|WL650 SONIC WATER
Polluted Well Level Meter & Depth Measuring Monitor
Accurate water level measurements
Obtain measurements in seconds
No equipment to clean
Works in cased steel or PVC-capped wells, partially cased rock wells, crooked
wells, and wells with pipes, wiring, and operating pumps
Sonic Water Level Meter Product Description
Global Water's WL650 Sonic Water Level Meter is a self-contained, battery
operated meter that uses sound waves to measure well water level. Fast,
accurate measurements are possible in the field or anywhere without the use of
down-hole water level meters. The Sonic Water Level Meters are
lightweight, compact, versatile, and easy to operate.
The water level meter allows you to measure crooked wells, wells with cascading
water, partially cased rock wells, wells with submersible pumps, capped or
uncapped wells, wells with pipes and wires inside, in fact you can even measure
the length of coiled pipe with the water level meter. As long as the
obstructions take up no more than half of the bore area the meter will not
suffer any loss of accuracy. The sonic water level meter should only be
used on wells under 10 inches in diameter as the accuracy decreases with larger
Sonic Water Level Meter Operation
The WL650 Sonic Water Level Meter is simple to operate. Select either the
NORMAL (10-500 feet) or DEEP (200 to 1,200 feet) setting on the DEPTH
switch. Then, to measure a capped well, simply insert the duct into the
5/8 inch wide access port and push the power-on switch. In a few seconds
the water level will appear on the water level meter's digital display.
In the NORMAL setting, the sonic water level meter stays activated for 5
seconds or 5 pings. Using the DEEP mode, the water level meter emits 4
pings in 16 seconds. For more measuring time, hold the sonic water level
meter's switch down as long as necessary.
Ignore distance feature
The factory distance default values for the sonic water level meter are 10 ft (
3 meters) in Normal mode and 200 ft (60 meters) in Deep mode. If problems
occur due to reflections from liners that don't come all the way to the top of
the casing or unwanted signal returns from such things as pitless adaptors and
such that interfere with getting a proper reading the water level meter's
default values can be increased so that returns within that distance are
ignored. Also, if you are making draw-down measurements that require the
use of the sonic water level meter's deep mode but you wish to be able to
measure to less than 200 ft (60 meters) you can reduce the minimum distance
accordingly so that you don't have to switch modes during the test.
For uncapped wells, use the provided cover plate, which slips onto the
measuring duct and provides a seal for up to 6-inch diameter casings.
Cover plates for larger diameters can be easily fabricated from plastic or
Gain/Sensitivity - "Which Gain Setting to Use, Fixed or Variable?"
The Variable gain mode provides, in effect, a rising gain or sensitivity with
time. This method gives greater weight to return signals that occur later
in the measurement cycle and is beneficial on deeper wells where the return
signal is more attenuated. This also makes the units less susceptible to
unwanted returns from various surfaces in the well casing that might interfere
with a proper measurement.
The Variable gain mode is somewhat more susceptible to interference from pump
noise or other sources of high ambient noise. Also, in some specific
configurations it is possible for the unit to favor a secondary return over the
primary one and give a reading that is twice the actual water level.
The Fixed mode is less susceptible to interference from ambient noise and the
secondary return problem. This mode can be used to advantage in such
cases. Some sensitivity is sacrificed so the unit might not read the
deepest water levels in this mode.
Obtaining an accurate measurement with the sonic water level meter requires
that the temperature setting on the meter be equal to the average air
temperature inside the well casing. The temperature setting corrects for
the variation of the velocity of sound with the air temperature in the well
bore. The sonic water level meter's temperature toggle switch adjusts the
temperature setting for the variation of sound velocity in the well
casing. The value set shows on the display and is retained until changed.
The correct temperature setting can be determined by using the TEMPERATURE MAP
TABLE provided with the water level meter for the state where the meter will be
used (temperature settings are provided for all states in the United
States). Alternatively, the reverse side of the map table has a LOOK-UP
TABLE giving the setting if the well water and average monthly surface
temperatures are known.
Please note: The outside or ambient air temperature does not affect the water
level meter operation, provided the meter and its components remain within the
operating temperature range.
Sonic Water Level Meter Specifications
Measurement range: Normal 10-500 ft (3-152 m), Deep 200-1200 ft (61-366
Display resolution: 0.1 ft
Measurement accuracy: ±0.2% of reading. Exclusive of temperature
setting errors. *
Operating temperature: 30 to 140° F (-1 to 60° C)
Power: 8 AA dry cell batteries
Dimensions (LxHxW): (excluding sonic measuring duct) 7x4x5 in (18x10x13
Sonic measuring duct diameter: 5/8 in (16mm)
The hole diameter must be at least large enough
for 1/2 inch pipe thread.
Sonic measuring duct length: 2 in (5 cm)
Weight: 3 1/2 lbs. (1.5 kg)
* Under certain conditions, accuracy may exceed this limit; when the well
casing is discontinuous; when the well casing is highly corroded or rough; when
large obstructions e.g. pipe joints or wiring exceed half the area of the well
casing; if the well casing is less than 2 inches (5 cm) or greater than 10
inches (25.4 cm) in diameter.
Sonic Water Level Meter Options & Prices
Prices listed are for United States and Canada only. Call or e-mail us
for pricing in other countries.
Terms and Conditions
WL650 Sonic Water Level Meter (PN# AM0075)
WATER LEVEL METER ACCESSORIES
WL610 Case for Sonic Water Level Meter (PN# AM0100)