Instruction Manual
D101351X012
646 Transducer
January 2015
18
Parts Ordering
A serial number is assigned to each transducer and stamped on the nameplate. Always refer to this serial number when
corresponding with your Emerson Process Management sales office regarding spare parts or technical information.
When ordering replacement parts, also specify the complete 11‐character part number from the Parts list.
WARNING
Use only genuine Fisher replacement parts. Components that are not supplied by Emerson Process Management should
not, under any circumstances, be used in any Fisher instrument. Use of components not supplied by Emerson Process
Management may void your warranty, might adversely affect the performance of the instrument, and could result in
personal injury or property damage.
Parts Kits
Description
Part Number
646 Transducer Repair Kit
Includes keys 6, 8, 9, 10, 12, 13, 14, and
18. The O‐ring for the converter module
is also included in the kit.
R646X000012
Parts List
Note
Part numbers are shown for recommended spares only. For part
numbers not shown, contact your Emerson Process Management sales
office.
Key
Description
1
Relay body assembly
2
Body block, aluminum
3
Housing assembly
1/2 NPT conduit connection
4
Housing Cap, aluminum
5
Body plug, aluminum
Key
Description
Part Number
6*
O‐ring, nitrile
1E5477X0062
7
Machine screw, stainless steel (4 req'd)
8*
O‐ring, nitrile
1H8762X0012
9*
Input diaphragm, nitrile
21B2362X012
10
Exhaust port assembly
12
Inner valve spring, stainless steel
13
Bias spring, steel pl
14*
Valve plug, stainless steel
21B2370X012
15
Wire retainer, steel pl (2 req'd)
16
Nameplate, w/o approvals, aluminum
17
Screw, stainless steel (2 req'd)
18*
O‐ring, nitrile
1C8538X0132
19
Screw, stainless steel (2 req'd)
20
Anti‐seize lubricant
(not furnished with transducer)
21
Pipe plug, use when gauge is not specified (not shown)
Alloy steel pl
Stainless steel
21*
Gauge, 0-30 psig/0-0.2 MPa/0-2 bar
(not shown)
11B8579X022
22
Anti‐seize sealant (not furnished with transducer)
41
Vent, plastic
42
Wire guide, SST
43
Wire lug
44
Set Screw (LCIE)
‐‐‐
Converter module
*Recommended spare parts