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The Shand & Jurs Model 93376 Semi-Automatic Tank Gauge and Sampling Lock has been
designed as an intermediate step between hand gauging and fully automatic tank gauging. The
inherent inaccuracy of hand gauges led to the design of this tank gauge, which entirely
eliminates the human element in the sequence of lowering the tape and bob to the bottom of
the tank in order to obtain an "innage" reading.
In this gauge, a hollow bob is used in place of the conventional plump bob. A spring
mechanism is adjusted against the weight of the hollow bob so that when the bob touches the
tank bottom or datum plate, payout of the tape is automatically stopped and the tape is kept
under constant tension, preventing tipping of the bob or overshooting the gauge. By substituting
a sampling bob for the hollow bob and locking the spring mechanism, the device becomes a
sampling lock.
The Model 93376 is available in cast steel (for working pressures up to 125 lbs.) Other materials
are available upon request. A rubber plug closure valve, which can be closed on the gauge tape,
is used between the gauge and the tank to isolate the gauge head from the tank vapor space during
gauging operations. A gate valve under the rubber plug closure valve is recommended for
all working pressures above 10 lbs., to permit inspection of the unit.
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