Assessment of the applicability of a low-cost sensor–based methane monitoring system for continuous multi-channel sampling

Table 1 Total cost of the developed methane monitoring system (US$ in 2019)

Component	Units	Unit cost ($)	Subtotal ($)	Total ($)
Methane monitoring and data acquisition
STC89C52RC	1	1.12	1.12
ADS1115	1	2.73	2.73
ESP8266-12E	1	1.79	1.79
TGS 2611	1	35.84	35.84
MQ-4	1	1.29	1.29
SHT30	1	3.98	3.98
LCD1602	1	2.12	2.12
Components for gas sampling
Three-way solenoid valves	5	2.55	12.75
Vacuum pump (DC 12 V 6 W)	1	15.70	15.70
Relay board	1	1.99	1.99
Other components			5.00
				84.31