Macnaught MX Series User manual

Page 1 of 32
Intrinsically Safe with Simple Apparatus PCB
MX SERIES
OVAL GEAR FLOWMETER
MXEX-IS-INST
Rev 1
04/2022
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 with Ex
outputs. 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 ratings,
oval gear flow meters are suitable for gravity and
(in-line) pump applications.
Macnaught offer 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 32
Important Information Page # 3-4
Operating Principle Page # 5
Installation
Installation Instructions Page # 5-6
Earthing Points on Flow meter Page # 6
Maintenance Procedure
Disassembly Page # 7
Reassembly Page # 7
Pictorial Representation Page # 8
Flow meter Specifications
Product Identification System Page # 9
Flow meter Specifications Page # 10
Simple Apparatus PCB Page # 11
Intrinsically Safe Display ERX (Fx) Page # 12-13
Intrinsically Safe Display ERAX (Gx) Page # 14-15
Intrinsically Safe Batch Controller ERBX (Hx) Page # 16-17
Engraving / Data Plate Information Page # 18
Installation of Flanges Page # 18
Service
Exploded Diagrams Page # 19
Troubleshooting Guide Page # 20
Wetted Parts Page # 21
Spare Parts Kits Page # 22
General
Pressure Drop Graphs Page # 23
Dimensional Diagrams Page # 24-26
Certificates Page # 28-30
INDEX

Page 3 of 32
EQUIPMENT CATEGORY: The Macnaught oval gear flow meters are designed in category II 2 G according to
EN 60079-0 and EN 60079-11 for use in zone 1. The inside of the measuring unit is also approved for zone 1.
Macnaught declines any responsibility for the use of flow meters outside the designated Ex group, category and
zone.
The flow meters shall be rigorously used within the min-max rated temperature and pressure limits specified by
Macnaught. Failure to do so will result in high risk of explosion.
EU CONFORMITY: The manufacturer declares with the EU declaration of conformity on his own responsibility
conformity with the protection goals of directive 2014/34/EU for use in hazardous areas with gas. The EU
declaration of conformity for the equipment category II 2 G is based on the EU type technical file SIRA: SIRA
15XT063 Rev 4.
IMPORTANT INFORMATION (READ CAREFULLY)
POTENTIAL RISK OF EXPLOSION:
Do not run the flow meter in conditions that would cause overheating, damage and potentially create high risk of
explosion in hazardous area.
The flow meter must be protected from impact at all times: impact can cause mechanical sparking and result in
high risk of ignition/explosion
The flow meter external housing can made of Aluminium: contact between iron oxide (for example - rust iron) and
aluminium can cause sparks with high risk of ignition/explosion. Ensure no source of iron oxides are available
within the Ex zone where the flow meter is installed.
In the event a leakage on the flow meter is observed, process must be interrupted immediately and proper
maintenance carried out. Leakages could create dry run condition in the meter with resulting risk of ignition/
explosion.
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.
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.
• 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.
SAFETY BARRIER: Use appropriate safety barriers for outputs. Refer to below pages for Entity Parameters:
• Page 11 - Reed Switch
• Page 12 - ERX Display (Type Fx)
• Page 14 - ERAX Display (Type Gx)
• Page 16 - ERBX Display (Type Hx)
FLOWMETER USAGE: The flow meter Shall be used exclusively with fluids. No gases permitted to flow.
Presence of gases could create severe hazard and damage

Page 4 of 32
IMPORTANT INFORMATION (READ CAREFULLY)
Never expose the flowmeter register assembly to atmospheric agents as that may result in a deterioration of ex-
plosion protection and an increased risk of explosion.
Any alteration to the product (e.g. removal of the 3 plugs (IP67) on the housing, installation of cable glands, etc)
may result in a deterioration of explosion protection and an increased risk of explosion. Macnaught will not accept
any liability resulting from alterations to the product.
Only sound IP67 cable glands must be on the register housing to pull signal cable out of the register. Installation
must be carried out by qualified and trained personnel only. Macnaught will not accept any liability resulting from
use of cable glands.
INSTALLATION / SURROUNDING CONDITION
Extreme weather condition can deteriorate IP67 rated
equipment
Take necessary precautions against moisture
Take actions to avoid excessive Vibrations
Relative humidity must be less than 90% RH
Service/Repairs:
Don’t Service/Repair on-site as that may compromised explosion proof protection.
Contact Macnaught for Service/Repairs.

