810-1902-03 Rev D TM1 Installation Guide
2
Product Overview
The TM1 is a remotely-deployed transformer monitor which can be safely installed onto an energized
or non-energized transformer to detect and measure dissolved hydrogen found in an electrical power
transformer‘s insulating oil. The monitor is designed and constructed to operate in environmental
conditions in Power Plants, Switchyards or Substations.
The TM1 is directly mounted to an existing valve on the transformer and circulates transformer oil within
it to provide a continuous reading of hydrogen in ppm. Data can be viewed with the supplied TM View
software or via a customer’s SCADA system (RS485 / RS232) using Modbus or DNP3 protocol and will
allow the end user to track the hydrogen ppm levels over time and compare against user-defined
caution and alarm settings.
The TM1 monitor includes two 4-20mA inputs for use with an optional moisture sensor. In addition to
the inputs, there are three 4-20mA outputs. Also included are three user-programmable relays, as well
as relays for service-related conditions and loss-of-power.
The TM1 measures hydrogen (H
2
) without cross-interference from other gases. Hydrogen is formed
under all known thermal fault conditions in the transformer and is one of the first gases to be generated,
making it an excellent early indicator of a broad range of fault types.
Note: The TM1 is designed for use on mineral-oil, FR3 and silicone oils.
The TM1 is designed to be installed and configured by the end-user. Configuration of the monitor’s
alarms, settings and options is accomplished using a PC-based TM1 Configuration Utility Tool
described in greater depth in the TM1 Operation & Maintenance Guide (810-1928-01).
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