Macnaught MX Operating Manual
MXEX-INST
Rev 13
10/2019
MX06 - MX100
OVAL GEAR FLOWMETER SERIES
APPROVED FOR USE IN HAZARDOUS AREAS
INSTRUCTION MANUAL
EXPLOSION/ FLAME PROOF
To the Owner
Please read and retain this instruction manual to assist
you in the operation and maintenance of this product.
This manual contains connection and operating
instructions for the MX-Series Flow Meters with Pulse
Outputs.
Liquid Crystal Displays have an additional instruction
manual supplied. If you need further assistance,
contact your local representative or distributor for
advice
This Flow Meter has incorporated the oval gear
principle into its design. This is proven to be a reliable
and highly accurate method of measuring flow.
Exceptional repeatability and high accuracy over a
wide range of fluid viscosities and flow rates are
features of the oval gear design.
INTRINSICALLY SAFE
With low pressure drop and high pressure ratings,
oval gear flow meters are suitable for gravity and (inline) pump applications.
Macnaught offer a comprehensive set of web based
support materials to compliment this instruction
manual.
macnaught.com
Page 1 of 39
index
Installation
Important Information
Operating Principle
Installation Procedure
………………………………………………………….
………………………………………………………….
………………………………………………………….
Maintenance Procedure
Disassembly
Reassembly
………………………………………………………….
………………………………………………………….
Flow meter Specifications
Flow meter Specifications
Wiring Diagram
………………………………………………………….
………………………………………………………….
Service
Troubleshooting Guide
………………………………………………………….
Page 3
Page 3
Page 4
Page 4
Page 5
Page 6-8
Page 9-11
Page 12
Exploded Diagrams
Meter Cap Torques
Spare Parts Kits
Wetted Parts
General
Pressure Drop Graphs
Dimensional Diagrams
………………………………………………………….
………………………………………………………….
………………………………………………………….
………………………………………………………….
………………………………………………………….
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Page 13-14
Page 15
Page 16-18
Page 19-21
Page 22
Page 23-34
Page 2 of 39
IMPORTANT INFORMATION
NOTE
The information contained in this manual relating
to installation is guideline and should be treated
as such.
Please consult all relevant standards and
conditions required by the governing bodies in
area of installation prior to commissioning.
SAFETY BARRIER
The Exia sensors must be installed with an
approved safety barrier
GROUNDING
Improper grounding, poor ventilation, open
flames or sparks can cause a hazardous
condition and result in an explosion or fire and
cause serious injury.
STATIC
If there is static sparking or if you feel an electric
shock while using the meter, stop dispensing
immediately. Identify and correct the problem
before continuing.
NOTE
Equipment must be protected from impact at all
times.
OPERATING PRINCIPLE
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 directly to
an external receiving element (e.g. Data Logger or
PLC) or alternatively to an LC Display which
conditions the Pulse input signal to display volume of
fluid passed. (e.g. Display 1 Litre per for every 36
pulses received)
FLUID COMPATIBILITY
Before use, confirm the fluid to be used is
compatible with the meter. Refer to Industry
fluid compatibility charts or consult your local
representative for advice.
STRAINER
To prevent damage from dirt or foreign matter it
is recommended that a Y or Basket type
mesh strainer be installed as close as
possible to the inlet side of the meter.
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.
Page 3 of 39
INSTALLATION PROCEDURE
1. It is recommended that when setting up pipe work
for meter installations, a bypass line be included
in the design. This provides the facility for a meter
to be removed for maintenance without interrupt
ing production. (see figure above)
2. Use a thread sealant on all pipe threads.
Caution: Thread tape must not enter flow meter,
stopping 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.
4. Install a wire mesh strainer, Y or basket type
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” 400 micron / 40 mesh
5. Note: The flow meter can accept flow in any
direction.
6. The meter can be installed in any orientation as
long as the meter shafts are in a horizontal plane.
(Refer to diagram below for correct installation)
.
Note: Incorrect installation can cause premature
wear of meter components.
MAINTENANCE PROCEDURE
Note: Inspection and maintenance of installations
should only be carried out by experienced personnel,
whose training has included instruction on the
various types of protection and installation practices.
DISASSEMBLY
Note: Care should be taken not to drop, damage or
impact equipment due to risk of spark.
Non sparking tools should be used.
Meter should be removed from explosive
atmosphere when maintenance to any part of the
meter is required, the meter must be isolated and the
line pressure released.
