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Products > Open Channel Flow Measurement > 4200 Series Flow Meters >

 4210 Flow Meter

Ultrasonic level measurement - non-contacting sensor means no scheduled maintenance.

The 4210 Ultrasonic Flow Meter provides non-contact sensing of the flow over a weir or in a flume. The ultrasonic sensor is mounted above the flow stream, and transmits a sound pulse that is reflected by the surface of the flow. The elapsed time between sending a pulse and receiving an echo determines the level in the channel. Automatic compensation for air temperature ensures measurement accuracy.

Because its sensor does not contact the liquid, the 4210 provides long-term dependability with no scheduled maintenance. The Isco 4210 is not affected by chemicals or high concentrations of grease, suspended solids or silt in the flow.

You can retrieve stored data on-site with a laptop PC or an Isco 581 Rapid Transfer Device, or remotely via telephone using an optional modem. Isco Flowlink Software produces a variety of informative graphs and reports from stored data.

Standard Features

  • Built-in flow conversions for most applications, including Manning formula, data points, or equation for special situations.
  • Two-line x 80-character backlit LCD.
  • Built-in dot matrix printer gives you an accurate, on-site printout
  • Internal memory stores over 2 months of flow, rainfall, parameter, and sample data at 15 minute intervals.
  • Automatic gain adjustment in response to echo strength - maximizes performance in the presence of steam, foam, and turbulence.
  • Variable Blanking Distance eliminates false echo problems caused by obstructions such as manhole rungs.
  • Interfacing for Sampler activation, connection to multiparameter water quality sonde, alarm outputs


  • Portable and fixed-site flow measurement with weirs and flumes
  • Pretreatment Compliance
  • Stormwater Runoff Monitoring
  • Permit Enforcement
  • Sewer Flow Monitoring
  • Combined Sewer Overflow Studies
  • Wastewater Treatment Plant Operations
  • Inflow and Infiltration Studies
  • River and Stream Gauging

Options and Accessories

  • Optional telephone modem - provides remote data retrieval, voice messaging, and dial-out alarm conditions
  • Analog Outputs - up to 3 isolated internal 4-20 mA outputs
  • Non-resettable totalizer
  • 674 Rain Gauge
  • 581 RTD data retrieval device downloads up to 20 meters
  • 201 pH module adds pH and temperature measurement/logging
  • YSI 600 Multi-Parameter Water Quality Monitor
  • Suspension equipment (to hang flowmeter in manhole)

