Brooks Instrument 5861i - Manual (Page 29)

4-5
Installation and Operation Manual
X-TMF-5861i-MFC-eng
Part Number: 541B111AAG
November, 2008
Brooks ® Model 5861 i
Section 4 Maintenance
2. Unplug the sensor connector from the PC Board. Remove the two
screws securing the bracket (26) and PC Board (28). Remove the
bracket and PC Board.
3. Remove the two allen nuts (9) using an 1/8" allen wrench and
washers (10) securing the sensor assembly (7). Remove the sensor
assembly.
Note: Do not attempt to disassemble the sensor assembly.
4. Remove the sensor assembly O-rings (8) from the flowmeter body (1).
Using the Brooks O-ring removal tool will help prevent scratching the
sealing surface. (part of service tool kit liisted in Section 5, Table 5-2).
5. Remove the inlet and outlet fittings(11) from the flowmeter body (1).
6. Remove the 4 screws (5) from the end block (3) and carefully remove
the end block.
7. Remove the restrictor assembly (37) from the inlet side of the body(1)
using the header removal tool(part of service kit tool kit listed in section
5, Table 5-2). Note the rotational position of the restrictor assembly.
( Refer to Figure 4-2).
B. Assembly
Note: It is recommended that all O-rings be replaced during meter
assembly. All O-rings should be lightly lubricated with Fomblin
grease,
(part of O-ring kit, Section 5) prior to their installation.
1. Examine all parts for signs of wear or damage, replace as necessary.
2. Place a lightly lubricated O-ring (35) onto the header plate of the
restrictor assembly (37).
3. Install restrictor assembly into the restrictor cavity using the header
removal tool. Rotating the assembly slightly assists installation. It is
important that the restrictor assembly is put into the body in the same
orientation as it was prior to removal. (Refer to Section 4-6). Do not
press header assembly into body with an arbor press as it may damage
the O-ring.
4. Place the end block O-ring (6) in position and install end block (3) with
the 4 hex socket screws (5). Tighten these screws to 34 inch lbs. Do
not over tighten.
5. Install O-rings (19) on inlet and outlet fittings. Install fittings into body (1)
and end block (3).