Flow Meters - Netafim · PDF fileVersion 3.00 LH20110714 NSA Product Guide – Flow Meters Page 3 DOCUMENT INFORMATION Indemnity Netafim South Africa (Pty) Ltd has taken all reasonable

Flow Meters Netafim South Africa Product and Design Guide

Version 3.00 LH20110714 NSA Product Guide – Flow Meters Page 1

TABLE OF CONTENTS

DOCUMENT INFORMATION ...................................................................................................................... 3

Indemnity ................................................................................................................................................... 3

Version and Date ........................................................................................................................................ 3

Acknowledgements .................................................................................................................................... 3

FLOW METER THEORY ............................................................................................................................... 4

Accuracy ..................................................................................................................................................... 4

Explanation of accuracy curve and terminology ........................................................................................ 4

Important points ........................................................................................................................................ 4

Flow Meter – Registers and Reed Switches ............................................................................................... 5

Flow Meter – Reed Switches ...................................................................................................................... 6

Reed Switch Selection ................................................................................................................................ 7

WATER FLOW METER – MULTI JET ............................................................................................................ 8

Technical Data ............................................................................................................................................ 8

Water Flow Meter Head Loss – Multi Jet ................................................................................................... 9

Water Flow Meter Head Loss – Multi Jet (MS40) ...................................................................................... 9

WATER FLOW METER – WMR ................................................................................................................. 10

Technical Data .......................................................................................................................................... 10

Water Flow Meter Head Loss – WMR ...................................................................................................... 11

WATER FLOW METER – IRT (IRRIGATION) ............................................................................................... 12

Technical Data .......................................................................................................................................... 12

Water Flow Meter Head Loss – IRT (Irrigation) ....................................................................................... 13

WATER FLOW METER – WOLTMAN WT II ................................................................................................ 14

Technical Data .......................................................................................................................................... 14

Water Flow Meter Head Loss – Woltman WT II ...................................................................................... 15

Turbo Operation – Woltman WT II .......................................................................................................... 15

WATER FLOW METER – WOLTMAN WST SB ............................................................................................ 16

Technical Data .......................................................................................................................................... 16

Water Flow Meter Head Loss – Woltman WST SB ................................................................................... 17

WATER FLOW METER – OCTAVE .............................................................................................................. 18

Technical Data .......................................................................................................................................... 18

Measuring Principle ................................................................................................................................. 19

Water Flow Meter Head Loss – Octave ................................................................................................... 19


Octave Installation: Location and position .............................................................................................. 20

Handling the flow meter .......................................................................................................................... 21

Important installation notes: ................................................................................................................... 21

Digital Display:.......................................................................................................................................... 21

ELECTRICAL OUTPUTS .............................................................................................................................. 22

Digital Output: Pulse ................................................................................................................................ 22

Analogue Output: 4 – 20mA .................................................................................................................... 22

FERTILIZER FLOW METER – SF 20mm ....................................................................................................... 23

Head Loss Data ......................................................................................................................................... 23

FERTILIZER FLOW METER – PVC 25mm .................................................................................................... 24

Head Loss Data ......................................................................................................................................... 24

FERTILIZER FLOW METER – INSTALLATION .............................................................................................. 25

DISCONTINUED PRODUCTS ..................................................................................................................... 26

Fertilizer counter - 20 mm KD .................................................................................................................. 26


DOCUMENT INFORMATION Indemnity Netafim South Africa (Pty) Ltd has taken all reasonable care in ensuring the integrity and reliability of the information contained in this document. Despite this Netafim South Africa (Pty) Ltd. takes no responsibility for any damage or loss that may result from the use of this manual. This document should be regarded as the property of Netafim South Africa (Pty) Ltd. This document is not intended for further training and neither may it be reproduced nor copied in its current form or temporary form. This document may not be revealed and/or carried over to any third party without the explicit written consent of Netafim South Africa (Pty) Ltd. This document is presented with the exclusive aim of notifying selected potential clients regarding NSA Product and Design Guide – Flow Meters. Receipt or the possession of this document does not imply rights and the contents should be viewed as a proposal only. This document is neither issued as a guarantee, nor does it confirm any legal obligations on Netafim South Africa (Pty) Ltd whatsoever. Netafim South Africa (Pty) Ltd reserves the right to make changes in its products and in the NSA Product and Design Guide – Flow Meters without prior notice.