Size (H x W x D): 17.0 x 11.5 x 10.5 in. (43 x 29 x 26.7 cm) (without power source)
Weight: 17.3 lbs (7.8 kg) (without power source)
Material: High-impact molded polystyrene structural foam
Enclosure: NEMA 4X (iP65)
Power: 12 to 14V DC, 24 mA average at 12.5V DC
Typical Battery Life (printer set at 1 in/hr, 1 minute level reading interval)
934 NiCad Battery: 7 to 8 days
946 Lead-Acid Battery: 10 to 12 days
948 Lead-Acid Battery: 2 to 2½ months
Program Memory: Non-volatile, programmable flash. Updateable without opening enclosure.
Display: Backlit LCD, 2-line, 80-character (5.5 mm high x 3.2 mm wide)
Level-to-Flow Rate Conversions
Weirs: V-notch, rectangular with and without end contractions, Cipolletti
Flumes: Parshall, Palmer-Bowlus, Leopold-Lagco,Trapezoidal, H, HS, HL
Manning Formula: Round, U-channel, rectangular, trapezoidal Data Points Four sets of 50 level-flow rate points Equation Two-term polynomial
LCD: 9-digit, floating decimal point, resettable
Mechanical (optional): 7-digit, non-resettable
Inputs and outputs
Rain Gauge Input: Contact closure, normally open. Resolution 0.01 or 0.004 in ( 0.25 or 0.1 mm)
Parameter Inputs: pH, dissolved oxygen, conductivity, and temperature (with optional YSI 600 sonde); pH and temperature (with optional Isco 201 Parameter Module); or dissolved oxygen and temperature (with optional Isco 270 Parameter Module)
Sampler Activation Conditions: Enabled, disabled, AND and OR combinations of any two of level, flow rate, rainfall, pH, DO, conductivity, and temperature
Sampler Pacing Output: 12V pulse
Sampler Input: Event mark, bottle number
Recording Modes: Up to 3 graphs of level, flow rate, pH, DO, conductivity, and temperature vs time; includes totalized flow. Rainfall and sampler events (time and bottle number) are also recorded
Speed: Off, 0.5, 1, 2, 4 in/hr (1.25, 2.5, 5, 10 cm/hr)
Recording Span: User selectable with multiple over-ranges
Resolution: 1/240 of recording span
Reports Printed: Flow meter program, 2 independent time interval reports, flow meter history, sampler history
Interval Report Contents: Site number; time interval; total flow; minimum, maximum, and average flow rate, level, pH, DO, conductivity, and temperature, and time of occurrence; interval flow; total rainfall; number of samples, flow meter history and sampler history
Character Size (HxW): 0.09 x 0.07 in (2.4 x 1.7 mm)
Paper: 4.5 in. wide x 65 ft. (11.4 cm x 19.8 m), plain white paper, replaceable roll
Ribbon: 19.7 ft. (6.0 m) black nylon, replaceable
Data Storage Memory
Capacity: 80,000 bytes (approx. 40,000 readings) divided into a maximum of 12 memory partitions. Equal to 100 days of level, rainfall, pH, DO, conductivity, and temperature readings at 15 minute intervals, plus 3,000 sample events. Optional expansion to 473,000 bytes (approx 236,500 readings)
Setup and Data Retrieval: IBM PC or compatible computer with Isco Flowlink 4 for Windows
Communication: Direct connection, optional internal 2400 baud telephone modem with voice messaging
Data Retrieval (optional): Isco 581 Rapid Transfer Device (RTD)
Voice Messaging (with optional internal modem): Calls up to 5 telephone numbers with programmable delay between calls, activated based on AND and OR combinations telephone of any two of level, flow rate, rainfall, pH, DO, conductivity, and temperature
Analog Outputs: (optional) Up to 3 isolated internal outputs, 0 to 20 mA or 4 to 20 mA, scaleable based on level, flow rate, pH, DO, conductivity, or temperature, into a maximum of 750 ohms each
Relay Outputs: 2 form C relays with field selectable trip points based on flow rate (with optional High/Low Alarm Relays)
Serial Output: Current status and readings, in response to command or automatically at selectable time intervals, ASCII comma separated values at 1200, 2400, 4800, or 9600 baud
Storage Temperature: -40° to 140°F (-40° to 60°C)
Operating Temperature: 0° to 140°F (-18° to 60°C)
Ultrasonic Sensor
Length x diameter: 6.9 x 3.6 in (17.5 x 9.1 cm)
Cable Lengthxdiameter: 25 ft x 0.3 in (7.6 m x 0.8 cm)
Weight (incl cable): 2.6 lbs (1.2 kg)
Enclosure: NEMA 4X, 6; IP67
Frequency: 40 kHz
Range (distance from sensor to liquid): Minimum 2 ft (0.6 m); Maximum 12 ft (3.7 m)
Span: 0 to 10 ft (0 to 3 m)
Blanking Distance: 2 to 12 ft. (0.6 to 3.7 m)
Level Measurement Accuracy - at 22°C (72°F), still air, 40 to 70% humidity. Head change is actual change in vertical distance from ultrasonic sensor to liquid surface)
for head change <1.0 ft (<0.31 m): maximum error is ±0.02 ft. (±0.006 m)
for head change of 1.0 to 10 ft (0.31 to 3.05 m): maximum error is ±0.03 ft. (±0.009 m)
Temperature Coefficient: Maximum error over compensated temperature range (per degree of temperature change) ±0.000047 x D per °F (±0.000085 x D per °C) where D is the distance from the transducer to the liquid surface
Operating Temperature: -22° to 140°F (-30° to 60°C)
Compensated Temperature: -22° to 140°F (-30° to 60°C)
Materials: Sensor housing is Xenoy 6120; Cable jacket is Polyvinyl chloride (PVC)

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