Current Meter Maintenance Model OSS-B1 Hydrographic Basics Training Course No. 27743.
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Transcript of Current Meter Maintenance Model OSS-B1 Hydrographic Basics Training Course No. 27743.
![Page 1: Current Meter Maintenance Model OSS-B1 Hydrographic Basics Training Course No. 27743.](https://reader038.fdocuments.in/reader038/viewer/2022102900/551a62c1550346b52d8b4977/html5/thumbnails/1.jpg)
Current Meter MaintenanceModel OSS-B1
‘Hydrographic Basics’ Training
Course No. 27743
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Section 1Prior To Discharge Measurements
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Prior To Discharge Measurements
• Remove fan assembly from carry case
• Turn fan carrier anti-clockwise
Anti-Clockwise
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Prior To Discharge Measurements
• Separate fan carrier from shaft assembly (keep away from contact with any dirt particles)
• Hold the fan upright and ‘fill’ with approved HS current meter oil
Use Lint Free Tissue
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Prior To Discharge Measurements
• Replace axle and fan carrier, excess oil will be forced up through the capillary gap around the axle, ensure fan carrier is tightened
• Wipe the excess oil of
the meter using lint free paper towel
Clockwise
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Prior To Discharge Measurements
• Do not forget to close the oil bottle straight after usage to avoid contamination of the oil
• Slide the fan assembly into the body and use the stubby screwdriver to tighten the retaining screw to lock the fan assembly in place
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Prior To Discharge Measurements
• Prior to spin test hold the current meter in the horizontal position and spin by hand for approx. one minute to get rid of the hydraulic pressure
• Spin test the meter against time to test the performance of the shaft and bearings
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Prior To Discharge Measurements
• Spin test results are dependent on the fan type
• Connect your current meter to the counter using the lead provided (this will test that the lead, reed switch and counter are working prior to use)
• If the current meter fails the spin test, disassemble and clean all components again.
• If the current meter continues to fail the test, replace bearings
OSS-B1 Spin Test
Fan No. Minimum Time (secs)
1 90
A 110
2 90
4 90
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Section 2During and After Discharge
Measurements
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During and after Discharge Measurements
After every discharge measurement, (or one hour of use), the current
meter should be cleaned and refilled with oil, if continuing a discharge
measurement.
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During and after Discharge Measurements
• Undo the cleaning jar cap and ‘¾ fill’ with white spirit
• Remove fan assembly from meter body by undoing the retaining screw and separate the body from the fan
Cleaning Jar
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During and after Discharge Measurements
• Remove fan carrier and shaft assembly (do not place in contact with dirt particles)
• Empty the old oil in a recycling container and dispose (do NOT re-use)
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During and after Discharge Measurements
• Put the shaft and bearing assembly into the cleaning jar.
• Agitate the jar • Fill up the fan with white
spirit, place your thumb over the hole and shake vigorously for a few seconds.
• Current meter body should be wiped clean with white spirit (there is no need to immerse)
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During and after Discharge Measurements
• Blow dry the shaft assembly, fan carrier and fan.
• Re-assemble the fan, coat bearings with a small amount of oil if discharge measurement is complete
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During and after Discharge Measurements
• Wipe box clean and return the fan assembly to the case
• If continuing a discharge measurement, refill the fan with oil
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During and after Discharge Measurements
• Spin test the current meter against time as shown in section 1
• After the spin test is performed connect your current meter to the counter using the lead, to test the lead, reed switch and counter.
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Section 3Office Cleaning
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Office Cleaning
Office cleaning should be performed on a monthly basis or whenever the
meter is dirty
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Office Cleaning
• Separate fan carrier from shaft assembly
• Current meter body should be wiped clean with soapy water (there is no need to immerse)
Anti-Clockwise
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Office Cleaning
• Separate fan carrier (1) from shaft assembly (2)
1 2
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Office Cleaning
Remove Nut Remove Bearing
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Office Cleaning
Remove Outer Spacer
Remove Inner Spacer
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Office Cleaning
Remove Bearing Fan assembly fully dismantled ready to clean
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Office Cleaning
Place items in sink, filled with hot soapy water, soak for at least 5 minutes
Clean items with a bottlebrush cleaner
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Office Cleaning
Cleaning Fan Cleaning Fan Carrier
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Office Cleaning
Cleaning outer spacer
Rinse full assembly with tap water
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Office Cleaning
• Place full assembly on lint free tissue
• Ready to dry and re-assemble
• Rinse all items in white spirit prior to re-assembly
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Office Cleaning
Dry Fan Carrier Dry Fan
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Office Cleaning
Dry Outer Spacer Dry Inner Spacer
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Office Cleaning
Blow Dry Bearing & Nut
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Office Cleaning
Start Shaft Assembly, Bearing First
Assemble Inner Spacer
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Office Cleaning
Assemble Outer Spacer
Assemble Bearing
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Office Cleaning
Assemble axle nut Dip shaft assembly in white spirit to lubricate
bearings
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Office Cleaning
Blow Excess White Spirit
Assemble Axle With Fan Carrier
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Office Cleaning
• Re-assemble fan and place in carry case Clockwise
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Section 4Calibration
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CalibrationAS 3778 ‘Measurement of water flow in open channels, Part 6.1, Section 7.6 ‘Recalibration’ states:
“Meters shall be recalibrated whenever their performance is suspect. In practice, for
individually rated meters, recalibration is sometimes carried out at yearly intervals or after
300 h of use, whichever is the shorter.”
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Questions?