Small Gas Flow Explosion Proof Sampling Pump


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It's hard for me to find a sampling pump in a gas sampling system for analysis instruments. The requirements are as below:

1) Explosion-proof requirement (media: gas mixed with hydrogen);

2) Fit for 1/4"OD sampling line;

3) The max. discharge flow: no greater than 13 L/h.

These three conditions must be followed at the same time. Could anyone help me recommend a suitable sampling pump for hydrogen/oxygen analyzer use in the downstream?