Dual Orifice Constant Flow Bubble Gage & Recorder

The Sutron Accubar® Constant Flow (CF) Dual Orifice Bubble Gauge/Recorder, a self-contained, precision device for measuring water levels, water temperature*, suspended sediment* & density* using long established bubble gauge principles, combines the following components into a single package. Ideal for rivers, streams, dams & reservoirs, oceans & industrial areas plus any area where water density changes, eg, tidal & estuary areas.

  • User-set measurement and logging. Version -2 make separate measurements in 2 locations. The Bubbler managers pressure on each orifice line independently so that pressures in one line do not affect operation of the other line.
  • Make measurements in separate channels or separate bodies of water or within the same area as redundant sensors (-2 version)
  • Intall the Bubbler orifice with a vertical separation to get an extended range measurement of up to 50 psi total on a 25 psi unit.
  • The -3 version adds a special ultra-accuate density sensor. The -3 density measurement is more accurate (0.1%) than measurements by separate stage sensors on-site would be.
  • Bubbler is both a logger and a sensor, capable of working as a stand-alone or with other loggers/communcations devices via SDI-12, RS232 and RS485.
  • Flash Log holds over 300,00 readings and allows recording of status, water level data.
  • SDI-12 and RS232/RS485 interfaces provide data to loggers or communications equipment.
  • Dual Orifice CF Bubbler supports MODBUS protocol.
  • RS232 port supports a simple command line mode compatible with HyperTerminal and other communcations devices.
  • RS232 port also provides full access to setup, status and Bubbler data plus easy connection to a modem or radio.
  • Front panel for setting up operating parameters, monitoring performance, testing and examining the log.
  • Self-contained needing only external power and orifice tubing.
  • Long-life desiccant (1 year depending on local humidity and user set flow rate)
  • User-set bubble rate for each line to accommodate a variety of field conditions.
  • User-set configuration of single, dual orifice lices and extended range operation (-2 only)
  • Built-in, precision Accubar® sensor, accuracy 0-20ft. 0.01 ft, 20-57.5ft. 0.05% reading. 50 psi version’s accuracy 20-115.3ft. 0.05% reading.
  • User-configured averaging to filter out waves.
  • User-set auto purge to keep the outlet clear of debris. Sensors auto zero after purge to prevent sensor drift.
  • Redundant data storage when connected to an external logger.




  • Measurements
Two Stage/Level/Pressure measurements, Internal Temp, Battery. -3 version makes one stage/level/pressure measurement and one density measurement. Optional water temperature port.
  • Automeasure Interval
1 sec to 24 hours
  • Stage/Level/Pressure Accuracy
Pressure/stage/Level: 0.05% reading with minimum of 0.01 ft.
  • Measurement Technique
Constant flow bubbler with bubble rate programmable by user. -2 models have dual, independent accubar sensors for measuring 2 levels. -3 models have 1 accubar for level and 1 accubar for measuring the differential pressure (density)
  • Stage/Level/Pressure Range
25 psi, 57 ft, 17 meters; 50 psi, 115 ft,35 meters
  • Density Accuracy
0.1% (excluding orifice spacing error) (-3 model only)
  • Suspended Sediment
0 to 1,000,000 mg/L, accuracy +/- 500 mg/L with 2 ft separation of orifices.
  • Water Temperature Range (optional)
-5 C to + 45C
  • Water Temperature Accuracy (optional)
  • Measurement Technique
Platinum RTD (385 or 392), or Precision thermistor.
  • Maximum Purge Pressure
50 psi or 70 psi based on model
  • Desiccant
Silica Gel, lasts up to a year
  • Outlet
4/6mm tube or 3/8″ tube based on model
  • Enclosure
Fiberglass NEMA-4, IP64, lockable
  • Communication Ports
SDI-12, RS232, RS485
  • Operating Temperature
-25°C to +60°C standard, -40°C to +60°C optional
  • Display Type
2 x 20 LCD with backlight
  • Keypad Type
6 button
  • Memory
  • Built-In Flash
>300,000 readings
  • SD/MMC Card
  • USB
  • Ethernet
  • Clock Accuracy
(at 0°C – 40°C)
  • Power Requirements
8 to 16 VDC
  • Max Current
4 amp for 25 psi unit, 8 amp for 50 psi
  • Average Current
  • Communication Protocols Supported
MODBUS (via RS232 only), SDI-12, command line
  • Programming
via front panel, commandline or SDI-12
  • Device Dimensions
  • Height
15″ (38.1 cm)
  • Length
15″ (38.1 cm)
  • Width
7.5″ (19.1 cm)
  • Weight
20 lbs. (9.1 kg)



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