If section 66 is selected to be porous, {HEAD ~ the porosity} must be sufficient to enable the deposited first material of the NH3 sensing electrode to make contact with {TAIL ~ the bottom} electrolyte 58 
If section 66 is selected to be porous , { HEAD ~ the porosity } must be sufficient to enable the deposited first material of the NH3 sensing electrode to make contact with { TAIL ~ the bottom } electrolyte 58
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH