Macnaught MX Series Manuel utilisateur

Page 1 of 31

INSTRUCTION MANUAL

MX SERIES

OVAL GEAR FLOWMETER

MXL-INST

Rev 12

12/2020

To the Owner

Please read and retain this instruction manual to

assist you in the operation and maintenance of this

product.

The manual contains operating and maintenance

instructions for the MX-Series Flow Meters. This

covers port sizes from 1/4” to 4”.

Refer to separate instruction manual for information

on operating modes and features of LCD displays.

Contact local representative or distributor for further

assistance.

This Flow Meter has incorporated the oval gear

principle into its design. Exceptional repeatability and

high accuracy over a wide range of fluid viscosities

and flow rates are features of the oval gear design.

With a low pressure drop and high pressure rating

oval gear flow meters are suitable for both gravity

and (in-line) pump applications.

Macnaught offers a comprehensive set of web based

support materials to complement this instruction

manual.

Access the Instruction manual by scanning below QR

code.

www.macnaught.com.au

Page 2 of 31

Index

Important Information Page 3

………………………………………………………….

Operating Principle Page 3

………………………………………………………….

Installation

Installation Procedure Page 4

………………………………………………………….

Maintenance Procedure

Disassembly Page 4

………………………………………………………….

Reassembly Page 5

………………………………………………………….

Pictorial Representation Page 6

………………………………………………………….

Flowmeter Specifications

Flow meter Specifications Page 7

………………………………………………………….

Flow Meter Output Types Page 8

………………………………………………………

Specification and Wiring - High Temp Sensor Page 16

…………………………………………..

Page 17

…………………………………………………………

Engraving / Data Plate Information

Installation of flanges Page 17

…………………………………………………………

Service

Exploded Diagrams Page 18

………………………………………………………….

Troubleshooting Guide Page 19

………………………………………………………….

Spare Parts Kits Page 20-21

………………………………………………………….

Wetted Parts Page 22

………………………………………………………….

General

Pressure Drop Graphs Page 23

………………………………………………………….

Dimensional Diagrams Page 24-30

………………………………………………………….

Page 15

……………………………………………….

PCB Specifications Standard/Industrial/DIN

Page 15

……………………………………………

PCB Circuit Diagram Standard/Industrial/DIN

Industrial Pulse Cap Details Page 11-12

…………………………………………………………

DIN Compact Pulse Module Page 13-14

…………………………………………………………

Standard pulser cap Details Page 9-10

…………………………………………………………

Page 3 of 31

IMPORTANT INFORMATION (READ CAREFULLY)

FLUID COMPATIBILITY: Before use, confirm the fluid (liquid) to be used is compatible with the meter. Refer to

industry fluid compatibility charts or consult your local representative or distributor for advice.

STRAINER: To prevent damage from dirt or foreign matter, it is recommended that a Y type or Basket type mesh

strainer be installed as close as possible to the inlet side of the meter.

 Meter 1/4” 74 micron / 200 mesh

 Meter 1/2”- 2” 250 micron / 60 mesh

 Meter 3”- 4” 420 micron / 40 mesh

When a strainer is installed it should be regularly inspected and cleaned. Failure to keep the strainer

clean will dramatically effect flow meter performance. Contact your local representative for advice.

AIR PURGE / LINE PRESSURE: To prevent damage caused by air purge, slowly fill the meter with fluid.

To reduce pressure build-up turn off the pump at the end of each day.

FLOWMETER USAGE: The flow meter shall be used exclusively with liquids. No gases permitted to flow.

Presence of gases could create severe hazard and damage

Fluid passing through the meter causes the rotors to turn, as shown below. One of the rotors (the active rotor) is

fitted with magnets.

The passing of the magnets are picked up by the electronic sensor. The excitation of this switch provides a „Raw

Pulse Output‟ which relates to the K-Factor. (e.g. KF 36 = 36 pulses per litre of fluid passed)

This Pulse Output Signal can either be fed to an external receiving element (e.g. Data Logger or PLC) or

alternatively to an LC Display which conditions the Pulse signal to display volume of fluid passed. (e.g. Display 1

Litre per for every 36 pulses received)

OPERATING PRINCIPLE

Page 4 of 31

INSTALLATION PROCEDURE

1. It is recommended that a bypass line be included

in the design. This provides the facility for a

meter to be removed for maintenance without

interrupting production. (see figure)

2. Use a thread sealant on all pipe threads. Thread

tape must not enter flow meter as this could stop

flow meters operation.

3. For pump applications ensure pipe work and

meter have the appropriate working pressure

rating to match the pressure output of the pump.

