Current Meter Maintenance Model OSS-B1 Hydrographic Basics Training Course No

Section 1 Prior To Discharge Measurements

Prior To Discharge Measurements Remove fan assembly from carry case Turn fan carrier anti- clockwise Anti- Clockwise

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

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

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

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

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) 190 A

Section 2 During and After Discharge Measurements

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.

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

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)

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)

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

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

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.

Section 3 Office Cleaning

Office Cleaning Office cleaning should be performed on a monthly basis or whenever the meter is dirty

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

Office Cleaning Separate fan carrier (1) from shaft assembly (2) 12

Office Cleaning Remove Nut Remove Bearing

Office Cleaning Remove Outer Spacer Remove Inner Spacer

Office Cleaning Remove Bearing Fan assembly fully dismantled ready to clean

Office Cleaning Place items in sink, filled with hot soapy water, soak for at least 5 minutes Clean items with a bottlebrush cleaner

Office Cleaning Cleaning FanCleaning Fan Carrier

Office Cleaning Cleaning outer spacer Rinse full assembly with tap water

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

Office Cleaning Dry Fan Carrier Dry Fan

Office Cleaning Dry Outer Spacer Dry Inner Spacer

Office Cleaning Blow Dry Bearing & Nut

Office Cleaning Start Shaft Assembly, Bearing First Assemble Inner Spacer

Office Cleaning Assemble Outer Spacer Assemble Bearing

Office Cleaning Assemble axle nut Dip shaft assembly in white spirit to lubricate bearings

Office Cleaning Blow Excess White Spirit Assemble Axle With Fan Carrier

Office Cleaning Re-assemble fan and place in carry case Clockwise

Section 4 Calibration

Calibration AS 3778 Measurement of water flow in open channels, Part 6.1, Section 7.6 Recalibration states: AS 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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