| 摘要 |
An outer passive reference resistor loop is printed along the length of an elongated substrate along with an inner active liquid level sensing resistor loop, whereby the reference resistor loop is exposed to exactly the same varying temperature conditions as the active level sensing resistor loop (e.g. in half air/half water), thereby providing superior temperature compensation. An upper plastic substrate carries a elongated conductive strip that is positioned over the first and second legs of the inner resistor loop but not over the legs of the outer resistor loop and wherein the first and second insulated substrates are coupled together providing separation of the substrates in the absence of hydrostatic pressure, and for causing conductive bridging contact by the elongated strip of an electrically conductive material contacting the first and second legs of the inner resistive elongated loop in the presence of hydrostatic pressure. Printed inks produce the resistive loops.
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