Motor heat exchangers

[monjo]

Have a problem with dust buildup inside tubing of large motor's heat exchanger. Want to have measurements of air velocity/ flow into and out of exchanger to use as an indicator that tubes may need cleaning. Could someone reccomend any sensors/ probes etc which may be used? Has anyone used similar, and where would you mount them?

 

[jbartos]

Suggestion: Please, also post this in Mechanical Engineering Section of this Forum.
Pitot tubes may be considered. They may be installed in ducts.

 

[electricpete]

How about measuring dp.

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[aolalde]

Use a Differential Pressure Gauge. This type of gauge measures the differential pressure across two different areas, usually the inlet/outlet of filters. If the pipes congest, the difference in pressure in/out will increase. Regularly these are in the range of 0 to 8 inches of water pressure and some include auxiliary contacts.

 

[BJC]

Take a look at the Dwyer Magnehelic DP gauge/switch. They are an anlog device with a gague reading acturl pressure and a "red line" needle that sets the alarm point. You can see the trend as the DP rises toward the set point.

 

[gsimson]

Pressure switch at the inlet air, flow switch at the outlet, and temperature switches at the inlet & outlet are the standard instruments used for large machines. We can deduce leakages, chockages, excess heating in the motor etc