美国SOR 热差开关 T21
2021-09-14 19:28  点击:449
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The Model T21 Point Level Switchuses a thermal differential technique to measure liquid flow,
level or interface by sensing changes in the thermal heat
transfer characteristics of the media where it is located.
The sensor consists of a pair of matched Resistance
Temperature Detectors (RTDs) encased in twin 316
series stainless steel tubes. One RTD is self heated
using a constant DC current. The other sensor is
unheated and provides an accurate ambient process
temperature reference. The thermal differential
created between the heated and reference RTD
pair is a function only of the media with which the
sensor is in contact. The differential is greatest
when no liquid is present (dry condition) and
decreases as liquid quenches the switch sensors
(wet condition).