Page 5 of 32
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 to an external receiving element (e.g. Data Logger or PLC) or alterna-
tively 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)
EARTHING/EQUIPOTENTIAL BONDING:
The flow meter must be included in the on-site equipotential bonding system according to EN 60079-14. Proper
earthing and equipotential bonding provisions shall be in place and properly maintained on the flow meter and the
whole installation, as per EN/IEC 60079-14 or any other relevant applicable standards. Failure to do so would
result in high risk of static sparking and explosion. See Images on Page (5) for earthing/equipotential bonding
points on flow meter.
ELECTROSTATIC CHARGE:
In order to avoid ignition hazards due to electrostatic charge, flow meters may not be used in areas with:
• processes that generate strong charges,
• mechanical friction and cutting processes,
• spraying of electrons (e.g. in the vicinity of electrostatic painting systems) or
• pneumatically conveyed dust is exposed.
Electrostatic charging of the housing surface by friction must be avoided. The devices must not be dry cleaned.
If you feel an electric shock while using the meter, stop dispensing immediately. Identify and correct the problem
before continuing.
IMPORTANT NOTES:
After installation and before start up, the flow meter must be primed and the air in the pipework purged to avoid
onset of dry run conditions in the flow meter: that could cause damage and risk of explosion if persistent.
Do not install the flow meter in close proximity of a source of heat (for ex. furnace, heater) that can cause an
increase of flow meter temperature: hot surfaces on the flow meter can cause risk of explosion
Proper strainers/filers shall be used to avoid debris of foreign bodies to reach the oval gears: failure to do so
would result in severe damage and mechanical sparking with high risk of ignition/explosion.
INSTALLATION INSTRUCTIONS
INSTALLATION: Assembly, installation, start-up and maintenance may only be must be carried out according to
the applicable installation standards (e.g. IEC 60079-14) by qualified personnel trained in explosion protection!
The information given in the manual and these instructions must always be observed: failure to observe the
instructions on this manual will result in a high risk of explosion.
The operator or his agent is responsible for observing any additional standards, directives or laws if required due
to operating conditions or place of installation. This applies in particular to the use of easily detachable process
connections when measuring flammable media.
When an equipment fault is detected the device shall be de-energised and send back to the manufacturer for
repair.

Page 6 of 32
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, 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 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
INSTALLATION INSTRUCTIONS
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.
For MX06 to MX50 meters, one of the mounting
hole on flow meter cap can be used as Earthing
point. See below picture to locate that point:
EARTHING / EQUIPOTENTIAL POINTS ON FLOWMETER
For MX75 and MX100 meters, see below pictures
to locate Earthing point:
Meter Earthing Point Meter Earthing Point
MX06 M5 x 0.80 MX40 M8 x 1.25
MX09 M5 x 0.80 MX50 M8 x 1.25
MX12 M5 x 0.80 MX75 M8 x 1.25
MX19 M6 x 1.00 MX100 M8 x 1.25
MX25 M6 x 1.00
Earthing Points
Earthing Points
x 4

Page 7 of 32
MAINTENANCE PROCEDURE
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.
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 7)
2. Remove the O-Ring from the O-Ring groove. Wipe clean of grease 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.
DISASSEMBLY
Inspection and maintenance of installations should only be carried out by experienced personnel.
REASSEMBLY
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 7)
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 7)
MX12 - MX50 Meters:
The active rotor is positioned nearest to ‘dimple’ on the meter cap. (see FIG 2, Page 7)
Meter cap dimple must face towards the flow meter body dimple. (see FIG 2 & 3, Page 7)
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 7)
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 7)
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
7)
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.

