The B4 series (4-electrode sensors) provides OEMs with reliable sensors for use in a number of high volume applications and especially Air Quality Networks where very low parts per billion (ppb) detection levels are required.
Strong signal levels combined with low zero current allows resolution to < 10 (ppb) and a wide operating range. The sensors are suitable for use in fixed installation sensing heads, portable safety instruments, urban/indoor air monitoring and stack gas analysers.
The B4 series of sensors offer our electrolyte leak-free guarantee and reliable long-term detection performance. The leak-proof housing is moulded with a colour coded top for ease of identification.
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PERFORMANCE |
Sensitivity Response time |
nA/ppm at 2ppm CO t90 (s) from zero to 10ppm CO |
420 to 650 < 25 |
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Zero current |
nA in zero air at 20°C |
+30 to -130 |
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Noise* |
±2 standard deviations (ppb equivalent) |
4 |
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Range |
ppm limit of performance warranty |
1000 |
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Linearity |
ppb CO error at full scale, linear at zero, 500ppm CO |
20 to 35 |
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Overgas limit |
maximum ppm for stable response to gas pulse |
2000 |
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LIFETIME |
Zero drift |
ppb equivalent change/year in lab air |
< ±100 |
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Sensitivity drift |
% change/year in lab air, monthly test |
< 10 |
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Operating life |
months until 50% original signal (24 month warranted) |
> 36 |
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ENVIRONMENTAL |
Sensitivity @ -20°C |
(% output @ -20°C/output @ 20°C) @ 5ppm CO |
40 to 70 |
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Sensitivity @ 50°C |
(% output @ 50°C/output @ 20°C) @ 5ppm CO |
110 to 125 |
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Zero @ -20°C |
nA |
-30 to +30 |
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Zero @ 50°C |
nA |
-50 to -200 |
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CROSS SENSITIVITY |
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Filter capacity |
ppm·hrs H2S |
250,000 |
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H2S sensitivity |
% measured gas @ 5ppm H2S |
< 1 |
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NO2 sensitivity |
% measured gas @ 5ppm NO2 |
< 1 |
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Cl2 sensitivity |
% measured gas @ 5ppm Cl2 |
< 1 |
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NO sensitivity |
% measured gas @ 5ppm NO |
< -3 |
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SO2 H2sensitivity sensitivity |
% measured gas @ 5ppm SO2 % measured gas @ 100ppm H2 at 20oC |
< 0.1 < 10 |
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C2H4 sensitivity NH3 sensitivity |
% measured gas @ 100ppm C2H4 % measured gas @ 20ppm NH3 |
< 1 < 0.1 |
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KEY SPECIFICATIONS |
Temperature range °C range |
-30 to 50 |
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Pressure range kPa |
80 to 120 |
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Humidity range % rh continuous |
15 to 90 |
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Storage period months @ 3 to 20°C (stored in sealed pot) |
6 |
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Load resistor W(ISB circuit is recommended) |
33 to 100 |
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Weight g |
< 13 |
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