ISCO 4220 Flow Logger with pressure transducer for open channel flow


  • Built-in Conversions Built-in level to flow conversions for most applications
  • Choice of Level Measurement Range Option of standard 10ft or extended 30ft level measurement range
  • Easy to Install The probe is easy to install in round pipes and manhole inverts using Isco mounting rings
  • Reliable and Accurate Probe Submerged probe accuracy is unaffected by
Product Options



The Isco 4220 Flow Logger measures depth using a differential pressure transducer. The venting system compensates for atmospheric pressure changes automatically and can measure pressure accurately even when covered with sand or silt. The 4220 can provide accurate measurement at sites where steam, wind, foam, air temperature fluctuations, or turbulence exists.

Most flumes are available with an integral recess that can be used for mounting the submerged probe. Installation of the probe in manhole inverts and round pipes is made easy with Isco mounting rings. The Isco Street Level Installation Tool can be used for installing the 4220 from ground level, elimination the need for costly and potentially hazardous manhole entry.

Standard Features

  • 160 character backlit LCD
  • Built-in flow conversions for most applications including data points, Manning formula, or equations if needed.
  • 10ft (standard) or 30ft (extended) level measurement range.
  • 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.
  • Venting system provides automatic atmospheric pressure compensation.
  • Provides interface for sampler activation - connection to multi-parameter water quality sonde and alarm outputs.

Manufactured by: Teledyne ISCO
Model: ISCO 4220 Flow Meter (DISCONTINUED)

Services offered for this product

  • Sales
  • Rental
  • Installation
  • Calibration
  • Maintenance


Pre-treatment 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


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)
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)
Storage Temperature -40° to 140°F (-40° to 60°C)
Operating Temperature 0° to 140°F (-18° to 60°C)
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 8 to 11 days
946 Lead-Acid Battery 12 to 16 days
948 Lead-Acid Battery 2 1/2 to 3 months
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);
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)
Submerged Probe (continued)
Compensated Temperature 32° to 100°F (0° to 38°C)
Level Measurement Range 0.1 to 10 ft (0.03 to 3.05 m)
Maximum Allowable Level 20 ft (6.1 m)
Col one Col five
Col one Col five
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 (Maximum 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)
Submerged Probe Type 316 stainless steel, chlorinated polyvinyl chloride (CPVC
Cable Polyvinyl chloride (PVC)



Yes, the ordering process is very easy. Orders can be made via purchase order or by credit/debit card. Once we have the paperwork we can delivery next day to any location in Europe. Provided with the equipment is a quick start guide, and if you need extra support, the technical support engineers can be contacted via phone call.
No, all of our flowmeters are competitively priced and rental is an ideal option for cutting costs to a fraction of a full priced new flowmeter.
No problem. The quick start guide is designed to make installing the flow meters a simple task. Everything you require for set up will be found in the peli-box supplied with the flowmeter.
Every flow meter is tested upon shipping and return as part of our ISO9001 procedure. Also, as part of this procedure, the flow meter is calibrated once a year. If a copy of the calibration certificate is needed let us know.
The flow meters typically provide an accuracy of ±1 to 2% of rate, so if you are measuring 100l/sec then the accuracy is between 98-102l/sec.
We are here to help. If the self-help and quick start guides do not help, then call one of our technical support engineers on +44 (0) 1527 882060. We have supplied and supported many clamp on rental installations throughout Europe.
First, contact us for a quote. If you are happy with the quote then send us a purchase order. Or alternatively call us with credit card details and fill out and send us a rental agreement form.
If the stock is permitting, and all paperwork is received by 12pm then flow meters can usually be available the next day.
The minimum hire period for flow meters is one week.
Once you have the meter you can rent it for as long as you need it. However, it would help if you can let us know that you wish to extend the rental period. Upon return the meter is off-hired and once checked and tested, an invoice will be issued to you. Also, if you extend your rental past a 4, 8 or 12 week rental threshold, then you are entitled to a discount.
You are only charged for the period of time for which you have the flowmeter. So, if a flowmeter is returned 3 days late you are only charged for 3 extra days, and each of these days is charged at one fifth of the weeks hire cost.
Normally, you will use your own courier but if you have any problems let us know and we can arrange a pick up the day after you notify us, but you will be charged for the carriage and this cost will be added to the invoice.
Without exception, all our flow meters are tested. If you need a 110v plug instead of the standard 230v plug let us know.
All of our standard transducers will do -40degC to +150degC, but this will depend on your application.
  • Liquid: below 50mm CFLP transducers are required, 50-1000mm CRS-402 transducers and 150-8000mm CRS-401 transducers. All the bits you need can be supplied, and delivered with the meter.
  • Gas: below 80mm CRS-402 is required, for 80-300mm the CRS-401/CRV-310 and for above 300mm the CRW-312 transducers are required.
  • High temperatures: For liquid we can measure +450degC for liquid and for gas/steam +250degC. But please consult RS Hydro.
Of course, we make a small surcharge for each set of transducers. Most applications only require one set, but on occasion some people may require two, for more diverse pipe sizes and applications.
An ultrasonic wall thickness gauge, that measures to within 0.05mm, is provided as standard with all flow meter rental packages.
The screendump facility on the integrated dataloggers on all our flow meters, allows you to photograph any screen and download it to your pc.
After the equipment has been shipped, it is the responsibility of the hirer. However, in our experience it is rare that any of our flow meters are damaged. Our flow meters are tough, as well as accurate, and reliable.
We have hired more ultrasonic clamp on flow meters than any other company in Europe. We are now one of the world's largest distributors of GE Panametrics flow meters. We always review your application before hire so no unwanted surprises are encountered. Every effort has been made to make your flow meter hire and enjoyable experience: quick start guides to help you set up with ease, online videos for further help, rugged packaging for extra durability anywhere, and real flow engineers available for online/telephone support.