Page 8 of 32
Flow meter
FIG 1
Flow Meter Cap
FIG 2
Flow meter Body
FIG 3
Active
Rotor
Neutral
Rotor
Rotors (At 90°)
FIG 4
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
Flow Meter Body
Shafts
Active Rotor
O-ring
Flow Meter Cap
Neutral Rotor
Dimple
Shafts
Groove
Dimple

Page 9 of 32
PRODUCT IDENTIFICATION SYSTEM
Series
MX
MX Port Size
06 1/4”
09 1/4”
12 1/2”
19 3/4”
25 1”
40 1 1/2”
50 2”
75 3”
100 4”
Category
PSS/SS/FEP
SS/PEEK/FEP MX06-MX50
S
AL/SS/FEP
AL/PEEK/FEP MX06 - MX25
AL/AL/FEP
AL/PEEK/FEP MX40 - MX100
-
-
Port Connection
1G threads MX06-MX100
3" BSP and NPT port connection for MX100
2NPT threads
3ANSI 150# Flanges
MX25 - MX100
4JIS 10k Flanges
5DIN PN 16k Flanges
6BSP (Rc) Threads MX06, MX09, MX12 and MX25
Rotor Type
PPEEK MX19S-MX50S
MX19P-MX50P
SStandard MX06-MX25 (SS)
MX40-MX100 (AL)
TMX06P-MX50PSS
VHigh Viscosity (SS / AL) MX09S-MX100S
MX09P-MX50P
Output
Type
Fx Ex Approved (NPN) sensor (Ex ia)
Gx Ex Approved (NPN) sensor (Ex d)
Hx Ex Approved (NAMUR) sensor (Ex ia)
Example
MX 06 P- 2T Fx

Page 10 of 32
Temperature Range & Accuracy
Temperature Range (MX06P - MX50P)-40°C - 70°C
Temperature Range (MX06S - MX100S)-40°C - 70°C
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
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)
FLOWMETER SPECIFICATIONS

Page 11 of 32
SIMPLE APPARATUS PCB (MX1R-IS)
The flowmeter is fitted with Simple Apparatus PCB (MX1R-IS) that conforms to the demands of Intrinsically Safe
environment.
Simple apparatus PCB is an electronic board fitted with Dual Reed Switches with 20-25 cm of wire (Alpha wire
3464C or better)
Ground Signal
Reed Switch S1 Green + Shield White
Reed Switch S2 Black + Shield Red
The MX1R-IS module is designed according to IEC 60079-0:2018 and IEC 60079-11:2012. It is completely pas-
sive, adds no energy to the circuits connected and complies with the applicable clauses for Simple Apparatus
(per IEC 60079-11) when used in conjunction with the Intrinsically Safe display
Both reed switch input circuits of the MX1R-IS module, are suitable for use as simple apparatus in type of protec-
tion intrinsic safety Ex ia IIC, only for connection to certified intrinsically safe circuits, with following maximum
values:
Ui = 10 V Li = 0 mH
Ii = 50 mA Ci = 0 µF
Pi = 200 mW
This product cannot be repaired by the user and must be replaced with an equivalent certified product. Re-
pairs should only be carried out by the manufacturer or his authorized agent.
Before Replacing/installing MX1R-IS board, the service man/installer must discharge himself by touching a
well-grounded object.
The MX1R-IS module must be installed in accordance with the EMC guidelines (Electro Magnetic Compati-
bility).
The relative humidity must be less than 90% RH.
Cable fitted to Simple Apparatus PCB is non-extendable
Do not connect reed switch to any external device

Page 12 of 32
Intrinsically Safe ERX display (Flow Indicator/Totalizer) Type (Fx)
Macnaught type Fx display uses:
Fluidwell Intrinsically Safe display electronic PN: F012-P-HR-PC-PD-XI-ZB
Wiring Instructions reference
www.fluidwell.com/assets/downloads/Manuals/FW-F012-P-M_v0404_01_EN.pdf?
Use this Instructions Manual if further details are required
Type Fx is an Intrinsically Safe digital register with a 17mm LCD display,
providing real-time indication of Flow rate, total (resettable) and accumulat-
ed total (non-resettable).
This display is IECEx, ATEX, CSA Canada and FM USA certified.
Locally mount to Macnaught Oval Gear Flowmeter with a Simple Apparatus
PCB
The flowmeter with Simple Apparatus PCB and Intrinsically Safe display is
IP67 rated
Ensure that the measuring system is correctly wired up according to the wiring diagrams. The housing may only
be opened by trained personnel
This product cannot be repaired by the user and must be replaced with an equivalent certified product. Repairs
should only be carried out by the manufacturer or his authorized agent.

