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| | | CH-D3 Performance Data | | |
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| | | Figure 2 Voltage Sensitivity | | |
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| | | 16 | | |
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| | | Figure 2 shows the variation in sensitivity caused by changes in pellistor voltage. The pellistor is relatively insensitive to small voltage variations at 3volts, avoiding individual bridge voltage adjustments. Data are taken from a typical batch of sensors. | | |
| | | > 14 cm cri > 10 <d 8 <d W SS 2 | | |
| | | 0 | | |
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| | | 1900 | | 2100 | | 2300 | | 2500 Bridge voltage (V) | | 2700 | | 2900 | | 31 00 | | |
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| | | Figure 3 Zero Temperature Dependence | | |
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| | | | | | | | | | 1-*04"j | | | | | i———- Wi | | | | | | | | | | | | | | | | ^^^^ | | | | | | | | | | | | | | | | | | | | | | | | -1-1-1-1-95- | | | | | | | | | | |
| | | Figure 3 shows the variation in output caused by changes in temperature, expressed as % change, referenced to 20oC. | | |
| | | 0 CO | | |
| | | lu _l ro er N | | |
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| | | 30 | | |
| | | -30 | | -20 | | -10 | | 0 | | 10 20 Temperature (oC) | | | 40 | | 50 | | |
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| | | Figure 4 HMDS Poisoning | | |
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| | | 1.4 | | |
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| | | When exposed to 42ppm HMDS in 25% LEL methane, sensitivity loss is slower than equivalent pellistors. | | |
| | | 1.2 | | |
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| | | 1 | | |
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| | | C If) a | | |
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| | | t | | 0.6 | | |
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| | | u p t u o | | |
| | | 0.4 | | |
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| | | 0.2 | | |
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| | | 0 | | |
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| | | 0 | | 1000 | | 2000 | | 4000 5000 Time (seconds) | | 6000 | | |
| | | 3000 | | | 7000 | | 8000 | | 9000 | | |
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| | | For further information on the performance of this sensor, on other sensors in the range or any other subject, please contact Alphasense Ltd. For Application Notes visit "www.alphasense.com". | | |
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| | | In the interest of continued product improvement, we reserve the right to change design features and specifications without prior notification. The data contained in this document is for guidance only. Alphasense Ltd accepts no liability for any consequential losses, injury or damage resulting from the use of this document or the information contained within it ( ©ALPHASENSE LTD ) Doc. Ref. TDS/CHD3/Issue 12 | | |
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