DEA
Engineering Company
Nutating
Micro Flowmeter
Phone:(951)
5520102 | Fax:(951) 7631263 | E-mail: dealigio@deaengineering.com
Mechanical Installation & Operating Considerations
Electronic Installation & Operating Considerations
Installation and Maintenance Instructions
MAINTENANCE
[Click
here for parts identification and location.]
Cleaning and Inspection
- 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.
- Set
aside a small clean work area lined with lint free rags or towels in
which to clean the internal parts of the meter.
- Use
a 7/16" wrench or socket to loosen the 4 hex head cap screws located
on the bottom of the meter.
- While
holding the meter together by hand, remove the 4 hex head cap screws.
- 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.
- Carefully
separate the internal parts [diaphragm, nutator, beam, balance plate,
outlet bushing, anti - rotation pin and "O" rings] from the housings
and each other.
- 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.
- Inspect
the inlet and outlet threaded ports. If necessary the port threads may
be "chased" with a 1/4" NPT tap.
- Flush
out the lower housing with detergent, solvent, or other cleaning agent.
- The
internal parts should be inspected for wear, corrosion, and deposits.
- The
nutator and beam should be straight, if the nutator and/or beam are
damaged they must be replaced.
- Clean
all parts with a suitable detergent, solvent or other cleaning agent.
Brush parts gently to remove deposits.
- 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.
- 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.
- 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.
- Reassemble
the upper and lower sections. The dowel pins are positioned to insure
the sections are aligned properly.
- Replace
the 4 hex head cap screws and tighten evenly in a cross pattern to approximately
50 inch-pounds of torque.
- 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.
- 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.
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