Version and Date Version: 3.00 Last updated: 14 July 2011

Acknowledgements Netafim South Africa Arad


FLOW METER THEORY

Accuracy

The graph shows the percentage of accuracy (±) for the different flow range of a meter. All Netafim meters, with exception of the Dishnon, are tested and certified with a serial number and the test result with plus and minus accuracy limits and will be within the limits as described in the graph.

Original terminology New terminology

Explanation of accuracy curve and terminology

Qzero = Zero flow rate is when no flow is passing through the meter.

Qmin [Q1] = Minimum flow rate (m3/h) is the lowest flow rate measured within ±5% accuracy.

Qtrans [Q2] = Transitional flow rate (m3/h) is the lowest flow rate measured within ±2% accuracy.

Qnom [Q3] = Nominal flow rate (m3/h) is the upper limit for continuous working.

Qmax [Q4] = Maximum flow rate (m3/h) is the permissible peak flow rate for short periods (pipe filling).

Important points

Never use any meter between Qzero and Qmin [Q1] or above Qmax [Q4]

The best is to size the meter between Qtransitional [Q2] and Qnominal [Q3]

If required exceed Qnominal [Q3] by 10%

Always obey rules of installation:

- Position of meter will mostly be with dial facing upwards and horizontal.

- Straight pipe before (10d) and after (5d) meter, unless otherwise specified.

1. Install an air valve before flow meter. Air moves 29 times faster than water and will give incorrect readings and shorten the life of the meter.

2. Always install PRV (pressure reducing valve) downstream of the flow meter.

3. All meters should be constantly full of water during operation.

NB


Flow Meter – Registers and Reed Switches

Six-digit register, with big clear numerals for high totalizing capacity, standard with leak detector and three pointers for testing accuracy, which reduce testing time to minimum. Different registers are available:

1 2 3

Main unit

Register

Leak detector

Pointer - Left

Main unit m³ m³ m³ x 10

Pointer - Right 0.01 0.1 1

360° rotation = ℓ pulse 1 000 ℓ x 0.01 x 10 = 100 ℓ 1 000 ℓ x 0.1 x 10 = 1 000 ℓ 1 000 ℓ x 1 x 10 = 10 000 ℓ

Note: 360° rotation of the right hand side pointer will always equal the value of the last register digit.

Pointer - Centre 0.001 0.01 0.1

360° rotation = ℓ pulse 1 000 ℓ x 0.001 x 10 = 10 ℓ 1 000 ℓ x 0.01 x 10 = 100 ℓ 1 000 ℓ x 0.1 x 10 = 1000 ℓ

Pointer - Left 0.0001 0.001 0.01

360° rotation = ℓ pulse 1 000 ℓ x 0.0001 x 10 = 1 ℓ 1 000 ℓ x 0.001 x 10 = 10 ℓ 1 000 ℓ x 0.01 x 10 = 100 ℓ

IMPORTANT: Each meter has a dedicated register and is not interchangeable between different meters. All registers are marked to identify them, example (register 3) IRT 80 for Irrigation Meter 80 mm and Qn 90 m3/h to indicate the nominal flow rate of the meter. Below is an example of all the data for register 1 above.

