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GB 09 00 MA

Air Technique

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y Ty T

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ecec

hnique - see sehnique - see se

hnique - see se

parpar

par

te book.te book.

te book.

Optional ExtrOptional Extr

Optional Extr

as - see seas - see se

as - see se

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Air tecAir tec

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With TWIN air assistance energy is added to the spray

droplets to improve control with the spray liquid .

This way TWIN makes it possible to:

• carry the spray droplets safely to the target and

increase plant deposit

• minimize off-target deposit due to wind drift or loss on

the ground

• open the crop and

obtain good penetra-

tion even with a low

volume rate

• ensure a high

coverage.

he principleshe principles

he principles

The angle between

nozzles and air slot is

fixed. The system can

be angled hydraulically

ranging from 18°

forwards to 18° back-

wards.

( 0° = air vertical down )

Air speed / Air vAir speed / Air v

Air speed / Air v

olumeolume

olume

The fan speed is infinitely variable and can produce from

0 to 35 m/s (78 mph) air speed at the air outlet. This

equals from 0 to 2000 m

air/m boom/hour

(3.872 CFM/A boom/hour). The air speed must be

adjusted to the spray job

Adjustment ofAdjustment of

Adjustment of

air outlet and nozzles air outlet and nozzles

air outlet and nozzles

The fan air speed is adjusted either at the blower or it

can be set from the tractor cabin via a remote control

(optional extra).

A guiding air speed can be read via the oil pressure

gauge at the blower:

low (L) medium (M) high (H)

5-10 10-20 20-30

12 m boom 60-80 80-120 120-180

15 m boom 40-60 60-100 100-160

470-930 930-1870 1870-2800

Based on 25 bar back pressure.

Back pressure depends on tractor manufacture and series,

and it may well be below 25 bar, which means that the

blower r/min. and air speed could be higher than listed.

NOTE! Necessary oil flow: see Technical specifi-

cations.

SprSpr

Spr

ying instrying instr

ying instr

uctions - TWIN STREAM.uctions - TWIN STREAM.

uctions - TWIN STREAM.

InstrInstr

Instr

uction fuction f

uction f

or angor ang

or ang

ling ofling of

ling of

air and liquid. air and liquid.

air and liquid.

The angle should be used for adjusting the liquid/air flow

towards the wind direction.

• When driving with head-winds, adjust the slot for-

wards.

• When driving with down-winds, adjust the slot back-

wards.

• When driving with side-winds, the slot should be

adjusted as follows:

1) F1) F

1) F

orworw

orw

arar

d speed:d speed:

d speed:

• When the speed exceeds 8 km/h the slot should be

angled forwards (the faster the speed, the larger the

angle).

2) Cr2) Cr

2) Cr

op density and height:op density and height:

op density and height:

• When spraying low crops e.g. weed spraying in beets

or spraying bare soil a backwards angle is used. With

this adjustment reflection of the spray liquid can be

minimized as the air curtain works as a “shield” on top

of the spray liquid.

• When spraying high and dense covering crops (e.g.

potatoes) it would be an advantage to use the same

adjustment because of the good penetration ability.

• When spraying medium to high cereal crops efforts

are made - considering the forward speed - to obtain

a spray angle which penetrates the crop directly. The

crop should not be deflected so much during the air

influence that further droplet transport towards the

lower parts of the crop is blocked. When driving at

generally recommended speeds and under neutral

wind conditions the best adjustment will often be

slightly forwards.

• It is recommended to check the spraying quality

(deposit and penetration) with spray test paper.

Adjusting the air assistanceAdjusting the air assistance

Adjusting the air assistance

The air speed and angling must always be adjusted

individually for each spray job and the given weather

conditions.

It is always a good idea to get used to a new sprayer out

in a field with only water in the tank, on this occasion the

following routine for air adjustment should be practised:

1. Start with the air vertical

2. Set the air speed ............... A

3. Find the best angling ......... B

4. Readjust the air ..................A

IMPORTANT! Fine turning of air speed and angling will

often be necessary all through the spraying job.

It is easiest to find the best air setting to reduce drift

when the sun is low and behind the boom (backlight).

These conditions make the drift more visible.

Oil pressure at blower (bar)*

Air speed

m/s

Blower r/min

Brand	Hardi
Model	MASTER TWIN STREAM
Category	Paint Sprayer
Language	English

Hardi MASTER TWIN STREAM User Manual

Table of Contents

Questions and Answers:

Hardi MASTER TWIN STREAM Specifications

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