Brooks Instrument BM50 - Manual (Page 51)

4-3
Section 4 Maintenance
BM Oval Series
Installation and Operation Manual
X-PD-BM-Ovals-eng
Part Number: 541B031AAG
January, 2009
remove the four retaining screws on the display face (item 16). Lift off
the display unit and remove the 9 pin connector at the back of the
display unit. (Refer to Figure 5-3).
4. (See Figure 5-1) Reduce the pressure inside the meter to zero by
draining that section of the line which is isolated along with the meter. A
method other than removing the cover (Item 4) of the meter should be
used if available, i.e. strainer, drain plug, etc. If the pressure must be
reduced through the flowmeter, very slowly and carefully crack the
screws (Item 7) in the cover (Item 4) until the meter begins to drain
slowly thereby reducing the pressure to zero.
5. (See Figure 5-1) Drain the flowmeter completely by removing the cover
(Item 4) carefully.
4-4 Disassembly - Flowmeter (Refer to Figure 5-1)
Never use any gripping tool on any internal component of the meter. Do not
drop any part of the meter or damage can occur.
1. Remove cover screws (Item 7) and remove meter body cover (Item 4).
2. Remove O-ring (Item 2) and inspect. (Replace O-ring if damaged).
3. Remove rotors (Item 3), clean and inspect (Replace rotors if damaged).
Figure 4-1 Rotor Positions