13.2.2 No Communication when the Host Computer is connected directly or by
Modem to the Hydran 201Ci Controller’s DB-9 or USB Connector ..................... 189
13.2.3 No Communication between the Host Computer and the Network of
Hydran 201i Systems ........................................................................................................... 190
13.3 Hydran 201Ci Controller’s Display is Blank ................................................................................ 190
13.4 Hydran 201Ti and Hydran 201Ci Controller’s Analog Outputs at Zero ............................ 190
13.5 Alarms ..................................................................................................................................................... 191
13.5.1 Fail Alarm is Triggered ......................................................................................................... 191
13.5.2 Fail Alarm Message Displayed in the Hydran Host Software ................................ 191
13.5.3 Intermittent Gas Alarms are Occurring ......................................................................... 191
13.5.4 An Alarm Relay does not Reset, even if the Alarm Condition has
Disappeared ............................................................................................................................ 191
13.5.5 Irregular Gas Readings........................................................................................................ 191
13.5.6 Inaccurate Gas Readings ................................................................................................... 192
13.5.7 Gas Level Reading is Abnormally High .......................................................................... 192
13.5.8 Gas Level is Slowly Decreasing towards Zero............................................................. 192
14 MAINTENANCE ........................................................................................................................ 193
14.1 Cleaning the Enclosure Exterior ..................................................................................................... 193
14.2 Replacing the Fuse ............................................................................................................................. 194
14.3 Replacing the Battery ........................................................................................................................ 194
14.4 Periodic Maintenance ........................................................................................................................ 194
14.5 Historic Data Verification ................................................................................................................. 196
14.6 Dissolved Gas Analysis (DGA) .......................................................................................................... 196
14.7 Hydran 201Ti Verification ................................................................................................................. 197
14.8 Hydran 201Ci Controller Verification ........................................................................................... 199
14.9 Fuse .......................................................................................................................................................... 199
15 DECOMMISSIONING THE HYDRAN 201TI ............................................................................ 200
15.1 Powering Off ......................................................................................................................................... 200
15.2 Cable Disconnection .......................................................................................................................... 200
15.3 Removing the Hydran 201Ti ............................................................................................................ 201
APPENDIX A : TECHNICAL SPECIFICATIONS FOR THE HYDRAN 201I SYSTEM ...................... 202
A.1 Hydran 201Ti Intelligent Transmitter ........................................................................................... 202
A.2 Hydran 201Ci-C Communications Controller ........................................................................... 205
A.3 Hydran 201Ci-1 One-Channel Controller ................................................................................... 207
APPENDIX B : MECHANICAL DRAWINGS ..................................................................................... 211
B.1 Hydran 201Ti Intelligent Transmitter ........................................................................................... 211
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