Product Showcase: MQ Sensors: A New video by SparkFun Electronics
Product Showcase: MQ Sensors
Smoke Sensor – MQ-2: https://ift.tt/2G0K3sv
Dual Gas CO and CH4 Detection Sensor – MQ-9B: https://ift.tt/368iJDc
Low Concentration Ozone Gas Sensor – MQ-131: https://ift.tt/3cxTrQ3
Hydrogen Sulfide Gas Sensor – MQ-136: https://ift.tt/3mPv0T3
Ammonia Gas Sensor – MQ-137: https://ift.tt/36i7Qz1
The MQ-2 Smoke Sensor can detect flammable gas in any range from 300 -10000ppm, and the heater uses 5V.
The MQ-9B sensor’s conductivity gets higher as the carbon monoxide and methane gas
concentrations rise. The heater uses an alternating voltage of 5V and 1.5V, depending on the gases. If you’re only testing Carbon Monoxide, the heater can be set to 1.5V. It has a sensing
range of 10-500ppm for methane.
The Low Concentration Ozone Gas Sensor is highly sensitive to ozone, also known as
trioxygen, and oxides like Chlorine & Nitrogen Dioxide. Its sensing range is 10-1000ppm, and the heater uses 6V. The load resistor for this sensor is a lot higher than the other sensors,
100/200k, and it’s incredibly sensitive. It measures in parts per billion rather than parts per
million.
MQ136 & MQ-137 both have heaters that use 5V. MQ-136 senses hydrogen sulfide, and MQ-137 senses Ammonia.