ISB Individual Sensor Board0 pages

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.

Figure 1 ISB

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

Sensor

000-0ISB-00

CO-B4, SO2-B4, H2S-B4

000-0ISB-01

NO-B4

000-0ISB-02

NO2-B4

000-0ISB-03

O3-B4

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: sensors@alphasense.com
Website: www.alphasense.com