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H2S-B4

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H2S-B4

Product catalog summary

Performance Specifications:

Sensitivity: 1450 to 1900 nA/ppm at 2ppm H2S.
Response Time: Less than 40 seconds from zero to 2ppm H2S.
Zero Current: -150 to 0 nA in zero air at 20°C.
Noise: ±2 standard deviations equivalent to 1 ppb.
Range: Performance warranty up to 100 ppm H2S.
Linearity: Less than ±4 ppb error at full scale, linear at zero and 40ppm H2S.
Overgas Limit: Stable response to gas pulse up to 200 ppm.

Lifetime Specifications:

Zero Drift: Less than ±100 ppb equivalent change per year in lab air.
Sensitivity Drift: Less than 20% change per year in lab air, tested monthly.
Operating Life: More than 24 months until 50% of the original signal, with a 12-month warranty.

Environmental Specifications:

Sensitivity at -20°C: 77 to 90% output compared to 20°C at 2ppm H2S.
Sensitivity at 50°C: 100 to 110% output compared to 20°C at 2ppm H2S.
Zero at -20°C: 50 to 60 nA change from 20°C.
Zero at 50°C: -120 to -160 nA change from 20°C.

Cross Sensitivity:

NO2: Less than -10% at 5ppm.
Cl2: Less than -12% at 5ppm.
NO: Less than 12% at 5ppm.
SO2: Less than 20% at 5ppm.
CO: Less than 3% at 5ppm.
H2: Less than 0.5% at 100ppm.
C2H4: Less than 0.1% at 100ppm.
NH3: Less than 0.1% at 20ppm.
CO2: Less than 0.1% at 5%.

Key Specifications:

Temperature Range: -30 to 50°C.
Pressure Range: 80 to 120 kPa.
Humidity Range: 15 to 90% relative humidity.
Storage Period: 6 months at 3 to 20°C in a sealed pot.
Load Resistor: 33 to 100 Ω (ISB circuit recommended).
Weight: Less than 13 grams.

Figures and Diagrams:

Figure 1: H2S-B4 Schematic Diagram with dimensions in millimeters.
Figure 2: Sensitivity Temperature Dependence showing % output referenced to 20°C.
Figure 3: Zero Temperature Dependence showing zero current variation with temperature.
Figure 4: Linearity to 200 ppb H2S showing output in mV over time.

Additional Notes:

All sensors are tested at ambient conditions with a 47 ohm load resistor unless otherwise stated.
Customers should test sensors under their own conditions to ensure suitability.
Contact Alphasense for disposal instructions at the end of the product's life.

Catalog excerpts

Hydrogen Sulfide drog H2S-B4 Hydrogen Sulfide Sensor 4-Electrode 4-Electrode Technical Specification Figure 1 H2S-B4 Schematic Diagram Bottom View Sensitivity Response time Zero current Noise* Range Linearity Overgas limit Side View nA/ppm at 2ppm H2S t90 (s) from zero to 2ppm H2S nA in zero air at 20°C ±2 standard deviations (ppb equivalent) ppm H2S limit of performance warranty ppb error at full scale, linear at zero and 40ppm H2S maximum ppm for stable response to gas pulse * Tested with Alphasense ISB low noise circuit Zero drift Sensitivity drift Operating life ppb equivalent change/year in lab air % change/year in lab air, monthly test months until 50% original signal (12 month warranted) ENVIRONMENTAL Sensitivity @ -20°C (% output @ -20°C/output @ 20°C) @ 2ppm H2S Sensitivity @ 50°C (% output @ 50°C/output @ 20°C) @ 2ppm H2S Zero @ -20°C nA change from 20°C Zero @ 50°C nA change from 20°C CROSS SENSITIVITY NO2 sensitivity % measured gas Cl2 sensitivity % measured gas NO sensitivity % measured gas SO2 sensitivity % measured gas CO sensitivity % measured gas H2 sensitivity % measured gas C2H4 sensitivity % measured gas NH3 sensitivity % measured gas CO2 sensitivity % measured gas KEY Temperature range°C SPECIFICATIONS Pressure range kPa Humidity range % rh Storage period months @ 3 to 20°C (stored in sealed pot) Load resistor Ω (ISB circuit is recommended) Weight g At the end of the product’s life, do not dispose of any electronic sensor, component or instrument in the domestic waste, but contact the instrument manufacturer, Alphasense or its distributor for disposal instructions. NOTE: all sensors are tested at ambient environmental conditions, with 47 ohm load resistor, unless otherwise stated. As applications of use are outside our control, the information provided is given without legal responsibility. Customers should test under their own conditions, to ensure that the sensors are suitable for their own requirements. Alphasense Ltd, Sensor Technology House, 300 Avenue West, Skyline 120, Great Notley. CM77 7AA. UK Telephone: +44 (0) 1376 556 700 Fax: +44 (0) 1376 335 899 E-mail: [email protected] Website: www.alphasense.com

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H2S-B4 Performance Data Perf erformance Data Figure 2 Sensitivity Temperature Dependence Figure 2 shows the temperature dependence of sensitivity at 2ppm H2S. This data is taken from a typical batch of sensors. Figure 3 shows the variation in zero output of the working electrode caused by changes in 50 temperature, expressed as nA. Figure 3 Zero Temperature Dependence 50 0 -20 This data is taken from a typical batch of sensors. Contact Alphasense for futher information on zero current correction. Figure 4 shows response to 200ppb H2S. Use of Alphasense ISB circuit reduces noise to 1ppb, with...

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