Monitoring Air Flow of Hydrogen and Methane Gases

A system integrator in California recently needed to monitor air flow of hydrogen and methane gas, requiring threaded connections to a steel line that the gases flowed through, as well as from the flow sensing device to the transmitter reading flow for their system controller. Hydrogen and methane are difficult gases to deal with, requiring a robust solution to monitor flow through the exhaust line without potentially posing a hazard. 

In order to resolve these problems, the Dwyer team suggested the DS-300-6-LV In-Line Flow Sensor. A specially sourced stainless steel process fitting would fulfill the chemical compatibility needs of the methane/hydrogen process gas mixture, while a Series 3100D Explosion-proof Transmitter would be able to safely read differential pressure-based flow from the DS-300 pitot tube.

In-Line Flow Sensor, Series DS-300-LV

The Series DS was an ideal solution, as the sensor could be threaded into the existing exhaust plumbing and would meet the chemical compatibility requirements of both the hydrogen and methane gases. The DS-300-6-LV also supplied threaded connections for a differential pressure transmitter, minimizing the risk of gas leakage. The 3100D works well with this application because its stainless steel wetted materials are compatible with the gas mixture in the exhaust line, and it also provides hazardous location ratings required for potentially explosive environments.

Explosion-proof Differential Pressure Transmitter, Series 3100D

Dwyer Instruments offers several products on our website which are safe for use with gases like hydrogen and methane. Please refer to the specifications to determine what product or model is best for your application.

If you have any questions, the Dwyer Applications Engineers are available to assist by phone at (219) 879-8000 x6402, or by email at