TELKOMNIKA Telecommunication, Computing, Electronics and Control
Analytical determination of load resistance value for MQ-series gas sensors: MQ-6 as case study

TELKOMNIKA Telecommunication, Computing, Electronics and Control
Analytical determination of load resistance value for MQ-series gas sensors: MQ-6 as case study

Liquid petroleum gas
MQ-6 gas sensor
Sensor circuit sensitivity
Sensor power dissipation
Sensor resistance

The MQ-series gas sensors are attractive candidates in the area of gas
concentration sensing due to their high sensitivity and low cost. Even though
the sensor circuit sensitivity and sensor power dissipation level both depend
on load resistance, the process of the load resistance selection has not been
well researched, hence the need for this study. The derivation of model
equations for determining the sensor circuit sensitivity and sensor power
dissipation is presented. The derived equations were used to investigate a
typical scenario of MQ-6 gas sensor under the influence of liquified petroleum
gas (LPG). The variation of sensitivity with load resistance and that of power
dissipation with sensor resistance were parametrically investigated. The load
resistance that yields maximum sensor circuit sensitivity with the maximum
sensor power dissipation less than the set threshold is the candidate resistance
for the sensor circuit. The 20 kΩ load resistance recommended for MQ-6 in
the datasheet was authenticated in this study, yielding the maximum possible
sensor circuit sensitivity and tolerable sensor power dissipation of 0.195
mV/ppm and 3.125 × 10−4 W, respectively.

Ajiboye A. T., Opadiji J. F., Yusuf A. O., Popoola J. O.

http://journal.uad.ac.id/index.php/TELKOMNIKA

Nov 25, 2020

peri irawan

pdf

english

text