Page 28/58IOM BiRotor Plus R27
6. Lubricate O-rings and install on the rotor
shafts. Mesh the two rotors together ensuring
that the tapered shafts are at the same ends.
The rotors should be held together with the
tapered end of the shaft facing the end plate
which is attached to the measuring element
housing. While keeping the rotors meshed and
even, insert them into the measuring chamber.
Use a plastic or rubber mallet to gently seat
the rotor shafts into the bearings.
7. Install the other end plate and screws on to the
other end of measuring element body ensuring
that the rotor shafts seat within the bearings.
8. Place the timing gears onto the respective
tapered rotor shaft. The timing gears have a
small hole for the location of the lock washer
tab; this should be facing outward from the
measuring element.
9. Install the lock washer ensuring the 90° tab
locates in the hole of the timing gears and nuts
to the rotor shafts. Tighten these only finger
tight until the clearances have been correctly
set. (Refer to section 9.8 Setting clearances)
10. Replace the pulse wheel on the right hand
rotor. Use thread locking compound on the
threads and secure with the retaining washer,
washer and screw.
11. Lower the complete measuring unit assembly
into the inlet housing by aligning on to the
dowel pins.
12. Position the main housing O-ring in the groove
on the inlet housing and position O-ring on
timing gear end of the measuring element
body.
13. Lower the outlet housing onto the inlet
housing, aligning the dowel pins to ensure
correct installation. Avoid damage to the
O-rings.
14. Complete the assembly by securing all screws
and tightening them to their required torque
value. (Table 9.7)
15. Install the O-ring on the sensor housing and
insert the assembly into the inlet housing.
Secure with four Allen screws and torque to 55
in/lbs.
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