It is necessary to use hydrogen sulfide detector to monitor hydrogen sulfide H2S. Because hydrogen sulfide can smell rotten eggs at a low concentration, but when the concentration is high, people can't smell it. If hydrogen sulfide detector is not used at this time, it is very dangerous because H2S is a highly toxic gas.
If there is no other gas to be monitored except hydrogen sulfide in your application site, you can only purchase a single hydrogen sulfide gas detector, which will also be low in cost. If there are other gases to be monitored in addition to hydrogen sulfide in your application site, you should buy a composite gas detector to monitor several gases together. This is also the monitoring scheme of portable gas detector. If you do not monitor many times, or the monitoring range of H2S cannot be completed by using gas detector, you can select hydrogen sulfide detection tube and use gas detection tube to monitor.