Refer to the exploded parts diagram on pg.13-14 for
item numbers.
Note: 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)
2. Remove the O-Ring from the O-Ring groove in the
meter cap.
Wipe clean of grease and store in clean place
3. Remove rotors from the meter body
7. Do not over tighten meter connections.
8. It is important that after initial installation you
fill the line slowly, high speed air purge could
cause damage to the rotors.
9. Test the system for leaks.
Do not continue use if meter is leaking.
10. 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.
Page 4 of 39
MAINTENANCE PROCEDURE
REASSEMBLY
1. Before reassembling check the condition of the
rotors and bushes (replace if necessary).
2. There are two Rotor Types. Active and Neutral.
The Active Rotor is fitted with the magnets. They
can be identified by running a metal object over
the face of the rotor (smooth side)
Caution: The active rotor is always fitted
nearest ‘dimple’ on the meter body
(see FIG 3)
Replace Active Rotor.
Check the smooth side of the rotor is the leading
face when fitting onto the shaft and into the meter
body. (see FIG 2).
Replace Neutral Rotor. Check that the smooth
side of the rotor is the leading face when fitting
onto the shaft. (see FIG 2)
Fit the neutral rotor onto the shafts ensuring that
the rotor pair are at 90 degrees to one another.
(see FIG 3)
Check their operation by turning either of the
rotors. If the rotors are not in mesh correctly,
or do not move freely, remove one of the rotors
and replace correctly at 90 degrees to one
another.
3. Check condition of O-Ring and bolts, replace if
damaged.
Smear the O-Ring with a light film of grease.
Grease applied should meet the following
requirements:
Not harden with age.
Not contain an evaporating solvent.
Not cause corrosion of joint surfaces.
Replace the O-Ring into groove in the meter cap.
The O-Ring will need to be replaced if it has
grown or is damaged in anyway.
4. Replace the meter cap.
5. Insert the cap head screws and tighten in a
diagonal sequence 1, 5, 7, 3, etc.
(see Meter Torque Ratings, page 15)
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.
Note: When reassembling the meter , all joints
should be thoroughly cleaned and smeared with a
suitable grease to prevent corrosion and to assist
weather-proofing.
Blind bolt holes should be kept clear of grease. Only
non metallic scrapers and non corrosive cleaning
fluids should be used to clean flanges.
(see IEC 60079-14)
FIG 1
FIG 2
Rotor Face
Smooth side
Active Rotor
FIG 3
Dimple
Page 5 of 39
FLOWMETER SPECIFICATIONS
series MX06
Below 5 cP 2 to 100 LPH 0.5 to 26 GPH
Flow Range
K-Factor (Sensor Pulses per Unit of Measure) Refer to flow meter data plate
Temperature Range
Maximum Operating Pressure 6895 kPa
Accuracy of Reading ±0.5% of reading
5 to 1000 cP 0.5 to 100 LPH 0.13 to 26.4 GPH
1
(models MX06S)
(models MX06P)
series MX09
Flow Range
K-Factor (Sensor Pulses per Unit of Measure) Refer to flow meter data plate
Temperature Range
1
(models MX09S)
Below 5 cP 25 to 500 LPH 6.6 to 132 GPH
5 to 1000 cP 15 to 500 LPH 4 to 132 GPH
Metric US
-40°C - 120°C -40°F - 248°F
-40°C - 150°C -40°F - 302°F
1000 psi
Metric US
-40°C - 120°C -40°F - 248°F
(models MX09P)
Maximum Operating Pressure 6895 kPa
Accuracy of Reading ±0.5% of reading
series MX12
Flow Range
K-Factor (Sensor Pulses per Unit of Measure) Refer to flow meter data plate
Temperature Range
Maximum Operating Pressure 13790 kPa
Accuracy of Reading ±0.5% of reading
1
Flow meter process temperature range may be limited to sensor temperature classification. Consult relevant sensor data page
and approval documentation. Further information available from the Macnaught Technical Support Team.