Above register reading = 0.1 m3 or 100 litres 0.34 litre 1 litre 10 litre

Actual reading for above register at this point = 111.34 litres

6 Digit register Leak Detector

Pointers

Maximum reading 99999.9 m3 0.0001 of 1 m3 0.001 of 1 m3 0.01 of 1 m3

Value for each sub-division (10 sub-divisions) 0.1 litre 1 litre 10 litre

Value for full 360° rotation of the pointer 1 litre 10 litre 100 litre

Electric Volume output “EV”

Magnet fitted in place of one pointer

Reed Switch 1 pulse per revolution (Pointer must complete 360° turn for one pulse)

1 litre 10 litre 100 litre


Flow Meter – Reed Switches

A reed switch is a dry contact (activated by a magnet) that does not consume electric power, that consists of two metal plates that is normally open and the ends of one side are connected to wires (1.5 m) that can be connected to the control unit. The magnet installed in one of the pointer positions rotate as the gear ratio will determine and when it passes the reed switch (360° rotation of the pointer) the two metal plates will give a close contact and a pulse will be received by the control unit.

Specifications:

Maximum Volts Vmax = 48 Volt Maximum Ampere Imax = 50 mA Maximum pulses 2 Hz (2 pulses per second)

EV / Reed switch options:

Meter EV pointer colour Reed switch colour Note

SF Fertilizer (20mm)

Grey Grey Price list and stock items

PB Fertilizer (25mm)

Multi-Jet (15 – 50mm)

WMR (50 mm)

IRT (80 – 250mm)

WTII (80mm) Red / Purple Light Blue 10 litre EV, Replace by WSTSB

WST SB Purple Light Blue

KD Dishnon n/a Yellow Discontinued

Please note that the Woltman range WT, WST and WTII was not a stock item for NSA.

General rule:

If pointer is grey then reed switch must be grey.

If pointer is red or purple then reed switch must be light blue.

NB


Reed Switch Selection

Reed Switch Pulses Litre m³/h

ℓ/h m³/h 0.1 1 10 100 1 10 100

5 72 720 7200

25 14 144 1440

50 7.2 72 720

75 4.8 48 480

100 3.6 36 360 3600

150 2.4 24 240 2400

200 1.8 18 180 1800

250 1.4 14 140 1400

500 0.7 7.2 72 720

750 0.5 4.8 48 480

1000 1.0 0.4 3.6 36 360 3600

1500 1.5 0.2 2.4 24 240 2400

2000 2.0 1.8 18 180 1800

2500 2.5 1.4 14 140 1400

3000 3.0 1.2 12 120 1200

3500 3.5 1.0 10 103 1029

4000 4.0 0.9 9 90 900

4500 4.5 0.8 8 80 800

5000 5 0.7 7.2 72 720

10 0.4 3.6 36 360 3600

15 0.2 2.4 24 240 2400

20 1.8 18 180 1800

25 1.4 14 140 1400

30 1.2 12 120 1200

35 1.0 10 103 1029

40 0.9 9 90 900

50 0.7 7.2 72 720

100 0.4 3.6 36 360 3600

150 0.2 2.4 24 240 2400

200 1.8 18 180 1800

250 1.4 14 140 1400

500 0.7 7.2 72 720

750 0.5 4.8 48 480

1000 0.4 3.6 36 360

1500 0.2 2.4 24 240

ℓ/h m³/h 0.1 1 10 100 1 10 100

Reed Switch Pulses Litre m³/h

Do not select “grey values”. It will either give pulses to fast for the automation equipment or pulses will be to far apart and the "Un-Open" alarm will be activated. Check with automation supplier. Also see Automation Design criteria. When injecting fertilizer, pulse intervals are critical for reaction time.

For the Motorola "Single Cable" (Piccolo RTU) the frequency between pulses must be greater than 10 seconds. For Priva Equipment the frequency between pulses must be less than 10 seconds. Use above flow meter table to select a “Reed Switch” for Netafim Midrange Controllers (NMC).


Inlet Outlet

WATER FLOW METER – MULTI JET

For agriculture, domestic and industrial use. Assure an equally distributed load on impeller. Only impeller is in contact with the water.

