMANCE
Sensitivity	nA/ppm in 50ppm NH3	17 to 27
Response time	t90 (s) from zero to 50ppm NH3	<60
Zero current	ppm equivalent in zero air	<20
Resolution	RMS noise (ppm equivalent)	<0.3
Range	ppm NH3 limit of performance warranty	200
Linearity	ppm error at full scale, linear at zero and 20ppm NH3	+1 to -10
Overgas limit	maximum ppm for stable response to gas pulse	1000

NH3-A1 Ammonia Sensor NH3 Sensor LIFETIME
Zero drift	ppm equivalent change/year in lab air	<2
Sensitivity	drift % change/year in lab air, monthly test	<3
Operating life	until 80% original signal (24 month warranted)	>24

NH3-A1 Ammonia Sensor NH3 Sensor ENVIRONMENTAL
Sensitivity @ -20°C	% (output @ -20°C/output @ 20°C) @ 20ppm	ND
Sensitivity @ 50°C	% (output @ 50°C/output @ 20°C) @ 20ppm	ND
Zero @ -20°C	ppm equivalent change from 20°C	ND
Zero @ 50°C	ppm equivalent change from 20°C	ND

NH3-A1 Ammonia Sensor NH3 Sensor CROSS SENSITIVITY
H2S sensitivity	% measured gas @ 20ppm H2S	<300
NO2 sensitivity	% measured gas @ 20ppm NO2	<-300
Cl2 sensitivity	% measured gas @ 10ppm Cl2	<-300
NO sensitivity	% measured gas @ 50ppm NO	ND
SO2 sensitivity	% measured gas @ 20ppm SO2	ND
CO sensitivity	% measured gas @ 400ppm CO	<20
H2 sensitivity	% measured gas @ 400ppm H2	<15
C2H4 sensitivity	% measured gas @ 400ppm C2H4	ND
CO2 sensitivity	% measured gas @ 5% CO2	ND

NH3-A1 Ammonia Sensor NH3 Sensor KEY SPECIFICATIONS
Bias voltage	mV (Working Electrode potential is above ground)	+200
Temperature range	°C	-30 to 50
Pressure range	kPa	80 to 120
Humidity range	% rh continuous	15 to 90
Storage period	months @ 3 to 20°C (stored in sealed pot)	6
Load resistor	Ω (recommended)	10 to 47
Weight	g	<6