System for monitoring a level of material, device therefor and methods of making the same
US4942351A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 28, 1989 |
| Grant date | Jul 17, 1990 |
| Priority date | — |
| Expiry date | Mar 28, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01F23/0023
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A system for monitoring a level of material held in a confining means, a device therefor and methods of making the same are provided, the system comprising a rotatable reel, an electrically operated motor operatively interconnected to the reel for causing rotation of the reel in either direction of rotation thereof, a flexible support wound on the reel and having a free end, a probe operatively interconnected to the free end of the support to be carried thereby, a brake operatively interconnected to the reel for holding the reel stationary when the brake is in one condition thereof, and a control unit operatively interconnected to the motor and to the brake for causing the brake and the motor to raise and lower the probe by winding up the support on the reel and unwinding the support from the reel, the motor comprising an electrically operated stepper motor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.