Technical Data

Model M15 M20 M25 (Qn 5) MS 40 M50

Size – (Male BSP) 15 mm 20 mm 25 mm 40 mm 50 mm

Pressure - Maximum (m) 100 meter

Flow Rate qmax (ℓ/h) 3 000 5 000 10 000 20 000 30 000

Flow Rate qnominal (ℓ/h) 1 500 2 500 5 000 10 000 15 000

Flow Rate qtransitional (ℓ/h) 120 200 400 150 3 000

Flow Rate qmin (ℓ/h) 30 50 100 100 450

Accuracy qtransitional to qmax ± 2%

Accuracy qmin to qtransitional ± 5%

Head Loss See graphs

Maximum register capacity 105 m3/h 106 m3/h

Minimum register capacity 0.1 litre 1.0 litre

Temperature 0.1 to 50 ° C

Body Corrosion proof copper alloy

Installation Install with dial face horizontal, no straight pipe required before or after

Electronic Volume 1, 10, 100 Litre 10, 100 Litre, 1 m3

Dimensions

L – Length w/o tail pieces - mm 165 190 260 300 300

L1 – Length with tail pieces - mm 260 285 375 435 460

B – Width – (mm) 95 95 105 125 160

H – Height – (mm) 108 108 108 140 190

Weight w/o couplings (kg) 1.9 2.0 2.8 4.7 10.3

Weight with couplings (kg) 2.1 2.3 3.3 5.7 11.7

Note: 1. Qmax = Permissible peak flow for short periods only.


Water Flow Meter Head Loss – Multi Jet

Water Flow Meter Head Loss – Multi Jet (MS40)


Inlet

Outlet

WATER FLOW METER – WMR

For agriculture and industrial use. In-line helical axial turbine. High accuracy.

Technical Data

Model WMR 50

Size – (Male BSP) 50 mm

Pressure - Maximum (meter) 160

Flow Rate qmax (m3/h) 40

Flow Rate qnominal (m3/h) 15 (ISO 4064)

Flow Rate qtransitional (m3/h) 2

Flow Rate qmin (m3/h) 0.45



Head Loss See graphs

Maximum register capacity 106 m3/h

Minimum register capacity 1 litre


Body Polyester coated cast iron

Installation Install any position (non-horizontal = flow upwards)

Straight pipe requirement 10 d before and 5 d after meter

Electronic Volume 10 or 100 Litre

Dimensions

L – Length (mm) 200

H – Centre to Top (mm) 98

h – Bottom to Centre (mm) 40

Weight w/o couplings (kg) 2.3

Weight with couplings (kg) 3.7



Water Flow Meter Head Loss – WMR


WATER FLOW METER – IRT (IRRIGATION)

For agriculture use: Special design with free water passage. Negligible head loss. Simple maintenance. Field replaceable measuring unit.

Technical Data

Model IRT 80 IRT 100 IRT 150 IRT 200 IRT 250

Size – (Flange, see price list) 80 mm 100 mm 150 mm 200 mm 250 mm


Flow Rate qmax (m3/h) – Note 1 150 250 500 900 1 400

Flow Rate qnominal (m3/h) 90 125 250 450 750

Flow Rate qtransitional (m3/h) 10 11 15 30 70

Flow Rate qmin (m3/h) 5 7 10 18 20

Straight pipe requirement 10 d before and 5 d after 10 (5) d before and 5 (3) d after meter

Electronic Volume 100 Litre, 1 m3, 10 m3 1, 10, 100 m3

Installation Any position (horizontal, vertical or inclined)



Head Loss See graph

Maximum register capacity 106 m3/h 107 m3/h 108 m3/h

Minimum register capacity 1 litre 10 litre 100 litre



Dimensions

L – Length – (mm) 230 250 300 350 450

H – Height – (mm) 240 260 310 315 438

h – Base to Centre – (mm) 90 110 129 160 258

Weight – (kg) 17 20 33 49 57



Water Flow Meter Head Loss – IRT (Irrigation)


WATER FLOW METER – WOLTMAN WT II

Water supply networks, agricultural and industrial use. High accuracy, low loss of head and high immunity against abrasive media in water due to double magnetic coupling.