1
(models MX12S)
(models MX12P)
-40°C - 150°C -40°F - 302°F
1000 psi
Metric US
Below 5 cP 3 to 25 LPM 0.8 to 6.6 GPM
5 to 1000 cP 2 to 30 LPM 0.5 to 8 GPM
-40°C - 120°C -40°F - 248°F
-40°C - 150°C -40°F - 302°F
2000 psi
Page 6 of 39
FLOWMETER SPECIFICATIONS
FLOWMETER SPECIFICATIONS
series MX19
Flow Range
K-Factor (Sensor Pulses per Unit of Measure) Refer to Flow meter data plate
Temperature Range
Maximum Operating Pressure 13790 kPa
Accuracy of Reading ±0.5% of reading
1
(models MX19S)
(models MX19P)
Below 5 cP 8 to 70 LPM 2 to 18.5 GPM
5 to 1000 cP 3 to 80 LPM 0.8 to 21 GPM
series MX25
Flow Range
K-Factor (Sensor Pulses per Unit of Measure) Refer to flow meter data plate
Temperature Range
1
(models MX25S)
Below 5 cP 10 to 100 LPM 2.6 to 26 GPM
5 to 1000 cP 6 to 120 LPM 1.6 to 32 GPM
Metric US
-40°C - 120°C -40°F - 248°F
-40°C - 150°C -40°F - 302°F
2000 psi
Metric US
-40°C - 120°C -40°F - 248°F
(models MX25P)
Maximum Operating Pressure 13790 kPa
Accuracy of Reading ±0.5% of reading
series MX40
Flow Range
K-Factor (Sensor Pulses per Unit of Measure) Refer to flow meter data plate
Temperature Range
Maximum Operating Pressure 10342 kPa
Accuracy of Reading ±0.5% of reading
1
Flow meter process temperature range may be limited to sensor temperature classification. Consult relevant sensor data page
and approval documentation. Further information available from the Macnaught Technical Support Team.
1
(models MX40S)
(models MX40P)
-40°C - 150°C -40°F - 302°F
2000 psi
Metric US
Below 5 cP 15 to 235 LPM 4 to 62 GPM
5 to 1000 cP 10 to 250 LPM 2.6 to 66 GPM
-40°C - 120°C -40°F - 248°F
-40°C - 150°C -40°F - 302°F
1500 psi
Page 7 of 39
FLOWMETER SPECIFICATIONS
series MX50
Flow Range
K-Factor (Sensor Pulses per Unit of Measure) Refer to flow meter data plate
Temperature Range
Maximum Operating Pressure
Accuracy of Reading ±0.5% of reading
1
(models MX50S)
(models MX50P)
Below 5 cP 15 to 500 LPM 4 to 130 GPM
5 to 1000 cP 15 to 500 LPM 4 to 130 GPM
series MX75
Flow Range
K-Factor (Sensor Pulses per Unit of Measure) Refer to flow meter data plate
Temperature Range
Maximum Operating Pressure
1
(models MX75S)
Below 5 cP 60 to 600 LPM 17 to 170 GPM
5 to 1000 cP 20 to 733 LPM 5 to 194 GPM
Metric US
-40°C - 120°C -40°F - 248°F
-40°C - 150°C -40°F - 302°F
8274 kPa
1200 psi
Metric US
-40°C - 120°C
1200 kPa
-40°C - 248°F
175 psi
Accuracy of Reading ±0.5% of reading
series MX100
Flow Range
K-Factor (Sensor Pulses per Unit of Measure) Refer to flow meter data plate
Temperature Range
Maximum Operating Pressure
Accuracy of Reading ±0.5% of reading
1
Flow meter process temperature range may be limited to sensor temperature classification. Consult relevant sensor data page
and approval documentation. Further information available from the Macnaught Technical Support Team
1
(models MX100S)
Below 5 cP 220 to 1000 LPM 60 to 250 GPM
5 to 1000 cP 120 to 1200 LPM 30 to 300 GPM
Metric US
-40°C - 120°C
1200 kPa
-40°C - 248°F
175 psi
High Viscosity Applications
Ensure the flow meter is fitted with ‘High Viscosity Rotors’ if the fluid being metered is typically 1000 cP or above. For further
information, contact the Macnaught Technical Support Team
High Viscosity Rotors For Fluids above 1000 Centipoise (cP)
Page 8 of 39
WIRING DIAGRAM Intrinsically Safe (Ex ia)
Output type ‘B’
CAUTION: This sensor must be installed with an approved safety barrier.
