MA-033  Rev. 14.0,  12-Nov-18 
 
Hydran* 201i Instruction Manual 
 
o  Maintenance technician  
o  Troubleshooting technician 
o  Field Service and/or Customer Service personnel  
 
•  If  the  equipment  is  used  in  a  manner  not  specified  by  the 
manufacturer,  the  protection  provided  by  the  equipment 
may be impaired. 
•  All  procedures  in this  manual must  be  strictly  adhered to. 
Any deviation from these may cause irreversible damage to 
the  transformer  being  monitored  and/or  the  Hydran  201i 
System and may lead to property damage, personal injury 
and/or death. 
•  Installation  and  maintenance  of  the  Hydran  201i  System 
must be carried out by qualified personnel only. 
This  manual  is  not  a  tutorial  on  combustible  gases  or  water  in  dielectric  oil.  It  is 
assumed that the reader is already familiar with these subjects 
This  manual  applies  to  the  Hydran  201Ti,  Hydran  201i  System  and  to  the  Hydran 
201R Model i. In this manual, the designation “Hydran 201i System” also applies to the 
Hydran  201R  Model  i  and  to  any  other  combination  of  Hydran  201i  components.  The 
components of the Hydran 201i System are described in Section 2.2. 
This Hydran 201i System Instruction Manual is included  in  PDF format in the folder 
English/Manuals of the Hydran 201i System installation CD, along with the Hydran 201i 
System Installation Guide and the Hydran Host Software Manual. A hard copy of all those 
manuals can be purchased from General Electric.