Technical Data

Model WT II 80

Size – (Flange, see price list) 80 mm


Flow Rate qmax (m3/h) – Note 1 170

Flow Rate qnominal (m3/h) 40 (ISO 4064)

Flow Rate qtransitional (m3/h) 1.4

Flow Rate qmin (m3/h) 0.8

Straight pipe requirement 5 d before and 2 d after meter




Head Loss See graph

Maximum register capacity 106 m3/h

Minimum register capacity 1 litre



Electronic Volume 10 Litre

Dimensions

L – Length – (mm) 230

H – Height – (mm) 234

h – Base to Centre – (mm) 90

B – Width – (mm) 200

Weight – (kg) 15.5



Water Flow Meter Head Loss – Woltman WT II

Turbo Operation – Woltman WT II

Register cover

Sealed register

Second magnetic coupling

Right angle transmission

Sealed dry chamber

First magnetic coupling


WATER FLOW METER – WOLTMAN WST SB

Water supply networks, agricultural and industrial use. High accuracy, low loss of head and high immunity against abrasive media in water due to double magnetic coupling. New bearing system.

Technical Data

Model – WST SB 50 65 80 100 150 200 250 300

Size (mm) Flange, see price list 50 65 80 100 150 200 250 300


Flow Rate qmax (m3/h) – Note 1 100 120 170 300 410 730 1 400 2 000

Flow Rate qnominal (m3/h) 50 80 120 230 260 450 750 1 000

Flow Rate qnominal (m3/h) ISO 4064 15 25 40 60 150 250 400 600

Flow Rate qtransitional (m3/h) 0.7 0.8 0.8 1.8 3.5 15 15 40

Flow Rate qmin (m3/h) 0.3 0.35 0.5 0.8 2.5 5 6 10

Straight pipe requirement 5 d before and 2 d after meter 10 d before and 5 d after




Head Loss See graph

Maximum register capacity 106 m3/h 107 / 106 m3/h 108 m3/h

Minimum register capacity 1 litre 1 / 10 litre 100 litre



Electronic Volume 10 Litre to 100 m3 (see price list)

Dimensions

L – Length – (mm) 200 200 230 250 300 350 450 500

H – Height – (mm) 214 228 234 250 310 338 438 465

h – Base to Centre – (mm) 70 84 90 106 130 158 258 330

B – Width – (mm) 165 185 200 200 283 340 406 460

Weight – (kg) 12 13 16 19 35 47 75 95



Water Flow Meter Head Loss – Woltman WST SB


WATER FLOW METER – OCTAVE

Octave the new revolutionary, precise and ultra reliable ultrasonic bulk water meter with superior hydraulic characteristics as well as advanced alert, data and statistical features.

Technical Data

Model – WST SB 50 80 100 150 200

Size (mm) Flange, see price list 50 80 100

In Development


Flow Rate Qpeak (m3/h) Note 1 75 120 200

Flow Rate Q4 (m3/h) qmax Note 1 65 (50) 100 (80) 150 (125)

Flow Rate Q3 (m3/h) qnominal 40 63 100

Flow Rate Q2 (m3/h) qtransitional 0.125 0.200 0.320

Flow Rate Q1 (m3/h) qmin 0.060 (0.080) 0.080 (0.125) 0.100 (0.200)

Starting Flow (ℓ) 15 15 15

Ratio: Q3/Q1 500 500 500

Installation See Octave installation, location and position

Accuracy Q2 to Q4 ± 2%

Accuracy Q1 to Q2 ± 5%


Body Epoxy coated cast iron, drinking water approval.

Dimensions

L – Length – (mm) 200 225 250

In Development

H – Height – (mm) 214 234 250

h – Base to Centre – (mm) 70 90 106

B – Width – (mm) 165 200 200

Weight – (kg) 12 16 19

Note: 1. Qmax = Permissible peak flow for short periods only. Values in brackets are for ISO 4064 rev 2005.


