Individual Sensor Board (ISB) Board Technical Specification Alphasense B4 4-Electrode Gas Sensors 4-Electrode Sensors The Individual Sensor Board (ISB) is designed for use with the Alphasense B4 family of four-electrode gas sensors. This potentiostat provides a dual channel voltage output. A low noise bandgap provides the bias voltage for NO sensors and the ISB can measure both oxidising (CO, H2S, SO2, and NO) and reducing (O3 and NO2) gases. The ISB is configured as four versions for specific sensors: NO, NO2, O3 and CO/ H2S/ SO2. Designed for low power applications, the ISB requires 3.5 to 6.4 stable DC supply at only 1mA. If the ISB is supplied separate from the B4 sensor, ensure it is matched to the sensor type according to Table 1: Table 1 ISB Part numbers Part number Figure 2 ISB dimensions and socket for power and signals Both the working electrode and auxiliary electrode (used to compensate for zero current) have equivalent two stage amplifiers and the buffered signals are available on the 6-way Molex socket along with the 6.0VDC power IN pins. There are no adjustments on the ISB: zero offset and gain are fixed. The ISB is a very low noise design and care must be taken with grounding and screening to achieve good ppb resolution. The power supply must be filtered to avoid noise on the output. Accessories include gassing hoods for calibration checks and mounting pillars, sealing gaskets and hardware for easy fitting to your housing. 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

Board Individual Sensor Board (ISB) 4-Electrode Sensors Alphasense B4 4-Electrode Gas Sensors Technical Specification Figure 3 ISB dimensions and mounting hole locations Table 2 Optional ISB Accessories Optional fitting kit # 000-0ISB-KIT 4 x pillars M3 x 8 button head screws Molex socket housing with 150 mm leads NB: 000-0ISB-KIT is required with any gas hood Figure 4 Gas Hood with sensor and ISB Part Number PFA Swagelok ¼" tube connector Nickel plated brass ¼" BSP barb (standard fitting) For further information on the performance of sensors in the Alphasense range or any other subject, please...