Universal Current Meter Training Model OSSB 1 Hydrological

Universal Current Meter Training Model OSS-B 1 Hydrological Services Pty Ltd Available for rent from Tech-Rentals

Section 1 Prior To Discharge Measurements

Prior To Discharge Measurements ●Open the case and pick up the Fan assembly ●Turn Fan Carrier Anti-Clockwise Anti. Clockwise

Prior To Discharge Measurements ●Remove fan carrier and shaft assembly (do not put it down anywhere it may attract dirt particles) ●Hold the fan upright and ¾ filling as shown in figure Use Lint Free Tissue

Prior To Discharge Measurements ● Replace axle and fan Clockwise 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

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. This is required to test the performance of the shaft and bearings

Prior To Discharge Measurements ●Spin test results are dependent on the fan type OSS-B 1 Spin Test Fan No. Time (sec) 1 Minimum 90 sec A Minimum 110 sec 2 Minimum 90 sec 4 Minimum 90 sec

Prior To Discharge Measurements ● After the spin test is performed connect your current meter to the counter using the lead, this important to test the lead, reed switch and counter.

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 filling with white spirit ●Remove fan assembly from meter body by undoing the retraining screw and separating the body from the fan Cleaning Jar

During and after Discharge Measurements ● Remove fan carrier and shaft assembly (do not put it down anywhere it may attract dirt particles) ● Empty the old oil in a recycling container (do not tip oil on the ground this will pollute the environment)

During and after Discharge Measurements ●Put the shaft and bearing assembly into the cleaning jar. ●Agitate them ●Fill up the fan with white spirit put your thumb in place of carrier and shake it really hard for a few seconds.

During and after Discharge Measurements ●Blow dry the shaft assembly, fan carrier and fan. ●Re-assemble the fan, if discharge measurement is finished

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, this important 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 and require a good cleaning to put it back in operation

Office Cleaning ●Dismantle Fan Carrier and shaft assembly from Anti. Clockwise

Office Cleaning ●Separate Fan Carrier (1) From Shaft assembly (2) 1 2

Office Cleaning ●Dismantle Shaft as shown in the figure ●Follow the images in sequence

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 in Sink Ready to Clean, Soak for at least 5 minutes Start Cleaning

Office Cleaning Fan Carrier

Office Cleaning Outer Spacer Rinse full assembly with Tap Water

Office Cleaning ● Place Full Assembly on a Lint Free Tissue ● Ready to dry and Reassemble.

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 ● Assemble Fan and Place In Carry Case. For The Next Field Trip Clockwise

Section 4 Calibration

Calibration ● Recalibrate the current meter every 300 hours of use or once a year which ever comes first (see Hydrological Services calibration certificate for details) ● For recalibration only, send the body and the fans that require calibration (to save weight). However, if other items needs repair they can be sent with the body and fans. Note: Hydrological Services provides a recalibration and repair service for all types of current meters.

O-ring replacement The following image shows the locations of the various O rings require to provide an adequate water seal in the system.