pH analyzer operating at high pressure

Hi,
Can anyone plz suggest solutions for measuring inline pH at high operating pressure i.e 40 bar? I have checked various vendors catalogues and found that pH analyzer can work upto max. 27 bar. Can we reduce high pressure to lower one using sample conditioning system and then measure pH online? My concern is that service is sour water with dissolved gases like chlorine, H2S etc. If we reduce pressure then flashing/outgassing could happen and two phase may occur.
 
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