copy of lok test

8/9/2019 Copy of LOK Test

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Test of lever OperatedTest of lever Operated

continuous sprayercontinuous sprayer

A sprayer, theA sprayer, the

pump of which haspump of which hasto operatedto operated

continuously whilecontinuously while

liquid is dischargedliquid is discharged


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Test ProcedureTest Procedure

The specifications and setting details given byThe specifications and setting details given bythe manufacturer shall be checked andthe manufacturer shall be checked andconfirmed.confirmed.

Some of the items to be examined are :Some of the items to be examined are :-- Method of applying and maintaining pressure onMethod of applying and maintaining pressure on

spray liquidspray liquid

Capacity of liquid containersCapacity of liquid containers

Size of pump or diaphragmSize of pump or diaphragm Size and capacity of engineSize and capacity of engine

Weight of unitWeight of unit


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Volumetric efficiency, VVolumetric efficiency, Vee

Ve = (Volume discharged

per stroke / Piston

displacement)


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Test of pressure chamberTest of pressure chamber

If the sprayer is fitted with an external pressureIf the sprayer is fitted with an external pressure

chamber, this must be tested for leaks orchamber, this must be tested for leaks or

deformation.deformation.

The chamber shall be pressurised to a staticThe chamber shall be pressurised to a static

hydraulic pressure of at least twice the maximumhydraulic pressure of at least twice the maximum

recommended working pressure, which shall berecommended working pressure, which shall be

maintained for a minimum period of 5 minutes.maintained for a minimum period of 5 minutes.

During this period, the chamber shall beDuring this period, the chamber shall be

examined for leaks or deformation.examined for leaks or deformation.


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Discharge test of NozzlesDischarge test of Nozzles

The discharge from the nozzle shall beThe discharge from the nozzle shall be

measured at the maximummeasured at the maximum and minimumand minimum

pressures recommen

dedpressures recommen

ded byby thethe sprayersprayermanufacturer over a period of one minute.manufacturer over a period of one minute.

Measurements shall only be made whenMeasurements shall only be made when

the required pressure has stabilised andthe required pressure has stabilised and

the mean of five replications shall bethe mean of five replications shall berecorded for each type of nozzle used.recorded for each type of nozzle used.


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Spray distribution of NozzlesSpray distribution of Nozzles

Spray distribution is measured using aSpray distribution is measured using a"Pattemator" (Section 4.6.4)."Pattemator" (Section 4.6.4).

The nozzle shall be positioned above the benchThe nozzle shall be positioned above the benchin its normal working attitude to direct its sprayin its normal working attitude to direct its sprayon to the troughs of the distribution bench.on to the troughs of the distribution bench.

If the manufacturer indicates an optimumIf the manufacturer indicates an optimumworking height, the test shall be made at thisworking height, the test shall be made at thisheight as well as 150mm above and below thisheight as well as 150mm above and below this

height.height.


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Spray distribution (contd.)Spray distribution (contd.)

If the manufacturer does not indicate a workingIf the manufacturer does not indicate a workingheight, the test should be carried out at heights ofheight, the test should be carried out at heights of300, 400 and 500mm. The heights shall be300, 400 and 500mm. The heights shall be

measured from the ridges of the distribution benchmeasured from the ridges of the distribution benchto the nozzle orifices.to the nozzle orifices.

Tests shall be made at the maximum and minimumTests shall be made at the maximum and minimum

pressures recommended by the manufacturer andpressures recommended by the manufacturer andin the case of a compression sprayer of the nonin the case of a compression sprayer of the non--pressure retaining type, at the beginning, in thepressure retaining type, at the beginning, in themiddle and just before the end of discharge.middle and just before the end of discharge.


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Spray distribution (contd.)Spray distribution (contd.)

Test runs shall be made over a period of oneTest runs shall be made over a period of oneminute or until the liquid collected in one of theminute or until the liquid collected in one of thetubes reaches 90% of its capacity. The amounttubes reaches 90% of its capacity. The amountcollected from each groove shall be recordedcollected from each groove shall be recorded

and shown in the report as a table or a graphand shown in the report as a table or a graph(Fig 4.32). The graph will show the volume(Fig 4.32). The graph will show the volumecollected for each groove as a percentage of thecollected for each groove as a percentage of themean volume.mean volume.

