CDI 5100 In-Line

Price: $525 – $575 each

The CDI 5100 extends the capability of the CDI 5000 series to the low flow rates found in many point-of-use applications. It does this by concentrating the flow into a small area that is chosen to optimize the tradeoff between pressure drop and low-flow sensitivity. Used in its intended flow range and at a pressure of 100 psig, the 5100 will create a pressure drop no greater than one psi.




  • Accurate measurement of small point-of-use flows
  • Minimal pressure drop
  • Weather resistant and surge protected
  • Milliamp output
  • Pulse output convertible to threshold output
  • User-configurable scaling, filtering and units of measure
  • Optional wired or wireless output for networking

Like the other 5000-series flowmeters, the 5100 is a thermal mass design, using one probe to sense the air temperature and maintaining the other ten degrees warmer. By concentrating the flow where it passes the two probes, it is able to measure low air flows without requiring small passages that could clog or create excessive pressure drops.

The meter is furnished with a carefully-reamed six-inch piece of 3/8-inch pipe to be installed where the air enters the meter. With this pipe in place, there is no other requirement for flow conditioning or straight upstream pipe. The meter may be installed between quick disconnect fittings to test air usage by small pieces of equipment.

Additional information

Nominal Pipe Sizes

3/8 in.

Range (scfm)



5 percent of reading plus 1 percent of the indicated range at a temperature of 68 degrees Fahrenheit and a pressure of 100 psig.


Compressed Air, Nitrogen

Operating Pressure

200 psig maximum on Sch. 40 steel and on Type L Copper; consult CDI for other materials and higher pressures.

Input Power

250 mA at 24 Vdc

Output Resistance

600 Ohms max.

Exposed Materials

Anodized aluminum, aluminum, gold, stainless steel, thermal epoxy and Buna-N (seal)


Four digit LED display

Response Time

One second to 63 percent of change in value at flows above 30 percent of range.



Model No Nominal Pipe Size Range (scfm) Price
5100-03S-20 0.375 in. 20 $525
5100-05S-40 0.5 in. 40 $575


Click the files below to download.

CDI 5100 Datasheet

CDI 5100 Instructions