TIENet 350/350Ex Area Velocity Sensor with Signature Flow Meter

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TIENet® 350 Ex area velocity sensor
TIENet® 350 area velocity sensor


TIENet 350 Area Velocity Sensor / TIENet® 350 Ex area velocity sensor

The Teledyne Isco TIENet 350 Area Velocity Sensor measures flow stream average area velocity and liquid level.

The new, intrinsically safe TIENet® 350 Ex area velocity sensor, certified for both hazardous and non-hazardous location flow measurement in water and wastewater applications. The intrinsically safe TIENet 350 Ex sensor is certified for use in areas classified as Class I, Div1, Zone 0, Category 1G, Ex ia IIB T4 Ga. When used with a Teledyne ISCO Signature® barrier, the TIENet 350 Ex can also serve in hazardous areas as a standalone flow measurement sensor. The TIENet 350 Ex is compatible with all current sensor mountings found on Teledyne ISCO equipment.

The Signature® Flow Meter uses the information from the 350/350Ex to calculate the flow rate and total flow of the stream. To operate with the 350 sensor, the Signature requires software version 1.18 or later. The 350 sensor is mounted in the flow stream, normally at the bottom of the channel. It measures average velocity using continuous ultrasonic sound waves to produce a Doppler effect, in which the frequency of a wave (such as sound) passed between two bodies is relative to the motion of each. As they move nearer to each other, the frequency increases; as they move apart, the frequency decreases. The 350 sensor measures liquid level using an internal differential pressure transducer.

Signture Flow Meter

The new Isco Signature flow meter is designed for open channel flow monitoring applications. It supports flow measurement technologies including ultrasonic and bubbler. Flow can be calculated using standard open channel level-to-flow conversions, level to flow data points as well as user-defined equations, depending on the needs of the application. Unique features provided by the Signature flow meter help to verify data integrity. It logs key events such as power outages and changes in calibration to validate data accuracy. Stored data can be easily reviewed to detect any type of data alteration.

Manufactured by: Teledyne ISCO
Model: TIENet 350/350Ex Area Velocity Sensor with Signature Flow Meter

Services offered for this product

  • Sales
  • Rental
  • Installation
  • Calibration
  • Maintenance


Industrial Pre-treatment Compliance
Permit Enforcement
Wastewater Treatment Plant Discharge Monitoring
Outfall Monitoring
Shallow Flow Measurement in Small and Large Channels


350 TIENet Sensor Specificationsa
Sensor Dimensions 1.9 x 3.3 x 15.2 cm / 0.75 x 1.31 x 6.00 in
Standard Cable Length 5, 10, or 23 m / 16.4, 32.8, or 75.5 ft
Minimum Bend Radius 15.24 cm / 6 in
Maximum Cabling from Signature Flow Meter 305 m / 1,000 ft

Typical Weight

w/ 5 m Cable

w/ 10 m Cable

w/ 23 m Cable

0.88 kg / 1.95 lb

1.68 kg / 3.70 lb

3.10 kg / 6.84lb

Body Materials Epoxy, PC, SST
Cable Materials UV-Rated PVC

Temperature Range



0 to 70 °C / 32 to 158 °F

-40 to 70 °C / -40 to 158 °F

Power Input


Supply Current @ 12VDC Nominal

7 to 14VDC

Measurement: 100mA

Level Measurement
Technology Submerged differential linear pressure transducer with integral digital temperature compensation coefficients.
Rangeb 0.010 to 3.05 m / 0.033 to 10 ft
Pressure Rating 5 PSI
Maximum Submersible Depth 10.55 m / 34.6 ft
Accuracyc ± 0.10% FS
Typical Long Term Stability ± 0.007m/yr / ± 0.023 ft/yr
Compensated Temperature Range 0 to 70°C / 32 to 158°F
Velocity Measurement
Technology Continuous wave Doppler ultrasonic
Frequency 500 kHz
Transmission Angle 20° from horizontal
Velocity Direction Bi-Directional (User selectable)
Typical Minimum Depth for Velocity Measurement 2.5 cm / 1.0 in
Range -1.5 to +6.1 m/s / -5 to +20 ft./s

Velocity Error

-5 to +5 ft./s: -1.5 to +1.5 m/s ±0.1 ft./s (±0.03 m/s)

5 to 20 ft./s: 1.5 to 6.1 m/s ±2% of reading

a. All specifications are subject to change without notice.

b. Actual vertical distance between the area velocity sensor and the liquid surface

c. Maximum non-linearity, hysteresis, and temperature error from actual liquid level

d. Uniform velocity profile, speed of sound 1480 m/s (4850 ft/s)