The coThe co--efficient of variation shall be calculatedefficient of variation shall be calculatedfor each test.for each test.

Coefficient of variation =Coefficient of variation =

(Standard deviation/Mean value) x 100(Standard deviation/Mean value) x 100


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Horizontal Throw testHorizontal Throw test

Target cards are fixed to a series of ten rows ofTarget cards are fixed to a series of ten rows ofseven pegs, 1 meter above the ground.seven pegs, 1 meter above the ground.

The pegs are 1 apart between rows and 0.75 mThe pegs are 1 apart between rows and 0.75 mwithin rows, the first being 3within rows, the first being 3 mm from the sprayerfrom the sprayernozzle set at the same height as the targetnozzle set at the same height as the targetcards.cards.

The layout of the targets should be screenedThe layout of the targets should be screenedfrom prevailing winds and tests carried whenfrom prevailing winds and tests carried when

wind speeds are negligible.wind speeds are negligible. The targets are sprayed for 5 seconds with aThe targets are sprayed for 5 seconds with a

suitable dyed liquid.suitable dyed liquid.


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Horizontal throw (contd.)Horizontal throw (contd.)

The horizontal throw can be more simplyThe horizontal throw can be more simply

determined by spraying clean water on todetermined by spraying clean water on to

a dry concrete floor in winda dry concrete floor in wind--free area andfree area and

measuring the distance covered by themeasuring the distance covered by the

spray (Section 4.6.4).spray (Section 4.6.4).

Tests at various nozzle set should beTests at various nozzle set should be

carried out.carried out.


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Field conditionsField conditions

The following conditions will require to beThe following conditions will require to be

clearly stated for each type of plot :clearly stated for each type of plot :--

Size of plotSize of plot Type of cropType of crop

Height of cropHeight of crop

Distance between plants and rowsDistance between plants and rowsAmbient conditionsAmbient conditions


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Time of testTime of test

The sprayer shall be operated inThe sprayer shall be operated in

accordance with the manufacturersaccordance with the manufacturers

instructions on various plots andinstructions on various plots andtypes of crop for a total time of abouttypes of crop for a total time of about

20 hours using at least 2 operators.20 hours using at least 2 operators.


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Measurement/observationMeasurement/observation

The following items shall be measured orThe following items shall be measured orobserved :observed :--

Rate of workRate of work

Pesticide application ratePesticide application rate Comfort and fatigue of operatorComfort and fatigue of operator

Ease of filling, dismantling and maintenanceEase of filling, dismantling and maintenance

Ease of operation of lance or blower nozzleEase of operation of lance or blower nozzle

Leakage from tanks, pipes or valvesLeakage from tanks, pipes or valves Ease of control and maintenance of engineEase of control and maintenance of engine

Vibration of unitVibration of unit


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Test ReportTest Report

1. Diagram1. Diagram


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Test ReportTest Report-- SpecificationSpecification


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Hand operated SprayerHand operated Sprayer

Test Report- Specification (contd.)


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Motorized SprayerMotorized Sprayer


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Lab Test Results for ContinuousLab Test Results for Continuous

LOK SprayerLOK Sprayer Volume Efficiency testVolume Efficiency test

Pressure chamber testPressure chamber test

Nozzle testNozzle test Discharge testDischarge test

Spray distribution testSpray distribution test

Coefficient of variation ofCoefficient of variation of


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Volumetric EfficiencyVolumetric Efficiency


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Pressure Chamber testPressure Chamber test

Test No.Test No.

11 22 33 44 55


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Nozzle Discharge testNozzle Discharge test

Test No.Test No.

11 22 33 44 55


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Spray Distribution testSpray Distribution test


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Horizontal ThrowHorizontal Throw

No. of ReplicationNo. of Replication11 22 33 44 55

1. Type of nozzle1. Type of nozzle

2. Pressure2. Pressure3. No. of stroke3. No. of stroke

4. Time of spray4. Time of spray

5. Distance of spray from5. Distance of spray from

nozzle minimumnozzle minimum

6. Distance of spray from6. Distance of spray from

nozzle maxnozzle max


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Field testField test


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Field ConditionsField Conditions


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Sprayer and blowerSprayer and blower


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Results of testResults of test

Test No.Test No.

11 22 33 44 55


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Observations During testsObservations During tests

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