CDI-6400 Flowmeter for Compressed Air (2″ - 8″ pipes)


CDI Meters


Our initial ruggedized flowmeter is still available for purchase. We now offer the CDI 5000 Series flowmeters with the same great features and the option for wireless monitoring.

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The Sensor measures: Compressed Air
Output Signal: Milliamp and Pulse outputs (Optional RS-485)
Power Supply: 20 to 28 Vdc (250 mA)
Sensors Accessories Clamps

Flowmeters Overview

CDI flowmeters represent a radical departure from conventional designs. The meter clamps around a pipe with its flow-sensing probes projecting into the pipe through drilled holes. The low cost of the meters makes them ideal for installation throughout an air distribution system.

All of our Flowmeters:

  • Install in minutes
  • Measure mass flow by thermal dispersion
  • Are CE certified and RoHS compliant
  • Have built-in LED displays


  • Easy to install
  • Housing and display rotate to suit piping orientation
  • IP-66 rating; suitable for wet locations
  • Milliamp and pulse outputs
  • Optional RS-485 output for networking

The CDI 6400 is similar to the CDI 6200, except that it has its probes mounted side-by-side in a single ring and it is built for larger pipe sizes. Like the 6200 and the 5000-series meters, it is a thermal mass flow meter in which one probe senses the air temperature and the other is maintained ten degrees above the air temperature. It has the same milliamp and pulse outputs, the same large, bright display, and an optional Modbus RS485 output for networking.

The flowmeter clamps onto a pipe, with two flowsensing probes projecting into the pipe through 3/16 in. drilled holes. It seals directly to the pipe; no cutting or welding is required for installation. Because each flowmeter is made and calibrated for a specific size of pipe, the display indicates flow directly, with no setup or adjustment.

Number of Rings

1 Ring

Material Type

, ,

Nominal Pipe Sizes

2 in. – 8 in., 50 mm – 101 mm, DN50 – DN200


5 percent of reading plus one percent of full scale at an air temperatures from 20 to 120 degrees Fahrenheit (-6.5 to 49 Celsius) and a pressure of 100 psig (7 bar).


Compressed Air, Nitrogen

Operating Pressure

200 psig (14 bar) maximum on Sch. 40 steel and on Type L copper below three inch; consult CDI for other materials and sizes.

Input Power

250 mA at 20 to 28 Vdc

Output Resistance

600 Ohms max.

Exposed Materials

Stainless steel, gold, thermal epoxy and Viton (seal)

Ring Material



Four digit LED display

Response Time

One second to 63 percent of final value

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