Measuring Principle

The sound wave that flows in the direction of the stream moves faster than the one that flows against the stream. The transit times tAB (transit time of ultrasonic waves from sensor A to sensor B) and tBA (from sensor B to sensor A) is measured continuously. The time difference (tBA - tAB) is directly proportional to the mean flow velocity (vm) of the product. The flow rate is a result of the velocity multiplied by the cross section of the size of the meter.

Water Flow Meter Head Loss – Octave


Octave Installation: Location and position

Proper Installation (Zero “d” before and after meter)

90° Elbows Low Point 45° Elbows Vertical 90° Elbows Vertical (upward flow)

Wrong Installation

90° Elbows High Point 90° Elbows Vertical (downward flow)

Installation requiring “d” before and after meter

“2 d” before and after isolating valves “2 d” before and Tee piece

Installation requiring “d” before and after meter

“5 d” after pump, “2 d” before isolating valves “2 d” after strainers (filters)


Handling the flow meter Important information:

Do not lift the Octave by the electronic housing.

Do not carry the Octave by its lid.

Do not place Octave on the electronic lid.

When handling the Octave, avoid hard blows or impacts.

Important installation notes:

For proper flow measurements, the Octave’s measuring tube should be completely full of

water at all times. Non-wetted sensors show loss of signal. Though this will not cause

damage to the meter, it will however not measure flow and will display zero.

The Octave is a bidirectional flow meter, please note the indicating arrow on the display for

flow direction (forward or backward flow).

In case of direct sunlight exposure, it is recommended to keep the lid close.

Do not expose the Octave to excessive vibration. To avoid vibration, support the pipeline on

both sides of the meter.

To avoid measuring errors due to air, observe the following precautions:

- Air collects at the highest point, never install meter at the highest point.

- Always install control valve (PRV) downstream of the meter to avoid cavitation.

- Never install meter on the suction side of a pump, to avoid cavitation.

Digital Display:

Power source: 2D size Li-battery with 10 years life time. NB


ELECTRICAL OUTPUTS

Digital Output: Pulse

The Octave has a dual pulse output.

It is an open collector pulse type that allows current of 200mA and up to 50 VDC.

The pulse is factory programmable with a maximum resolution value of 1 ms.

Standard cable length is 3m and can be extended to a maximum of 100m.

Output wire colours: - Black (GND) and Green = Output 1 - Black (GND) and Red = Output 2

Warning: Signal connection polarity is mandatory.

Pulse duration table (m3)

Pulse / selected quantity 0.0001 0.001 0.01 0.1 1 10 100 1 000

Maximum pulse width (ms) 1 10 90 125 125 125 125 125

Analogue Output: 4 – 20mA

The current output is a passive 4-20mA.

4mA is always “0” (zero) flow and 20mA is factory programmable according to the customer requirements. If the customer did not specify, the 20mA will be the maximum flow rate.

Cable length = 3m (maximum)

Loop supply voltage = 12 – 24 VDC

Output impedance = 25 *MΏ+ typ

Output wire colours: - Black = current loop “-“ - Red = current loop “+“

Warning: Signal connection polarity is mandatory.

NB

NB


Inlet Outlet

FERTILIZER FLOW METER – SF 20mm

Model SF Picture

Colour Black / Clear

Pressure - Maximum (m) 50


Flow Rate qmax (ℓ/h) - [±2%] 500

Flow Rate qtransitional (ℓ/h) - [±2%] 70

Flow Rate qmin (ℓ/h) - [±5%] 25

Pulse per 0.1 or 1.0 litre

Maximum Volts 28 VDC

Maximum Ampere 50 mA

Cable Length 1500 mm

Connection Detail 20 mm Male BSP

L - Length 110 mm

B - Width 77 mm

H - Height 81 mm

Weight 0.28 kg

Notes: 1. The pulse rate is determined by the ratio of the gears within the counter, thus the same reed switch is used for all models (0.1 and 1.0 litre per pulse). Order with “GREY” reed switch. 2. See installation instructions for piston or diaphragm pumps. 3. Install meter face horizontal.

