Micro Flowmeter DEA Engineering Company
       


fluid meter for low flow rates
Nutating Micro Flowmeter

       
Phone:(951) 5520102 | Fax:(951) 7631263 | E-mail: dealigio@deaengineering.com
 

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MAINTENANCE

[Click here for parts identification and location.]

Cleaning and Inspection

  1. The upper and lower halves of the Microflowmeter must be separated. If the meter is rigidly piped on the liquid and electrical sides one or more connections will have to be broken in order to permit the separation of the meter sections. These instructions assume that the lower section of the meter either remains fixed in the line or that the entire Microflowmeter has been removed from service and is securely held in a soft vice or other suitable fixture.

  2. Set aside a small clean work area lined with lint free rags or towels in which to clean the internal parts of the meter.

  3. Use a 7/16" wrench or socket to loosen the 4 hex head cap screws located on the bottom of the meter.

  4. While holding the meter together by hand, remove the 4 hex head cap screws.

  5. With the screws removed, carefully remove the top section from the meter. The top section should not be twisted since two locator pins [dowel pins] are installed between the upper and lower housing. The upper body housing will remain with the transmitter. Because of the close fit, the internal parts may cling to either the upper or lower housing. Use care not to drop or otherwise damage any internal parts.

  6. Carefully separate the internal parts [diaphragm, nutator, beam, balance plate, outlet bushing, anti - rotation pin and "O" rings] from the housings and each other.

  7. Inspect the inlet screen for signs of debris. To remove the screen for cleaning use a small flat-blade screwdriver to back out the screen retainer several turns. The screen retainer and screen can then be removed with small pliers or tweezers.

  8. Inspect the inlet and outlet threaded ports. If necessary the port threads may be "chased" with a 1/4" NPT tap.

  9. Flush out the lower housing with detergent, solvent, or other cleaning agent.

  10. The internal parts should be inspected for wear, corrosion, and deposits.

  11. The nutator and beam should be straight, if the nutator and/or beam are damaged they must be replaced.

  12. Clean all parts with a suitable detergent, solvent or other cleaning agent. Brush parts gently to remove deposits.

  13. Surfaces which cannot be cleaned by brushing may be gently scrubbed with a fine grade abrasive [1200 grit or finer]. This should be limited to the flat, relatively large areas of the body, diaphragm and balance plate. WARNING: Excessive material removal from the internal parts, especially the nutator, can effect the calibration factor and the accuracy of the Microflowmeter.

  14. After cleaning, the parts should be dried and blown off with clean air. If clean shop air is not available several aerosol, dust free, products are commercially available.

  15. Reassemble the internal parts in the following order: 570001-T017 "O" ring, outlet bushing, 570001-T006 "O" ring, 570310 dowel pin, balance plate, body, 570001-T118 "O" ring, nutator, beam, diaphragm,. WARNING: the "up" side of the nutator must be oriented facing the upper [electronics] section of the Microflowmeter. Before assembling the diaphragm, a drop of light weight machine oil may be added to the nutator to assist in startup.

  16. Reassemble the upper and lower sections. The dowel pins are positioned to insure the sections are aligned properly.

  17. Replace the 4 hex head cap screws and tighten evenly in a cross pattern to approximately 50 inch-pounds of torque.

  18. Connect a supply of regulated, filtered air or gas to the inlet of the Microflowmeter. Do not exceed 2 psig air pressure [normal lung power should be sufficient]. The meter should produce an audible hum indicating that the nutator is moving freely. If no sound is heard loosen the 4 hex head cap screws until the nutator can be heard. Allow the nutator to run a few seconds before re-tightening the hex head cap screws. If the nutator stops when the screws are tightened the meter must be re-cleaned.

  19. The electronic section of the meter may be checked at this time by connecting a suitable power supply and readout device. If the readout does not advance as the nutator is running the transmitter may be damaged. The transmitter is not field serviceable and must be returned to the factory for repair.

INSTALLATION AND MAINTENANCE INSTRUCTIONS