581 Rapid Transfer Device

Just plug it in! The 581 RTD automatically retrieves stored data from your Teledyne ISCO instruments

581 Rapid Transfer DeviceThe 581 Rapid Transfer Device (RTD) is the convenient alternative to using laptop computers in the field. Unlike laptop computers, the 581 RTD requires little or no training, so it can be easily used by anyone on your staff. Simply plug the 581 RTD into the port on your ISCO instrument and your flow, rainfall, water quality, and sampling data are quickly transferred to the RTD. There are no additional cables to carry, and no buttons to push. Data transfer is completely automatic. 

Back in the comfort of your office, you can quickly transfer the data from the RTD to your PC for display, storage or printout. Teledyne ISCO offers Flowlink® software​ for analyzing the data collected by your RTD.


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 GuideBrochure
Isco 581 RTD DatasheetDatasheet
581 Rapid Transfer Device Safety and Certification SheetSafety and Certification Sheet
581 Rapid Transfer Device User ManualUser Manual


​​​​​​​​​​​​​​​​​​​​581 Rapid Transfer Device

Size (LxWxD): 5.2 x 3.0 x 1.9 in (13.2 x 7.6 x 4.9 cm)
Weight: 0.44 lbs (0.2 kg)
Material: Polyurethane
Enclosure: NEMA 4X, 6P IP68 (self-certified)
Power: 12V DC, 40 mA average current draw (provided by Teledyne Isco instrument or RTD Power/Data Transfer Cable)
Operating Temperature: 32° to 120°F (0° to 49°C)
Storage Temperature: 0° to 140°F (-18° to 60°C)
Program Memory: Non-volatile, programmable flash; can be updated using a PC and the RTD Power/Data Transfer Cable

Data Storage and Communication

Capacity: Approximately 965,000 bytes (482,500 readings); equal to 24 Teledyne ISCO flowmeters or samplers, each with 120 days of level and rainfall readings at 15 minute intervals, plus 1000 sample events
Cells: Maximum of 255
Compatible instruments: Teledyne ISCO 4100 Series Flow Loggers, 4200 Series Flowmeters, 6700 Series Samplers, 675 Logging Rain Gauge
Data Retrieval: Serial connection via RTD Power/Data Transfer Cable to a computer with Teledyne ISCO Flowlink Software
Baud Rate: 9600

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



Standard Features

  • Large, versatile memory. With storage for over 900,000 bytes of data, a single RTD can typically retrieve data from up to 24 ISCO flowmeters and samplers.
  • Rugged and compact. The Teledyne ISCO RTD is unaffected by submersion, and small enough to fit in your shirt pocket.


  • Automatic data retrieval from ISCO 4100 Series Flow Loggers, 4200 Series Flowmeters, 6700 Series Samplers.

Options and Accessories

  • Flowlink Software. Downloads data from the 581 RTD and all compatible instruments, and generates informative graphs, reports, and summaries from stored data.