Categories: Electrochemical Gas sensors
Information：3-Way AFE (designed for use with the A4 air quality sensors)
(1) 2 sensor, 3 sensor or 3 sensor plus PID versions are available. The AFEs are analogue potentiostat circuits with on-board power regulation and reference voltages: there is no digital circuitry on the AFEs.
(2) Power requirement: 650uA per channel; for example, 3 sensor AFE with sensors requires only 2 mA.
(3) Although electrochemical sensors require + and – power supplies, the negative supply is generated on the AFE so you need only supply 3.4 to 6.4 V and analogue ground.
(4) Each AFE includes a Pt1000 with separate circuit board, located next to the centre sensor for correct temperature compensation. Pt1000 output is 1mV/ºC. Offset needs room temperature software calibration.