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- [ AXSYS
Datalogger ]
- [ Levelogger
Series ]
- [ Pressure
Transducers:
SDI Depth Sensor ]
- [ Pressure
Transducers:
Submersible
Depth
Transmitter II ]
- [ Type
A-71 Chart
Recorder
]
- [ Type F
Water Level
Recorder ]
- [
Unidata
6541 Precision
Water Level
instrument
]
- [ Water Level
Meter ]
The Stevens Type F Water Level Recorder was
introduced in the 1930's. It quickly became a favorite with hydrologists
and technicians who appreciated its accuracy, compact size, portability
and low cost. Through the years, many improvements have been made to the
Type F Recorder, and its worldwide acceptance has grown. Today the Type F
is the most versatile of all Stevens water level instruments and is an
inexpensive, accurate recorder for general-purpose use.
Flexibility
The Type F is a
labor and time-saving instrument for permanently recording the varying
level of any liquid surface. Flow data may also be obtained when it is
used with weirs, flumes or where water level is an index of flow.
Additional non-typical uses include special magnified recording ratios for
ground subsidence and earth movement studies.
Convenience
The movement of
the float on fluctuating water surfaces causes the chart drum to be turned
proportionally as the timer-controlled pen moves across the chart at a
constant speed. The resulting graph shows the water level against a record
of time. The range in stage is limited only by the length of the float
line and float size, since the chart drum may make any number of
revolutions. The ball-bearing mounted chart drum responds to 0.01 foot (3
mm) changes at 1:1 scale, using a 5 inch (127 mm) float. The instrument is
actually sensitive to 0.002 foot (0.6 mm) and can record to that degree of
accuracy with a large enough float. The cast metal base has four legs for
support. A sheet metal cover, with convenient carrying handle, can easily
be removed for servicing.
Features
- Compact, portable, self-contained power
- Choice of timers: Quartz Multispeed, AC synchronous motor
- Easy field conversion to vary recording ratio
- English or metric models
- Flexible and adaptable for many applications
- Time-proven design