Page 13 of 32
SETUP FUNCTIONS AND VARIABLES
1TOTAL
11 UNIT L - m³- kg - lb - GAL - USGAL - bbl - no unit
12 DECIMALS 0 - 1 - 2 - 3 (Ref: displayed value)
13 K-FACTOR 0.000010 – 9,999,999 (As per Flowmeter report)
14 DECIMALS K-FACTOR 0 – 6 (This seng depend upon seng 24)
2FLOW RATE
21 UNIT mL - L - m³- mg - g - kg - ton - GAL - bbl - lb - cf - REV - no
unit - scf - Nm³ - NL – P
22 TIME UNIT sec - min - hour - day
23 DECIMALS 0 - 1 - 2 - 3 (Ref: displayed value)
24 K-FACTOR 0.000010 - 9,999,999 (As per Flowmeter report)
25 DECIMALS K-FACTOR 0 - 6 (This seng depend upon seng 24)
26 CALCULATION per 1 - 255 pulses
27 CUTT-OFF 0.1 - 999.9 seconds
3DISPLAY
31 FUNCTION Total - Flowrate
32 BACKLIGHT (OPTIONAL) O - Green - Amber
33 BL. BRIGHTNESS 1 – 5
4POWER MANAGEMENT
41 LCD UPDATE Fast - 1 sec - 3 sec - 15 sec - 30 sec - o
42 BATTERY MODE Operaonal – Shelf
5FLOWMETER
51 SIGNAL REED_LP
6OTHERS
61 TYPE / MODEL F012 (Don’t touch)
62 SOFTWARE VERSION MCN0121 (Don’t touch)
63 SERIAL NO. 123456 ((Don’t touch))
64 PASS CODE 0000 – 9999 (Change if required)
65 TAG NUMBER 0000000 – 9999999 (Don’t touch)
Intrinsically Safe ERX display (Flow Indicator/Totalizer) Type (Fx)
For Programming, press PROG/ENTER button for 7 seconds.
Press CLEAR button to access functions and Press SELECT button to reach sub-functions
Setting up a value in sub function, press PROG and get use of buttons CLEAR & SELECT to adjust a value
Once the desired value is adjusted, press PROG button to finalize it
Once all sub functions are set, press PROG button for 3 seconds to go back to operational mode

Page 14 of 32
Intrinsically Safe ERAX display (Flow Indicator/Totalizer with Outputs) Type (Gx)
Macnaught type Gx display uses:
Fluidwell Intrinsically Safe display electronic PN: F110-P-AP-CX-HR-IX-OT-PC-PD-XI-ZX
Wiring Instructions reference
www.fluidwell.com/assets/downloads/Manuals/FW_F110P_v1901_02_EN.pdf?
Use this Instructions Manual if further details are required
Type Gx is an Intrinsically Safe digital register with a 17mm LCD display,
providing real-time indication of Flow rate, total (resettable) and accumulat-
ed total (non-resettable). The output include a 4-20mA and scaled pulse
output.
This display is IECEx, ATEX, CSA Canada and FM USA certified.
Locally mount to Macnaught Oval Gear Flowmeter with a Simple Apparatus
PCB
The flowmeter with Simple Apparatus PCB and Intrinsically Safe display is
IP67 rated
Ensure that the measuring system is correctly wired up according to the wiring diagrams. The housing may only
be opened by trained personnel
This product cannot be repaired by the user and must be replaced with an equivalent certified product. Repairs
should only be carried out by the manufacturer or his authorized agent.

