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D2 Miniature Sensors0 pages
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| PATENTED and PATENT PENDING | |||||||||||||||||||||||||||||||||||||
| Introduction | |||||||||||||||||||||||||||||||||||||
| The world wide use of multigas portable personal safety monitors has grown since the 1970s to include an ever increasing number of industries. The one requirement in common to the majority of these instruments is the need to measure both Carbon Monoxide and Hydrogen Sulfide simultaneously. Alphasense now offers a compact dual gas sensor which allows designers to reduce significantly instrument size and cost. The D sensor provides a unique approach to the dual gas sensor in both its size and working electrode configuration. The use of a high capacity filter over the Carbon Monoxide working electrode eliminates Carbon Monoxide cross sensitivity to Hydrogen Sulfide. Adoption of the QD2 in portable instrument designs enables accurate factory, service and field calibration of instruments using multi-component gases without the fear of incorrect calibration of the Carbon Monoxide channel, providing reduced instrument manufacturing and service costs. | |||||||||||||||||||||||||||||||||||||
| D2 Specification Carbon Monoxide Channel PERFORMANCE Sensitivity nA/ppm in 400ppm CO 30 to 55 Response time t90(s) from zero to 400ppm CO < 25 Zero current ppm equivalent in zero air < ± 6 Resolution rms noise (ppm equivalent) 1 Range ppm CO limit of performance warranty 1000 Linearity ppm error at full scale, linear at zero and 400 ppm CO < 40 Overgas range maximum CO for stable response to gas pulse 5000 LIFETIME Zero drift ppm equivalent change/year in lab air n/d Sensitivity drift % change/month in lab air, monthly test n/d Operating life months until 80% original signal (24 month warranted) 24 | |||||||||||||||||||||||||||||||||||||
| Sensitivity @ -20oC % (output @ -20oC/output @ 20oC) @ 100ppm CO 50 to 71 Sensitivity @ 50oC % (output @ 50oC/output @ 20oC) @ 100ppm CO 106 to 114 Zero @ -20oC ppm equivalent change from 20oC -1 to 1 Zero @ 50oC ppm equivalent change from 20oC -1 to 4 | |||||||||||||||||||||||||||||||||||||
| ENVIRONMENTAL | |||||||||||||||||||||||||||||||||||||
| Filter Capacity | ppm-hours of Hydrogen Sulfide | 15,000 < 5 < 50 < 0.1 < 0.1 <55 < 0.1 < 0.1 | |||||||||||||||||||||||||||||||||||
| H2S NO NO2 Cl2 H2 SO2 NH3 | sensitivity % sensitivity % sensitivity % sensitivity % sensitivity % sensitivity % sensitivity % | measured gas @ 20ppm measured gas @ 50ppm measured gas @ 10ppm measured gas @ 10ppm | H2S NO NO2 Cl2 | ||||||||||||||||||||||||||||||||||
| CROSS SENSITIVITY | |||||||||||||||||||||||||||||||||||||
| measured gas @ 400ppm H2 @ 20oC | |||||||||||||||||||||||||||||||||||||
| measured gas @ 20ppm measured gas @ 20ppm | SO2 NH3 | ||||||||||||||||||||||||||||||||||||
| Temperature range oC | |||||||||||||||||||||||||||||||||||||
| -30 to 50 80 to 120 15 to 90 6 10 to 100 < 2 | |||||||||||||||||||||||||||||||||||||
| KEY SPECIFICATIONS | |||||||||||||||||||||||||||||||||||||
| Pressure range Humidity range Storage period Load resistor Weight | kPa %rh continuous (see note below) months @ 3 to 20oC (stored in sealed pot) Q (recommended) g | ||||||||||||||||||||||||||||||||||||
| Note: Above 85% rh and 40OC a maximum continuous exposure period of 10 days is warranted. Where such exposure occurs the sensor will recover normal electrolyte volumes, when allowed to rest at lower %rh and temperature levels for several days. NOTE: all sensors are tested at ambient environmental conditions, with 10 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: sensors@alphasense.com Website: www.alphasense.com | |||||||||||||||||||||||||||||||||||||
