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Compressed Air Flow Meter

Onset Flowmeter for Compressed Air Systems

Air Velocity Sensor >> Measurement Range of 1 to 80 SCFM
>> Measures Flow by Maintaining 1 Probe Warmer than the Other
>> Calculates the Mass Velocity from the Amount of Heat Required
>> Calculates the Flow on the Basis of Pipe Area
>> Display Shows Flow Directly with No Setup or Adjustment
>> Fits 1" Steel Pipes (2" Steel Pipe Version Available)
>> Easy to Install with No Moving Parts or Calibration
>> MiliAmp and Pulse Outputs
>> Includes 110 Volt DC Power Adapter w/ 20 ft. Cable

Compatible with
>> HOBO U30 Energy Monitor (with Analog Port Selection)
>> HOBO Energy Logger Pro (with Analog Module #S-FS-CVIA Required)

NOTE: Large Quantity Discounts Are Available!

  • Installation Notes
  • Specifications
  • Documentation
  • Purchase

Compressed Air Flow Meter Installation Notes

Drilling the holes to install the meter will release some metal shavings into the pipe. When planning the installation, make sure that all downstream equipment is protected by filters, or take other precautions to ensure that shavings do not reach critical equipment or get blown out in a way that could cause injury.

For best accuracy, the meter should be installed with at least 20 diameters of straight pipe upstream and three diameters downstream. Avoid installing the meter downstream of any item that could distort or concentrate the flow, such as a partially-closed valve, a regulator, a filter or moisture separator, two closely-spaced elbows in different planes, a long-radius elbow or a curved hose. Allow at least 30 diameters of straight pipe between any such item and the meter. Select a location that meets these requirements and also provides good visibility from the plant floor. If this is not possible, consider using the remote display discussed below.

To install the meter, first shut off the supply of air to the pipe where the meter will be mounted and allow the pressure to bleed down. Clamp the drill guide firmly to the pipe, orienting it for best visibility of the meter. Drill the two holes and remove any resulting burrs from the outside of the pipe. Make sure the out-side surface of the pipe is clean and smooth.

Once the pipe is prepared, remove the back halves of the rings, insert the probes into the holes in the pipe with the flow arrow pointing in the proper direction, and reassemble the rings. Tighten the cap screws firmly and evenly so that the gaps between the halves of the rings are about equal on both sides of the pipe. If the display is upside down, remove the cover of the meter, rotate it 180 degrees, and reinstall it.

Compressed Air Flow Meter Specifications

Measurement Range 1 to 80 SCFM
Accuracy 5% of Reading Plus 1% of Full Scale
(Air Temp 40°F to 120°F)
Medium Compressed Air, Nitrogen
Operating Pressure 30 to 170 psig For Best Accuracy.
200 psig Max on SCH 40 Steel
Response Time 1 Second to 63% of Final Value
Output 4 to 20 mA or Pulse (User Selectable)
Note: Pulse Input Adapter (#S-UCC-M006) Required for Pulse Output
Input Power 250 mA @ 18 to 24 Volts DC
Output Resistance 400Ω Max
Display 4-Digit LED
Ring Material Aluminum
Dimensions 81mm x 55mm x 40mm (3.2" x 2.2" x 1.6")
Weight 19.2 oz. (1.2 lbs.)

Compressed Air Flow Meter Documentation

Instructions on Connecting the Air Flow Meter to the H22 Energy Logger and U30 Energy Monitors. View PDF.


Compressed Air Flowmeter for 1.0" Steel Pipe Compressed Air Flowmeter for 1.0" Steel Pipe
>> Measurement Range: 1 to 80 SCFM
>> LCD Display Shows Flow Directly with No Setup
>> MilliAmp and Pulse Output
>> Includes 110 Volt Power Adapter
Price: $495.00
Part #: T-CDI-5200-10S

 

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