Refer to meter specifications section for further

details. (Page 7)

4. Install a Y type or basket type mesh strainer as

close as possible to the inlet side of the meter.

Meter 1/4” 74 micron / 200 mesh

Meter 1/2”- 2” 250 micron / 60 mesh

Meter 3”- 4” 420 micron / 40 mesh

The flow meter can accept flow in any direction.

5. The meter can be installed in any orientation as

long as the meter shafts are in a horizontal

plane as per the picture.

Incorrect installation can cause premature wear of

meter components.

Do not over tighten meter connections.

7. It is important after initial installation to fill the line

slowly, high speed air purge could cause damage

to the rotors.

8. Test the system for leaks. Do not continue use if

meter is leaking.

9. Check the strainer for swarf or foreign material,

after the first 200 litres, check periodically,

particularly if the flow rate is noted to be

decreasing.

When maintenance to any part of the flow meter is required, it must be isolated and line pressure released. It

must be removed from the line if required. Use non sparking tools to accomplish the job.

It is advisable to mark all components with a marker pen before disassembly, to ensure all the components are

replaced to their correct position during the reassembly process.

1. Remove the meter cap by loosening the bolts on the underside of the meter body. (see FIG 1, Page 6)

2. Remove the O-Ring from the O-Ring groove. Clean it nicely and store in clean place.

3. Remove rotors from the cap and shaft assembly. The shafts are fixed to the cap for sizes 1/4” - 2” and to the

body for 3” and 4” sizes. No need to take them off.

Do not remove shafts from their location.

Inspection and maintenance should only be carried out by experienced personnel.

MAINTENANCE PROCEDURE

DIS-ASSEMBLY

Page 5 of 31

1. Before reassembling, check the condition of flow meter parts (rotors, body, cap, seal O-ring and shafts). Re

place if necessary. Contact Macnaught to check for spare parts availability.

2. One of the rotors is active (have magnets) and other one is neutral. The active rotor can be identified by

running a metal object over the face of the rotor. Placed both the rotors at 90° to each other onto the shafts.

Spin them to check if they move freely. If not, repeat the process.

 Active Rotor Placement into Flow meter:

MX06 - MX09 Meters:

The active rotor is positioned nearest to „dimple‟ on the meter cap (see FIG 2, Page 6)

The smooth side of rotor showing up, grub screw will face downwards.

The chamfered side of the rotor stays upward when placed on to the shaft (see FIG 6, Page 6)

MX12 - MX50 Meters:

The active rotor is positioned nearest to „dimple‟ on the meter cap (see FIG 2, Page 6)

Meter cap dimple must face towards the flow meter body dimple (see FIG 2 & 3, Page 6)

The magnet side face upward when placed on the cap

For MX75 - MX100 meters:

Active rotor is positioned on to the shaft away from the flow meter foot. (see FIG 7, Page 6)

The magnet side of the active rotor face upward when placed inside the flow meter body.

3. Smear the O-ring with light film of grease and placed into the Groove (see FIG 3, Page 6)

4. Place the meter Cap on the meter Body.

Meter cap dimple must face towards the flow meter body dimple (MX06-MX50 Meters) (see FIG 2 & 3, Page 6)

5. Insert the cap head screws and tighten in a diagonal sequence 1, 5, 7, 3, etc.

Bolts Torque Ratings:

MX06-MX12 (6.5 Nm)

MX19-MX25 (15 Nm)

MX40-MX100 (33 Nm)

6. Test the meter by turning the rotors with a finger or by applying very low air pressure (no more than a good

breath) to one end of the meter, before returning the meter to service.

RE-ASSEMBLY

Page 6 of 31

Flow meter

FIG 1

Dimple

Shafts

Flow Meter Cap

FIG 2

Flow meter Body

FIG 3

Active

Rotor

Neutral

Rotor

Rotors (At 90°)

FIG 4

Groove

O-ring

FIG 5

PICTORIAL REPRESENTATION OF FLOWMETER AND DISASSEMBLED PARTS

Rotors Chamfer

Area

FIG 6

For MX06 and MX09 meters,

the flat side of rotors with

chamfer on edges face

upward when placed on cap

and shaft assembly of meter

MX75 - MX100 Meters

FIG 7

Flow Meter Foot

Dimple

Flow Meter Body

Shafts

Active Rotor

O-ring

Flow Meter Cap

Neutral Rotor

Page 7 of 31

Flow Meter Series Temperature Range

Temperature Range (MX06P - MX50P)-40°C - 150°C 1

Temperature Range (MX06S - MX100S)-40°C - 120°C 1

Temperature Range (MX06F - MX50F)-40°C - 80°C 2

Temperature Range (MX75F - MX100F)-40°C - 120°C 1

Accuracy (MX06 - MX100) ±0.5% of reading

Flow Meter

Series

Flow Range

(Viscosity < 5 cP)

