ISCO 4210 Flow Meter (Discontinued)

  • Non Contacting Sensor There is no need for scheduled maintenance
  • Built in Flow Conversions Conversions for the majority of applications, including Manning formula, data points or equations if needed
  • Internal Memory Ability to store over 2 months of flow, rainfall, sample and parameter data at 15 minute intervals
  • Automatic Gain Adjustment In response to echo strength. Maximises performance in the presence of foam, stem or turbulence
Product Options



The 4210 Ultrasonic Flow Meter from ISCO is designed to provide open channel flow measurement in a flume or over a weir, with automatic compensation for changes in atmospheric pressure to ensure accuracy. The non-contact ultrasonic sensor transmits a pulse of sound that is reflected by the surface of the liquid and the time elapsed between sending and receiving determines the level of the liquid in the channel.

As the ultrasonic level sensor does not contact the flow stream, long-term stability is achieved without the need for scheduled maintenance. The 4210 is also not affected by harsh chemicals, grease, silt or suspended solids in the flow.

Stored data can be retrieved with an on-site laptop PC, and Isco 581 Rapid Transfer Device, or remotely using an optional modem. Isco's Flowlink software is required for advanced graphing, reports and analysis of data.

Standard Features

  • 160 character backlit LCD
  • Built-in flow conversions for most applications including data points, Manning formula, or equations if needed.
  • Accurate on-site printouts using built-in dot matrix printer.
  • Large internal memory can store 2 months of flow, parameter, rainfall and sample data taken at 15 minute intervals.
  • Possible false echo problems caused by obstructions such as manhole rungs are eliminated using Variable Blanking Distance.
  • Automatic Gain Adjustment - in response to echo strength. Maximises performance in the presence of foam, stem or turbulence
  • Provides interface for sampler activation - connection to multi-parameter water quality sonde and alarm outputs.

Manufactured by: Teledyne ISCO
Model: ISCO 4210 Flow Meter (Discontinued)

Services offered for this product

  • Sales
  • Rental
  • Installation
  • Calibration
  • Maintenance


Permanent and portable flow measurement for weirs and flumes
Monitoring stormwater runoff
Permit enforcement
Pretreatment compliance
Combined sewer overflow studies
Flow monitoring in sewers
Wastewater plant operations
River/stream gauging
Inflow and infiltration studies


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 Length x Diameter 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 -° 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)