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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
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