Greyline Stringray 2.0 Portable Level Velocity Logger

Stingray 2.0 is a compact, battery-powered logger with an ultrasonic sensor. It data logs level, velocity and water temperature readings for flow monitoring through open channels, partially full sewer pipes and surcharged pipes. Use it for flow surveys I&I studies, stormwater, irrigation water and sewage.

Singray 2.0 uses a submerged ultrasonic sensor to continuously measure both velocity and level in the channel. The sensor is a completely sealed ultrasonic unit with no orifices or ports. It is hydronamically shaped and designed to shed deposits and stringers for reliable operation in sewage, stormwater and stream flow applications. The QZ02L sensor mounts inside the pipe or at the bottom of an open channel. No special compounds, tools or hardware required. A stainless steel mounting bracket is included.

With 4 standard alkaline D-cell batteries the Stingray 2.0 will operate for up to 4 years! These inexpensive alkaline batteries are available in most shops and with an extremely low self discharge rate they will relibaly power the energy efficient Stingray 2.0 for the duration of your flow study.

The unit stores 130,000 data points including level, velocity and water temperature. Between readings it powers down to conserve energy.

You can check operation with the built-in LCD bar graph display. It scrolls through level, velocity and temperature readings, plus remaining battery and logger storage capacity. The display turns off automattically after 60 seconds to preserve battery power.

  Another Article:



  • Flow Surveys
  • Inflow & Infiltration Studies
  • CSO Monitoring
  • Stormwater Runoff
  • Irrigation Water
  • Permit Compliance
  • Wastewater Treatment
  • Plant Flow Studies


  • Measures water level and velocity in partially filled pipes and open channels
  • No flume or weir required
  • Extreme low power consumption
  • Uses standard alkaline D-cell batteries
  • 130,000 point data logger
  • USB output
  • Powerful Windows software
  • LCD bar graph display


General Specifications

Electronics Enclosure:Watertight, airtight, dust proof ( 67) polycarbonate IP
Accuracy:Level: ±0.25% of Range. Velocity: ±2% of Reading
Display:LCD displays: Level, Velocity, Water Temperature, Battery and Memory capacity
Operating Temp. (electronics):-4° to 140°F (-20° to 60°C)
Instrument Set-up:via Greyline Logger software for Windows: Logging Time Interval, Site Name
Logger Interval:

10 sec (15 days), 30 sec (45 days), 1 min (3 months), 2 min (6 months), 5 min (1 year),

10 min (2 years), 15 min (3 years), 30 min (4 years) or 60 min (4 years)

Data Logger Capacity:130,000 data points
Power:4 Alkaline 'D' cell batteries
USB Cable:3 1 shielded ft ( m)
Software:Greyline Logger for Windows. Supports real-time monitoring, log file download and export, graph and data table presentation, level/velocity to flow conversion
Approximate Shipping Weight:10 lbs. (4.5 kg)

QZ02 Sensor L

Velocity Measurement Range:0.1 to 12.5 ft/sec (0.03 to 3.8 m/sec) in fluids containing bubbles or solids with a minimum size of 100 microns and a minimum concentration of 75 ppm to act as acoustic reflectors
Level Measurement Range:Minimum Head: 1 in (25.4 mm). Maximum Head: 15 ft. (4.5 m)
Operating Temperature:5 to 1 °F (-15 to °C) 75 80
Exposed Materials:316 stainless steel, polyurethane, epoxy
Sensor Cable:25 ft. (7.6 m) submersible polyurethane jacket, shielded, 3-coaxial
Sensor Mounting:includes - stainless steel mounting bracket MB QZ
Temperature Compensation:Automatic, continuous


Sensor Cable Extension:shielded 50 ft. (15 m) submersible, polyurethane jacket with watertight connectors
Sensor Mounting Bands:Stainless steel sensor mounting bands for pipes from 6” to 72” (150 to 1800 mm)
Extended Temperature Sensor:QZ HT CPVC 02L- , construction rated to 175°F (80°C)

Download Datasheet: Greyline Stringray 2.0 Portable Level Velocity Logger

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