Procedure 6.7 – Finding a Missing Magnet
Overview
The volume sensing system in the rover is comprised of a single transducer rod
used for both canisters, and a float magnet and reference magnet for each canister. The
reference magnets are fixed at the bottom of both the large and small canisters, and the
float sensors indicate the present fluid level. The difference between the two readings
indicates the fluid volume for each canister. This information is displayed in the
technician menu in the level sensor data screen.
To determine the position of each magnet, the sensor transmits a signal starting
at the top of the transducer rod (A). The signal is sent at a known speed, so the
distance to the magnet can be determined by timing the response from each magnet.
(Using the formula distance = rate x time). (See Figure 1)
A
B
C
D
E
A Signal Sent From Transducer Rod
B Response From Small Tank Float Sensor
C Response From Small Tank Reference Magnet
D Response From Large Tank Float Sensor
E Response From Large Tank Reference Magnet
Figure 1. Transducer Rod and Magnets
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