2 INTRODUCTION
This Chapter is an introduction to the Hydran 201i System. A description of the various
components of the system is also provided.
2.1 The Hydran 201i System
The Hydran 201i System is a continuous, on-line, intelligent dissolved gas monitoring
system. Its uncompromising accuracy and reliability, and its features are key to its
worldwide acceptance as a true transformer fault prevention device:
• A direct and continuous combustible gas-in-oil digital reading (0–2,000 ppm H
2
).
• An isolated, analog 4–20 mA output.
• Two adjustable gas alarm set points.
• A System Fail alarm.
• A sensor test feature.
• A very wide temperature range for all-weather outdoor operation.
• An extremely high immunity to electrical surge, radio-frequency interference and
electrostatic discharge.
Besides these essential characteristics, the Hydran 201Ti intelligent dissolved-gas
monitor enjoys the benefits of full digital processing and is equipped with the following
additional high-value features:
• Adjustable hourly and daily gas trend computation (ppm change during the target
period) with alarming.
• History logging of data and events with date and time stamping.
• Serial communications with a host computer (USB or RS-485).
• Networking capabilities (up to 128 units) and modem control.
• Self-test on power-up.
• All-software calibration.
• Remote or local configuration and program upgrading.
• Hydran Host computer software available from General Electric.
• Full stand-alone capabilities when the host computer is not needed.
• Sensor self-test and sensor status.
The Hydran 201i System consists of an Intelligent Transmitter, named the Hydran
201Ti, and a family of Controllers, collectively named the Hydran 201Ci Controllers.
• When the Hydran 201Ti (Intelligent Transmitter) is combined with the Hydran
201Ci -1 (One-Channel Controller), it is called a Hydran 201R Model i (Incipient
Fault Monitor).
• A Hydran 201Ti being used alone or with other Hydran 201Ci Controllers is named
a Hydran 201i System Incipient Fault Monitor.
Both the Hydran 201R Model i and the Hydran 201i System Incipient Fault Monitors
can be networked. The network can be tied to a Supervisory Control and Data
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