720 Submerged Probe Flow Module

Submerged probe accuracy unaffected by wind, steam, foam, turbulence or air temperature change

720 Submerged Probe Flow ModuleThe probe on the Isco 720 is mounted at the bottom of the channel, and uses a differential pressure transducer to measure the level of the flow stream. The 6712 Sampler then converts this depth measurement into flow rate. The probe's venting system automatically compensates for changes in atmospheric pressure to maintain accuracy. The 720 provides accurate measurement at sites where wind, steam, foam, turbulence or air temperature fluctuations exist. The probe is suitable for small channels, and accurately senses pressure even when covered with silt and sand. 

Isco mounting rings make it easy to install the probe in round pipes, manhole inverts, and other open channels. And with the Isco Street Level Installation Tool, you can install your monitoring system from ground level, eliminating the costs and hazards of entering manholes. Most flumes are also available with an integral recess for mounting an Isco Submerged Probe.


When you purchase instruments from Teledyne ISCO, you not only receive innovative, high quality products, you also receive excellent customer service and product support. Your initial purchase is only the beginning of Teledyne ISCO's ongoing commitment to their customers.


Teledyne ISCO Water & Wastewater Product Guide
Isco 720 Submerged Probe Flow Module DatasheetDatasheet
Isco Stormwater Monitoring GuideOther
Sampler Selection Guide (2014)Other
Sampler Source BookOther
720 Submerged Probe Module User ManualUser Manual


​​​​​​​​​​​​​​​​​​720 Submerged Probe Flow Module

Size (HxWxD): 4.9 x 5.7 x 2.0 in (12.4 x 14.5 x 5.1 cm)
Weight: 1.1 lbs (0.5 kg)
Material: Polystyrene
Enclosure: NEMA 4X, 6 IP67
Power: 9 to 14V DC (provided by 6700 Series Sampler)
Program Memory: Non-volatile, programmable flash; can be updated via interrogator port on 6700 Series Sampler using a PC
Operating Temperature: 32° to 120°F (0° to 49°C)
Storage Temperature: 0° to 140°F (-18° to 60°C)

Submerged probe

Dimensions: 9.5 x 0.875 in (24.1 x 2.2 cm)
Cable: Standard range probe - 25 ft x 0.3 in (7.6 m x 0.8 cm); Extended range probe - 50 ft x 0.3 in (15.2 m x 0.8 cm)
Level Measurement Method: Submerged pressure transducer mounted in the flow stream
Transducer Type: Differential linear integrated circuit pressure transducer
Operating Temperature: 32° to 160°F (0° to 71°C)
Compensated Temperature: 32° to 100°F (0° to 38°C)
Materials: Type 316 stainless steel, chlorinated polyvinyl chloride (CPVC); PVC Cable
Level Measurement Range: 0.1 to 10 ft (0.03 to 3.05 m)
Maximum Allowable Level: 20 ft (6.1 m)
Level Measurement Accuracy (at 25°C (77°F) - Max error (±) for indicated level range) ​
0.1 to 5.0 ft (0.03 to 1.52 m): ±0.01 ft (±0.003 m)
0.1 to 7.0 ft (0.03 to 2.13 m): ±0.03 ft (±0.009 m)
0.1 to 10 ft (0.03 to 3.05 m): ±0.10 ft (±0.03 m)
Temperature Coefficient (Max error per degree of temperature change over compensated range) ​
0.1 to 4.0 ft (0.03 to1.22m): ±0.005ft/°F (±0.0027m/°C)
4.0 to 10 ft (1.22 to 3.05m): ±0.007ft/°F (±0.0038m/°C)

​For a full list of product specifications, see the datasheet.



Standard Features

  • Submerged probe accuracy unaffected by wind, steam, foam, turbulence or air temperature change
  • Built-in flow conversions for most applications, including weirs and flumes, Manning formula, data points, or equation for special situations.
  • During the program’s operation, current flow and level values are viewable on the sampler's LCD display.
  • All flow data stored in the sampler is available for later retrieval, reporting, and graphing using Isco Flowlink software.


  • Flow measurement where wind, steam, foam, or turbulence exist.
  • Triggering the 6712 sampler based on flow or level.
  • Collecting flow proportioned samples.
  • Treatment capacity analysis
  • Stormwater monitoring
  • Combined sewer overflow studies
  • Long-term river and stream gauging

Options and Accessories

  • Mounting rings and sensor carrier for installing probe in round pipes from 6 to 15 inches in diameter
  • Scissor rings for installing probe in round pipes from 18 to 60 inches in diameter
  • Mounting plate for installation in irregular channels