Page 15 of 32
Intrinsically Safe ERAX display (Flow Indicator/Totalizer) Type (Gx)
For Programming, press PROG/ENTER button for 7 seconds. Press CLEAR button to access functions and
Press SELECT button to reach sub-functions. Setting up a value in sub function, press PROG and get use of but-
tons CLEAR & SELECT to adjust a value. Once the desired value is adjusted, press PROG button to finalize it.
Once all sub functions are set, press PROG button for 3 seconds to go back to operational mode
SETUP FUNCTIONS AND VARIABLES
1TOTAL
11 unit L - m³- kg - lb - GAL - USGAL - bbl - no unit
12 decimals 0 - 1 - 2 - 3 (Ref: displayed value)
13 k-factor 0.000010 – 9,999,999 (As per Flowmeter report)
14 decimals k-factor 0 – 6 (This seng depend upon seng 24)
2FLOW RATE
21 unit mL - L - m³- mg - g - kg - ton - GAL - bbl - lb - cf - REV - no unit -
scf - Nm³ - NL - P
22 me unit sec - min - hour - day
23 decimals 0 - 1 - 2 - 3 (Ref: displayed value)
24 k-factor 0.000010 - 9,999,999 (As per Flowmeter report)
25 decimals k-factor 0 - 6 (This seng depend upon seng 24)
26 calculaon per 1 - 255 pulses
27 cut-o 0.1 - 999.9 seconds
3DISPLAY
31 funcon total; rate
32 light 0% (o); 20%; 40%; 60%; 80%; 100% (full brightness)
4POWER MANAGEMENT
41 LCD update Fast - 1 sec - 3 sec - 15 sec - 30 sec - o
42 baery mode Operaonal - Shelf
5FLOWMETER
51 signal NPN - NPN_LP - REED - REED_LP
6ANALOG
61 output disable - enable
62 Rate-min 0000.000 - 9,999,999 unit/me unit
63 Rate-max 0000.000 - 9,999,999 unit/me unit
64 cut-o 0.0 - 9.9%
65 tune min – (0)4ma 0 - 9,999
66 tune max- 20ma 0 - 9,999
67 lter 00 - 99
7IMPULSE
71 width 0.000 - 9.999 sec (0 = O)
72 decimals 0000000; 111111.1; 22222.22; 3333.333
73 amount 0.001 - 9999999
Intrinsically Safe ERAX display (Flow Indicator/Totalizer with Outputs) Type (Gx)

Page 16 of 32
Intrinsically Safe ERBX Batch Controller with 1 x transistor output Type (Hx)
Type Hx is an Intrinsically Safe is a digital register with a 17mm LCD display,
providing a control output with 1 x NPN type transistor, for single stage batching
applications.
This display is IECEx, ATEX, CSA Canada and FM USA certified.
Locally mount to Macnaught Oval Gear Flowmeter with a Simple Apparatus
PCB
The flowmeter with Simple Apparatus PCB and Intrinsically Safe display is
IP67 rated
Macnaught type Hx display uses:
Fluidwell Intrinsically Safe display electronic PN: F030-P-HR-OT-PC-PD-XI-ZB
Wiring Instructions reference
www.fluidwell.com/assets/downloads/Manuals/FW-F030-P-M_v0404_01_EN.pdf?
Use this Instructions Manual if further details are required
Ensure that the measuring system is correctly wired up according to the wiring diagrams. The housing may only
be opened by trained personnel
This product cannot be repaired by the user and must be replaced with an equivalent certified product. Repairs
should only be carried out by the manufacturer or his authorized agent.

Page 17 of 32
Intrinsically Safe ERBX Batch Controller with 1 x transistor output Type (Hx)
For Programming, press PROG/ENTER button for 7 seconds.
Press STOP button to access functions and Press START button to reach sub-functions
Setting up a value in sub function, press PROG and get use of buttons START & STOP to adjust a value
Once the desired value is adjusted, press PROG button to finalize it
Once all sub functions are set, press PROG button for 3 seconds to go back to operational mode
SETUP FUNCTIONS AND VARIABLES
1TOTAL
11 UNIT L - m³- kg - lb - GAL - USGAL - bbl - no unit
12 DECIMALS 0 - 1 - 2 - 3 (Ref: displayed value)
13 K-FACTOR 0.000010 – 9,999,999 (As per Flowmeter report)
14 DECIMALS K-FACTOR 0 – 6 (This seng depend upon seng 24)
15 BATCH MAXIMUM X,XXX,XXX Quanty
2FLOW RATE
21 OVERRUN Disable - Enable
22 TIME 0.1 - 999.9 seconds
3DISPLAY
31 FUNCTION Total - Flowrate
32 BACKLIGHT (OPTIONAL) O - Green - Amber
33 BL. BRIGHTNESS 1 – 5
4POWER MANAGEMENT
41 LCD UPDATE Fast - 1 sec - 3 sec - 15 sec - 30 sec - o
42 BATTERY MODE Operaonal – Shelf
5FLOWMETER
51 SIGNAL REED_LP
6OTHERS
61 TYPE / MODEL F030 (Don’t touch)
62 SOFTWARE VERSION MCN0121 (Don’t touch)
63 SERIAL NO. 12345 (Don’t Touch)
64 PASS CODE 0000 – 9999 (Change If required)
65 TAG NUMBER 0000000 – 9999999 (Don’t touch)