Flow Range

(Viscosity > 5 cP)

Metric US Metric US

MX06 2 to 100 LPH 0.5 to 26 GPH 0.5 to 100 LPH 0.13 to 26.4 GPH

MX09 25 to 500 LPH 6.6 to 132 GPH 15 to 500 LPH 4 to 132 GPH

MX12 3 to 25 LPM 0.8 to 6.6 GPM 2 to 30 LPM 0.5 to 8 GPM

MX19 8 to 70 LPM 2 to 18.5 GPM 3 to 80 LPM 0.8 to 21 GPM

MX25 10 to 100 LPM 2.6 to 26 GPM 6 to 120 LPM 1.6 to 32 GPM

MX40 15 to 235 LPM 4 to 62 GPM 10 to 250 LPM 2.6 to 66 GPM

MX50 15 to 500 LPM 4 to 130 GPM 15 to 500 LPM 4 to 130 GPM

MX75 60 to 600 LPM 17 to 170 GPM 20 to 733 LPM 5 to 194 GPM

MX100 220 to 1000 LPM 60 to 250 GPM 120 to 1200 LPM 30 to 300 GPM

1Flow meter process temperature range may be limited to sensor temperature classification.

2Flow meter process temperature range is limited due to PPS rotors.

FLOWMETER SPECIFICATIONS

Ensure the Flow meter is fitted with ‘High Viscosity Rotors’ if the fluid being metered is 1000 cP or above.

Flow Meter

Series

Maximum

Operating Pressure*

(Flow meter Threaded)

Maximum

Operating Pressure*

(Flow meter Flanged**)

kPa psi kPa psi

MX06 6895 1000 - -

MX09 6895 1000 - -

MX12 13790 2000 - -

MX19 13790 2000 - -

MX25 13790 2000 1250 181

MX40 10342 1500 1250 181

MX50 8274 1200 1250 181

MX75 1200 175 1200 175

MX100 1200 175 1200 175

* Conforms to Directive 2014/68/EU

** Flanges Standard (ASME B16.5, Group 2-2.3 Materials)

Page 8 of 31

Flow meter Output Types

Pulse output

A1 x Hall Effect Switch & 1 x Reed Switch MXD-AS

IDual Reed Switches MXD-IS

JDual Hall Effect Switches - Quadrature Pulse MXD-JS

KHigh Resolution Sensor MXD-KS

THigh Temperature Sensor MXD-TS

Local Digital Display

DPR (LCD 12 mm Display) MXD-DS

EPRA * (LCD 12 mm Display) MXD-ES

FER (LCD 17 mm Display) MXD-FS

GERA * (LCD 17 mm Display) MXD-GS

HERB (LCD 17 mm Display) MXD-HS

MPRM * (LCD Blind 4 - 20 mA Display) MXD-MS

Display MXD-DS MXD-ES MXD-FS MXD-GS MXD-HS MXD-MS

Instruction Manual MXL-INSTPR MXL-INSTPRA MS574 MS476 MS392 MXL-INSTPRM

Instruction manual for local displays to be seen separately. Part numbers as under:

* Analogue outputs are available as an auxiliary display signal by including ERA, PRA and PRM with the flow

meter. PRA and ERA display also output scalable pulse.

Reed Switch: Reed Switch is a 2-wire device which

triggers by magnet inside the rotors as they spin. To

maximise the life of the reed switch, the pulse board

comes equipped with a 1k8Ω current limiting resistor

in series.

Hall Effect Switch: Hall Effect switch is a 3-wire

device which triggers by south pole of the magnet

inside the rotors as they spin. This switch is NPN

type. The switch circuit is equipped with a 4k7Ω pull

-up resistor between signal and supply.

Reed Switch

Hall Effect Switch

Page 9 of 31

Standard Pulse Cap Output types A, I, J, K WIRING INSTRUCTIONS

Standard Pulse Cap incorporates the M-LOCK (1/4” turn) mounting system. The housing is made up of

polypropylene with PCB fitted inside.

Standard Pulse Cap PCB

Page 10 of 31

Standard Pulse Cap Output types A, I, J, K

Illustration

Standard Pulse Cap fitted to 1” meter

* MXD-JS generate Quadrature Pulse Output

** MXD-KS has one hall effect high resolution sensor.

Assembly/Disassembly

1. Rotate the pulse cap 90° anticlockwise to disassemble

2. Pull the cap away from body

No Tool required to assemble/dissemble

3. Place pulse cap onto the body and rotate 90° clockwise to reassemble

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