Figure 3-2: Internal View of Hydran 201Ti
3.4.1 Brass Adapter
The Hydran 201Ti and the Hydran 201 sensor mount onto the valve of the
transformer or other electrical equipment using a flanged brass adaptor (item 1 in Figure
3-2 above). This adaptor has male threads at one end that screw directly onto the
transformer valve, and female threads at the other end to which the sensor is screwed.
The heating plate of the H201Ti’s enclosure bolts onto the adaptor flange. The H201Ti
can thus be installed or replaced without removing the adaptor and the sensor from the
transformer valve.
The standard brass adaptor (Figure B-3 in Appendix B) has a 1.5-in NPT male thread
(internal diameter of 38 mm) on the valve side. It can also be purchased from General
Electric with 1- or 2-in NPT sizes (25 or 51 mm) male thread (Figure B-4 and Figure B-5 in
Appendix B). The female threads of the adaptor are 1-in NPT (25 mm) to adapt to the
threads of the H201 sensor.
A finned high-temperature adaptor (1.5-in NPT only) can also be purchased (see
Figure B-6 in Appendix B) to increase the maximum operating temperature of the H201Ti.
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