Levelogger Series Quick Start Guide
Levelogger Edge Field Measurement
Levelogger Edge Ranges
Each model of Levelogger is rated for a specific submergence depth (Table 1).
The choice of model largely depends on the accuracy of the water level required
and the submergence depth. The selection, however, should be based on the
maximum anticipated water level fluctuation.
Model
Submergence
Depth
Accuracy
Barologger
Air only
±
0.05 kPa
F15, M5
16.4 ft, 5 m
±
0.010 ft, 0.3 cm
F30, M10
32.8 ft, 10 m
±
0.016 ft, 0.5 cm
F65, M20
65.6 ft, 20 m
±
0.032 ft, 1 cm
F100, M30
98.4 ft, 30 m
±
0.064 ft, 1.5 cm
F300, M100
328.1 ft, 100 m
±
0.164 ft, 5 cm
Table 1 - Levelogger Edge Range
Note
The Levelogger Edge
can withstand over-
pressurization of 2 times
the intended range,
e.g. a Model M10/
F30 can accommodate
a fluctuation of 20
meters or 60 feet and
still record pressure.
However, over-range
accuracy is not
guaranteed.
Measurement Fundamentals
Leveloggers
(L)
measure the total
pressure acting on a transducer at their
zero point/sensor. The total pressure
is caused by the column of water lying
above the Levelogger pressure sensor
AND the barometric (atmospheric)
pressure acting on the water surface.
To compensate for barometric pressure
fluctuations and get true height of
water column measurements
(H)
, a
Barologger
(B)
is required, i.e.:
Barologger Edge
A single Barologger can
be used to compensate
all Leveloggers on site,
within a 20 mile/30 km
radius and with every
1000 ft (300 m) change
in elevation.
Levelogger Reading (L)
-
Barologger Reading (B)
=
Height of Water Column (H)
Tip
To adjust all readings in
your Levelogger file to
depth to water
below a
well casing
(d)
, record
a manual water level
measurement using
a water level meter.
This reading should
correspond in date and
time with an actual
Levelogger recording.
Use this as a reference
datum in the Manual
Data Adjustment option
in the Levelogger
Software Data
Compensation Wizard.
Zero Point
H
L
B
d
Verifying Readings
The best recommendation is to
compare barometrically compensated
Levelogger data
(H)
with a measured
depth to water level value
(d)
(using a
Water Level Meter). The deployment
depth of the Levelogger
(D)
, minus the
manual depth to water measurement
(d)
, should equal the compensated
Levelogger reading, i.e.:
D
Deployment Depth (D)
-
Depth to Water (d)
=
Height of Water Column (H)
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