Eco / Plus
Water tanks
See the level trend before a refill, outage, or overflow becomes urgent.
Use cases
One monitoring idea. Many real-world jobs.
Plus
Ponds and outdoor assets
Use protected wiring, proper strain relief, and a sensor choice matched to the environment.
Plus
Wells
Use submersible or compatible long-range sensor workflows when top-mounted ultrasonic is not the right geometry.
Eco
Aquariums
Compact monitoring for stable level awareness where mounting and sensor range are appropriate.
Plus
Pools
Track level behavior in outdoor or semi-outdoor installations with the right enclosure, wiring, and sensor selection.
Plus
Existing analog systems
Bring compatible 0–5V, 0–10V, 0–20mA, or 4–20mA signals into the LumeLevel workflow through supported modules.
Pebble can be matched to different monitoring jobs by choosing the correct enclosure, sensor type, mounting method, wiring protection, and measurement workflow.
Pebble sensor selection
Choose the Pebble setup that matches the tank, sensor, and installation environment.
Pebble Eco 1 stands on its own as the direct-ultrasonic main + reserve option. Pebble Eco 2 aligns with Pebble Eco 2 / Pebble Plus in the RS485 sensor arena, while staying limited to one main + reserve pair.
Pebble Eco 1
Direct ultrasonic main + reserve
Best when the site needs a straightforward main + reserve setup using direct ultrasonic sensors mounted above the liquid.
- Main + reserve direct ultrasonic
- Direct ultrasonic sensor pair
Pebble Eco 2 / Pebble Plus
RS485 sensors: 2 tanks vs 6 tanks
Eco 2 is best for one main tank + one reserve tank using RS485 sensors. Pebble Plus is best when the site needs up to 3 main tanks + 3 reserve tanks.
- Eco 2 and Plus support Pebble-A02 and Pebble-A01 RS485 ultrasonic sensors
- Eco 2 and Plus support Pebble-300 submersible sensing
- Eco 2 gets the Eco 2 + Plus sensor family; Plus keeps expandable capacity
Eco 1 sensor
Waterproof ultrasonic
Use for simple non-contact level monitoring where the sensor is mounted above the tank and aimed directly at the water surface.
- Typical measuring distance
- Up to 20-600 cm, depending installation and installed environment.
- Blind spot
- About 20–25 cm near the sensor face
- Tank Top Monitoring
- Adds discrete tank-top monitoring so the system can know whether a tank lid/top has been opened or closed.
- Best fit
- Tanks with open headroom above the liquid
Eco 2 + Plus sensor
Pebble-A02 RS485 ultrasonic
Use when you want non-contact ultrasonic sensing but need a much smaller near-sensor blind zone than the standard Eco ultrasonic option.
- Typical measuring distance
- About 3–450/500 cm depending on model
- Blind spot
- About 3 cm near the sensor face
- Tank Top Monitoring
- Optional via Pebble Tank Top Switch box.
- Best fit
- Lower-clearance tanks where the sensor sits closer to the full level
Eco 2 + Plus sensor
Pebble-A01 RS485 ultrasonic
Use for larger tanks where a longer ultrasonic measuring range is more important than the smallest possible blind zone.
- Typical measuring distance
- About 28–750 cm depending installation and installed environment.
- Blind spot
- About 28 cm near the sensor face
- Tank Top Monitoring
- Optional via Pebble Tank Top Switch box.
- Best fit
- Taller tanks
Eco 2 + Plus sensor
Pebble-300 submersible level sensor
Use when Mounting directly above the fluid is difficult or when a submerged pressure-based reading is preferred.
- Typical measuring distance
- Selected by sensor range, commonly 1 m to 20 m or more
- Blind spot
- No ultrasonic blind spot; sensor measures pressure from below the water surface
- Tank Top Monitoring
- Optional via Pebble Tank Top Switch box.
- Best fit
- Deep tanks, enclosed tops, turbulent top surfaces, or difficult ultrasonic geometry
Eco 2 + Plus module
Pebble Tank Top Module
Adds tank-top, dry-contact, and open/closed state monitoring to Eco 2 or Pebble Plus over the RS485 bus.
- Best for
- Lid-open alerts, tank access monitoring and alarm contacts
- Connection
- Switch inputs connect to the module; the module connects to the RS485 Pebble bus
- Buyer note
- Choose this when you need tank top monitoring in addition to level monitoring
Eco 2 + Plus module
Pebble Analog Module
Connects compatible analog-output sensors to Eco 2 or Pebble Plus. Best for retrofit installations or existing industrial sensors that output voltage or current instead of native RS485.
- Best for
- Existing 4–20mA, 0–10V, and compatible analog level sensors
- Connection
- Analog sensor connects to the module; the module connects to the RS485 Pebble bus
- Buyer note
- For new installations, choose native RS485 when available; use analog for compatibility or retrofit needs
Simple selection guide
Choose Eco 1 for direct-ultrasonic main + reserve installs. Choose Eco 2 when that same two-tank setup needs RS485 sensor choice. Choose Plus when the site needs up to 6 tanks: 3 main + 3 reserve.
FAQ
Questions buyers and installers ask first
Which Pebble model should I choose?
Choose Pebble Eco 1 for two-tank direct-ultrasonic monitoring. Choose Pebble Eco 2 for two-tank RS485 monitoring. Choose Pebble Plus when you need up to 6 tanks: 3 main + 3 reserve, plus RS485 sensors, switch-box workflows, or analog integration.
Can Pebble monitor more than a basic water tank?
Yes. With the right model and sensor choice, Pebble can be positioned for tanks, aquariums, wells, ponds, pools, and compatible existing analog systems.
Does sensor depth matter?
Yes. Measuring depth is sensor-specific. The selected ultrasonic, submersible, or analog transmitter range must match the actual installation depth and environment.
Can existing analog level sensors be reused?
In many cases, Pebble Eco 2 and Pebble Plus can integrate compatible analog signals through a supported RS485 analog acquisition module, after confirming the signal range and calibration points.
Pebble is the bridge between the tank and the decision.
Use Pebble Eco 1 when the two-tank install should stay direct-ultrasonic. Use Pebble Eco 2 when the two-tank install needs RS485 sensor choice. Use Pebble Plus when the job needs up to 6 tanks: 3 main + 3 reserve.