G - Physics – 01 – F
Patent
G - Physics
01
F
354/30
G01F 23/00 (2006.01) G01F 23/46 (2006.01) G01P 13/04 (2006.01) H03K 5/26 (2006.01)
Patent
CA 1160346
LIQUID LEVEL. RECORDER APPARATUS AND.METHOD FOR STORING LEVEL DIFFERENCES IN MEMORY Abstract A shaft position recorder apparatus and method are described which can be used for recording changes in liquid levels. The recorder employs an electronic memory for storing the changes in liquid levels which are entered into the memory at predetermined time intervals if they exceed a predetermined magnitude or "deadband". The recorder appa- ratus employs a shaft position encoder as an input means for supplying a group of pulses for each measured change in shaft position or liquid level so that the sequence of the pulses indicates whether the change was an increase or decrease from the previous reading. The preferred shaft encoder includes three reed switches which are operated by four permanent magnets mounted on a support disk which rotates in accordance with the position of the shaft, such shaft being coupled to a float pulley when used as a liquid level recorder. The reed switches are closed in different sequences when the support disk is rotated in opposite directions to produce the groups of pulses on three parallel outputs connected to a computer for analysis to determine if levels change is up or down; and to produce a present level signal. The recorder contains a temporary or scratch pad memory which stores a datum reference signal correspond- ing to the previously measured liquid level signal. This datum reference signal is compared with the present level signal to produce a difference level signal corresponding to the differences in their amplitude which is then compared with a predetermined deadband limit signal to produce an output difference level signal when it exceeds such deadband. The output difference level signal is period- ically gated every 15 minutes to a permanent memory to update the datum reference signal. In addition, the recorder includes a maximum level memory and minimum level memory which continuously monitor the present level signal, temporarily store and transmit maximum and minimum level signals through gates to the permanent memory at the end of a predetermined time period such as every 24 hours.
376031
Bishnoi Indra K.
Lee Harold G.
Leupold & Stevens Inc.
Smart & Biggar
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