Pulser Specifications
SENSOR TYPE
SPECIFICATIONS
1
Refer to sensor certificates for complete markings, temperature ranges and approval codes
Omni Polar Supply Tracking , NPN with 3.1kΩ pull-up resistor
II 1 G Ex ia IIC T6...T4 Ga, T6@ -40°c ≤T
Markings
Construction 303 Stainless Steel Housing
Operating Voltage 5V to 30V DC @ ≤ 15mA
Maximum Sinking Current 25mA
Process Temperature Range
Approvals
Entity Parameters Ui = 30V, Ii = 100mA, Pi = 0.66W, Ci = 12nF, Li = 0
I.S Barrier (Associated Equipment)
1
Class 1, Zone 0, AEx/Ex ia IIC T6...T5
1
1
ATEX, IECEx, US & CAN (THROUGH FM)
ATEX & IECEx:
US & CAN:
Class 1, Division 1
GROUP ABCD T6...T5
T6 @ -40°c ≤T
-40°C - 65°C or -40°F - 149°F
Vmax, Ui ≥ Uo, Voc or Vt
Imax, Ii ≥ Io, Isc, It
Co or Ca ≥ Ci + Cc
Lo or La ≥ Li + Lc
amb
Pt or Po ≤ Pi
≤+65°c
Brown
≤+65°c
amb
Blue
End of Sensor
Brown
Black
Black
Blue
End of Mating Cable
Page 9 of 39
WIRING DIAGRAM Flame Proof (Ex D)
Output type ‘C’
Pulser Specifications
SENSOR TYPE Omni Polar Supply Tracking , NPN with 3.1kΩ pull-up resistor
ATEX & IECEx:
USA & CAN:
Class 1 Division 1
GROUP ABCD T6...T3
T3 @ Ta = -50°C… +140°C
Markings
II 2 G Ex db IIC T6...T3 Gb, T3@ Ta = -55°C… +140°C
1
Class 1, Zone 1, AEx/Ex db IIC T6...T3 Gb
SPECIFICATIONS
1
Refer to sensor certificates for complete markings, temperature ranges and approval codes
CAUTION: The green wire MUST be connected to an Earth ground
CAUTION: A poured conduit seal MUST be applied within 0.45m/18” of the sensor
Construction 303 Stainless Steel
Operating Voltage 5V to 27V DC @ ≤ 15mA
Maximum Sinking Current 25mA
Process Temperature Range
Approvals
1
1
-50°C - 140°C or -58°F - 284°F
ATEX, IECEx, US & CAN (THROUGH FM)
Flow Meter Process Connection Conduit Thread
G Thread
M20x1.5-6H
ANSI(AUS) / DIN / JIS
NPT Thread 1/2-14 NPT
ANSI (US)
Page 10 of 39
WIRING DIAGRAM Intrinsically Safe (Ex ia)
Output type ‘N’
CAUTION: This sensor must be installed with an approved safety barrier.
Pulser Specifications
SENSOR TYPE Magnet-inductive Proximity Sensor NAMUR
ATEX & IECEx:
SPECIFICATIONS
II 1 G Ex ia IIC T4...T6 Ga
Markings
Construction CuZn, Chrome-plate
Operating Voltage 8V to 15V DC
Maximum Current 5mA
Process Temperature Range
Approvals
Entity Parameters Ui = 20V, Ii = 60mA, Pi = 200mW, Ci = 150nF, Li = 150uH
1
Class 1, Zone 0, AEx/Ex ia IIC T5...T4
1
1
ATEX, IECEx, US (THROUGH FM AND CSA)
Class 1, Division 1
GROUP ABCD T4 resp. T5
T5 @ -25°c ≤T
-25°C - 70°C or -13°F - 158°F
US:
≤+70°c
amb
1
Refer to sensor certificates for complete markings, temperature ranges and approval codes
Com, Blue Vs, Brown
End of Sensor
Brown
Blue
End of Mating Cable
Page 11 of 39
TROUBLESHOOTING GUIDE
Problem Cause Remedy
Fluid will not flow
through meter
Reduced flow
through meter
Meter reading
inaccurate
Meter not giving a
pulse signal
a) Foreign matter blocking rotors
b) Line strainer blocked
c) Damaged rotors
d) Meter connections over tightened
e) Fluid is too viscous
a) Strainer is partially blocked
b) Fluid is too viscous
a) Fluid flow rate is too high or too low
b) Air in fluid
c) Excess wear caused by incorrect
installation
a) Faulty sensor
b) Magnets failed
a) Contact Macnaught
b) Clean strainer
c) Re-adjust connections
d) See specifications for maximum viscosity
a) Clean strainer
b) See specifications for maximum viscosity
a) See specifications for minimum and maximum flow rates
b) Bleed air from system
c) Check meter body and rotors. Replace as required. Refer
to installation instructions
a) Replace sensor
b) Replace magnets
Page 12 of 39
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