Patent ID: 7837935

Claim:
A portable hydrogen flame ionization gas detector including a joint for joining hydrogen gas running route-forming members to form a hydrogen gas running route, wherein at least one of the hydrogen gas running route-forming members is removably joined to the joint, the joint comprising: a metallic base having an internal space forming a space for ejection of hydrogen gas, wherein at least one end of the metallic base is opened, and at least one ring-like sealing member which comprises an elastic material and which is arranged at an opening edge of the metallic base, wherein a first, removably joined hydrogen gas running route-forming member fixed in a state inserted into a central through-hole of the sealing member and the internal space in such a manner that a hydrogen gas ejecting opening is located within the space for ejection of hydrogen gas formed with the internal space, and the at least one sealing member is squeezed, whereby said first hydrogen gas running route-forming member is joined to the joint, and another wherein a second hydrogen gas running route-forming member is joined to open into the space for ejection of hydrogen gas.