Brooks Instrument BM50 - Manual (Page 52)

4-4
Section 4 Maintenance Installation and Operation Manual
X-PD-BM-Ovals-eng
Part Number: 541B031AAG
January, 2009
BM Oval Series
4-5 Cleaning
Clean and inspect all parts removed from the flowmeter assembly. It is
recommended to wash all parts thoroughly in a light weight solvent. Dry
thoroughly with compressed air and/or lint free wipers.
4-6 Assembly - Flowmeter (Refer to Figure 5-1)
It is recommended that new O-rings be installed upon assembly. No
lubricant is recommended or required for the O-rings.
The following steps are required for meter assembly.
1. Place the rotors (Item 3) into the meter body. The rotors to be at 90° to
each other (As per Figure 4-1).
NOTE: The rotor with magnets must be placed in the body on the same
side as the groove on the body (Refer to Figure 4-1).
2. Check that the smooth side of rotors (not the plug side ) is facing you
when inserting the rotors, the smooth side of the rotor is the magnetic
side. There is no difference between rotor 1 or rotor 2.
Lightly rotate the rotors (Item 3) by hand (They must rotate freely).
3. If the rotor (Item 3) teeth mesh is not correct, disengage one rotor (Item
3) and rotate it one tooth clockwise or counterclockwise, then engage
teeth again. Repeat this procedure until the rotors (Item 4) are properly
meshed and will turn freely through several revolutions.
4. Install O-ring (Item 2).
5. Replace meter cap (Item 4).
NOTE: The locking pin in the body must line up with the hole in the cover.
6. Replace (item 7), Tighten in an alternate sequence.