Head Loss Data

Flow Rate (ℓ/h)

Head Loss (m)

Fertilizer Flow Meter SF - 15 mm

200 0.16

400 0.61

600 1.36

800 2.30

1000 3.60


Inlet Outlet

FERTILIZER FLOW METER – PVC 25mm

Model Qn 2.5 (PB20) Qn 5.0 (PB25) Picture

Size – (Male BSP) 25 mm


Flow Rate qmax (ℓ/h) 5 000 10 000

Flow Rate qnominal (ℓ/h) 2 500 5 000

Flow Rate qtransitional (ℓ/h) 200 400

Flow Rate qmin (ℓ/h) 50 100



Max register capacity 100 000 m3

Smallest readable unit 0.1 litre

Pulse per (see note 1) 1.0, 10 or 100 litre



Max switch contact rating 2 VA - DC

Switch actuating time 1 mS (including bounce)

Cable Length 1500 mm

Weight 0.875 kg


Notes: 1. The pulse rate is determined by the ratio of the gears within the counter, thus the same reed switch is used for all models (1.0, 10 and 100 litre per pulse). Order with “GREY” reed switch. 2. See installation instructions for piston or diaphragm pumps. 3. Install meter face horizontal.

Head Loss Data

Flow Rate (ℓ/h)

Qn 2.5 (PB20) Head Loss (m)

Qn 5.0 (PB25)

Head Loss (m) Fertilizer Flow Meter PB - 25 mm

1 000 0.30 0.20

2 000 1.28 0.70

3 000 3.20 1.80

4 000 6.50 3.50

5 000 n/a 6.00


FERTILIZER FLOW METER – INSTALLATION

Important:

1. Install dosing stock (fertilizer) tank 500 mm higher than dosing equipment. 2. Ball lever valve for tank isolation. 3. Chemical filter – over design. 4. Install dosing meter with register facing horizontal. 5. Dampening pipe (75 mm class 9 PVC) to absorb fake pulses. 6. N/C (normally close) fertilizer valve to prevent dosing under siphon conditions when no

dosing is programmed. 7. PVC pipes – always use class 9 or 12 pipe for structural strength and neatness of installation. 8. Install a non-return valve at injection point to mainline. 9. Always allow that dosing system can be isolated, that pressure can be removed when service

is required. Allow that dosing equipment can be flushed with clear water. 10. Select correct equipment (meters, valves and pump(s) and pipe sizes) - see individual product

specifications.

Fertilizer Pump

N/C Valve

Dampening Pipe

SF Fert Flow Meter

11

2" Filter

Ball Valve

To Main Line

NB: Non-Return Valve

Fert Tank

Concrete Tank Base

Maximum Fertilizer Level


Inlet

Outlet

DISCONTINUED PRODUCTS

Fertilizer counter - 20 mm KD

Model KD - N Picture

Colour Black


Flow - Minimum (ℓ/h) 60

Flow - Maximum (ℓ/h) 500

Pulse per (see note 1) 0.1 or 1.0 litre



Cable Length 950 mm

Connection Detail 20 mm Male BSP

L - Length 136 mm

B - Width 100 mm

H - Height 86 mm

Weight 0.3 kg

1. The pulse rate is determined by the ratio of the gears within the counter, same EPC

(electronic pulse counter) is used for both models (0.1 and 1.0 litre per pulse). 2. See installation instructions for piston or diaphragm pumps.

Head Loss Data

Flow Rate (l/h) Head Loss (m) Fertilizer Flow Meter - 20 mm KD

200 0.4

400 1.8

600 3.8

800 6.0

1000 n/a

NB

Documents

Flow Meters - Netafim · PDF fileVersion 3.00 LH20110714 NSA Product Guide – Flow Meters Page 3 DOCUMENT INFORMATION Indemnity Netafim South Africa (Pty) Ltd has taken all reasonable