Monitoring of artesian conditions in which the piezometric surface is above ground surface or more particularly above the top of well casing elevation using Leveloggers can be quite straight forward.
artesian conditions infer that the piezometric surface never drops
below the level the ground surface or particularly the top of casing
elevation and the casing is sealed with a sealed wellhead. In this case,
where freezing is not a concern, the Levelogger need only be installed
on the wellhead itself by means of a large compression fitting with a
1/4" NPT connector. Solinst can supply a 7/8" nylon compression fitting
for this purpose. First, a 1/4" NPT hole is tapped into the wellhead.
The user slides the Levelogger into the compression fitting, leaving
about 1/4 of the logger body exposed above the fitting. The compression
fitting nut is tightened around the Levelogger. The 1/4" NPT connector
on the bottom of the pressure chamber of the fitting threads into the
hole in the sealed wellhead. The user can communicate with the logger
simply by removing the logger cap and attaching the optical reader.
Ensure that the logger and sealed wellhead are enclosed within an outer
protective well cap or enclosure. This method should only be used in low
pressure conditions (less than 30 psi or 66 ft (20 m) of water column).
conducting artesian monitoring with Leveloggers a number of
considerations must be kept in mind. First, ensure that the maximum
hydraulic pressure the Levelogger will encounter within the well at its
installation point will not exceed the hydraulic range of the logger.
Second, artesian conditions do not preclude the necessity for barometric
compensation of Levelogger data. Artesian conditions are caused by
aquacludes forming confined aquifers. Confined aquifers, while not acted
on by barometric pressure to the same extent as unconfined aquifers,
are typically subject to barometric pressure at some barometric
efficiency. Finally, bear in mind that the total pressure and subsequent
water column equivalent depth measured by the Levelogger after
barometric compensation may not represent the actual water level within
the artesian well. Sealed intermittent artesian wells can be pressurized
when artesian, but can also be de-pressurized when non artesian. The
Levelogger’s reading after barometric compensation represent the height
of the piezometric surface.
Includes 1/4" NPT connector
User can communicate with logger using optical reader
Not recommended for pressures in excess of 30 psi (66 ft, 20m) of water column
What's in the Box:
(1) Solinst 112350 Levelogger Artesian Well Connector Assembly