초록 ▼

A redundant level measuring system comprises a chamber for fluidic coupling to a process vessel whereby material level in the vessel equalizes with material level in the chamber. A float including a magnet in the chamber rises and falls with material level in the chamber. A magnet actuated visual in

A redundant level measuring system comprises a chamber for fluidic coupling to a process vessel whereby material level in the vessel equalizes with material level in the chamber. A float including a magnet in the chamber rises and falls with material level in the chamber. A magnet actuated visual indicator is mounted to the chamber for indicating level of the magnet in the chamber. A measurement instrument includes a probe and a measurement circuit. The instrument is mounted atop the chamber with the probe extending downwardly into the chamber. The measurement circuit measures a characteristic of the probe representing level of the material in the chamber. A shield in the chamber isolate the float from the probe.

대표청구항 ▼

A redundant level measuring system comprises a chamber for fluidic coupling to a process vessel whereby material level in the vessel equalizes with material level in the chamber. A float including a magnet in the chamber rises and falls with material level in the chamber. A magnet actuated visual in

A redundant level measuring system comprises a chamber for fluidic coupling to a process vessel whereby material level in the vessel equalizes with material level in the chamber. A float including a magnet in the chamber rises and falls with material level in the chamber. A magnet actuated visual indicator is mounted to the chamber for indicating level of the magnet in the chamber. A measurement instrument includes a probe and a measurement circuit. The instrument is mounted atop the chamber with the probe extending downwardly into the chamber. The measurement circuit measures a characteristic of the probe representing level of the material in the chamber. A shield in the chamber isolate the float from the probe. ate sensor as claimed in claim 1, wherein the first heat transfer member extends to at least the vicinity of the central portion on the section of the pipe line. 4. The flow rate sensor as claimed in claim 1, wherein the first base portion comprises an inner portion having elasticity and an outer portion disposed around the inner portion. 5. The flow rate sensor as claimed in claim 1, wherein a cavity is formed in a central portion of the first base portion. 6. The flow rate sensor as claimed in claim 1, wherein the first heat transfer member has a plate form, and the flow rate detector is joined to a portion of the first heat transfer member located in the first base portion. 7. The flow rate sensor as claimed in claim 1, wherein a seal member for the pipe line is interposed between the first base member and the casing. 8. The flow rate sensor as claimed in claim 1, wherein a device accommodating portion is formed in the casing at the outside of the unit retaining portion, a wiring board is disposed in the device accommodating portion. 9. The flow rate sensor as claimed in claim 8, wherein the device accommodating portion is covered by a lid portion. 10. The flow rate sensor as claimed in claim 1, wherein the dimension of the first heat transfer member in the direction of fluid flow in the pipe line is larger than the dimension in the direction perpendicular to the direction in which the first heat transfer member extends into the section of the pipe line and perpendicular to the direction of fluid flow in the pipe line. 11. The flow rate sensor as claimed in claim 1, wherein the flow rate detector comprises a thin-film heating element and a flow rate detecting thin-film temperature sensing element disposed so as to be affected by the effect of the heating of the thin-film heating element, the thin-film heating element and the flow rate detecting thin-film temperature sensing element being formed on a first substrate. 12. The flow rate sensor as claimed in claim 11, wherein the first heat transfer member is joined to the first substrate. 13. The flow rate sensor as claimed in claim 11, wherein the thin-film heating element and the flow rate detection thin-film temperature sensing element are laminated on a first insulating layer which is laminated on a first surface of the first substrate. 14. The flow rate sensor as claimed in claim 13, wherein the first heat transfer member is joined to a second surface of the first substrate. 15. The flow rate sensor as claimed in claim 1, further comprising a temperature detecting unit retained by the unit retaining portion other than that for retaining the flow rate detecting unit, the temperature detecting unit including a temperature detector for detecting the temperature of the fluid in the pipe line for compensation when the flow rate of the fluid in the pipe line is detected. 16. The flow rate sensor as claimed in claim 15, wherein the temperature detecting unit comprises said temperature detector, a second heat transfer member provided to the temperature detector, a second electrode terminal electrically connected to the temperature detector and a second base portion made of synthetic resin, the second base portion is retained by the unit retaining portion other than that for retaining the flow rate detecting unit, the second heat transfer member extends from the second base portion into the pipe line, and the second electrode terminal extends from the second base portion to the opposite side to the pipe line. 17. The flow rate sensor as claimed in claim 16, wherein the second heat transfer member extends to at least the vicinity of the central portion on the section of the pipe line. 18. The flow rate sensor as claimed in claim 16, wherein the second base portion comprises an inner portion having elasticity and an outer portion disposed around the inner portion. 19. The flow rate sensor as claimed in claim 16, wherein a cavity is formed in a central portion of the second base port