Page 18 of 32
MX06-MX50: Serial number, Model number, k-factor,
flow rate range and temperature details are
engraved on meter body. See below FIG
MX75-MX100: Serial number, Model number,
k-factor, flow rate range and temperature details are
engraved on flow meter data plate. See below FIG
Flow meter Specs / Data Plate
Meter Lock Nut Torque ANSI / ASTM DIN JIS End to End
MX25 20 Nm 1" 150 LB B16.5 DN25 PN 16 EN1092-125A 10K JIS B 2220 240 mm
MX40 30 Nm 1.5" 150 LB B16.5 DN40 PN 16 EN1092-140A 10K JIS B 2220 240 mm
MX50 40 Nm 2" 150 LB B16.5 DN50 PN 16 EN1092-150A 10K JIS B 2220 264 mm
1. The locknut, gasket, O-ring and retaining ring to be fitted as shown in the below picture. Make sure that the
O-rings and gaskets must not have any damages.
2. Both flanges to be equally screwed to the meter body meeting end to end dimensions and bolt pattern on
the flange face
3. The lock nuts to be tightened to a specified torque as mentioned in the below table
Use a good quality grease for Gasket & O-ring and a good quality anti-cease on flange threads
INSTALLATION OF FLANGES ON MX25, MX40 AND MX50 METERS
Flow Meter Details
Flow Meter Details
Flow Meter Details

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EXPLODED DIAGRAM (Models MX06-MX50)
METER COMPONENTS ITEM NO
Display 1
CAM 2
CIRCLIP 3
METER BODY 4
ROTOR SHAFTS 5
ROTORS 6
METER CAP 7
METER CAP SCREWS 8
METER COMPONENTS ITEM NO METER COMPONENTS ITEM NO
METER BODY 1CIRCLIP 7
ROTOR SHAFTS 2METER CAP BOLTS 8
ROTORS 3FLANGE SEALS 9
METER CAP O-RING 4PROCESS CONNECTION (FLANGED OR THREADED) 10
METER CAP 5FLANGE WASHERS 11
CAM 6FLANGE BOLTS 12
EXPLODED DIAGRAM (Models MX75-MX100)

Page 20 of 32
TROUBLESHOOTING GUIDE
Problem Cause Remedy
Fluid will not flow
through meter
a) Foreign matter blocking rotors
b) Line strainer blocked
c) Damaged rotors
d) Meter connections over tightened
e) Fluid is too viscous
a) Dismantle meter, clean rotors (strainer must be fitted in
line)
b) Clean strainer
c) Replace rotors (Strainer must be fitted in line)
d) Re-adjust connections
e) See specifications for maximum viscosity
Reduced flow
through meter
a) Strainer is partially blocked
b) Fluid is too viscous
a) Clean strainer
b) See specifications for maximum viscosity
Meter reading
inaccurate
a) Fluid flow rate is too high or too low
b) Air in fluid
c) Excess wear caused by incorrect instal-
lation
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
LCD register not
working
a) Battery not connected properly
b) Battery flat
c) Faulty wiring connections
d) Faulty LC Display
e) Faulty connection from LC Display
Contact Macnaught
Macnaught provides an comprehensive set of ‘Maintenance Videos’ to assist the end user in
all aspects of service and / or repair of the flow meter range.
This web based resource can be accessed by scanning the QR.
MAINTAINENCE VIDEOS