The PSL03 is a piezometric level sensor. It sits under the water and measures static pressure, then converts the pressure into a level value. It reads tide level and water table. Its anticorrosion materials are chosen for hypersaline sites. It connects to a SpaceEcho station and reports to EchoCloud.
PSL03 piezometric level sensor lowered into the water (illustration).
Features
Tide and water-table levels
Measured from static pressure under the surface.
Anticorrosion materials
PTFE for sea and chemical water, with a ceramic chip.
Stable over a year
Annual drift of ≤ ±0.2 % F.S.
Fast response
Under 8 ms.
Nothing above the water
No mast or bracket over the surface; only the cable leaves the water.
Specifications
Measuring range
0–5 m
Accuracy
±0.5 % F.S. (±25 mm over the full 5 m)
Annual stability
≤ ±0.2 % F.S.
Response time
< 8 ms
Material
PTFE anticorrosion material; ceramic chip
Output interface
Analog; digital Modbus RS-485
Supply voltage
12–36 V DC
Cable length
Configurable
Choosing a level sensor
A SpaceEcho station can measure water level with three sensor types. The right one depends on the site, the range and the accuracy needed.
Piezometric — PSL03
Submerged. Works where nothing can be mounted over the water, and is not affected by air temperature, fog, spray or foam on the surface. Limits: range of 5 m, accuracy of ±0.5 % F.S., and the probe is in contact with the water, so it needs cleaning and checks against a reference level.
Radar — RW04
Non-contact, from above. Range 0.1–40 m, accuracy ±2 mm, IP68. The measurement does not depend on air temperature or humidity. Limits: it needs a mount over the water with a clear view of the surface. See the Radar Level Sensor.
Ultrasonic — USW02
Non-contact, from above. Range 28–700 cm, accuracy ±1 cm, with built-in temperature and humidity correction. A lower-cost option for level and wave monitoring. Limits: shorter range and a wider error than radar, and the beam (11°) needs a clear path to the water. See the Acoustic Level Sensor.
