Disassembling Relay; Parts Ordering; Parts Kits; Parts List - Fisher 2502 Series Level-Trol Instruction Manual

Beam overtravel can jam the flapper
against the nozzle if the following step
is not performed.
3. Remove the flapper screw (key 93), lockwasher
(key 84), and flapper (key 60). Invert the flapper so
that the flapper hook is on the opposite side of the
beam from the nozzle (key 58), and secure with the
lockwasher and screw.
4. Perform the calibration procedure and any other
necessary part of the calibration sequence.

Disassembling Relay

Disassembly can be accomplished in the following
steps. Key numbers are shown in figure 17.
1. Remove the relay according to the Changing Relay
section.
2. Remove the orifice assembly (key 88) and check
for orifice plugging or damage. Replace the O-ring
(key 90) before installing the orifice assembly.
3. Remove the casing screws (key 96) and washers
(key 98), casing assembly (key 85), and top dia-
phragm (key 91). On a high-temperature relay also
remove the top gasket (key 100) that covers the top
diaphragm.
4. Remove the spacer ring (key 84), diaphragm as-
sembly (key 86), and relay spring (key 92) from the
relay body (key 83). On a high-temperature relay also
remove the bottom gasket (key 99) from underneath
the diaphragm assembly.
5. Remove the screws (key 97), spring plate (key 95),
spring plate gasket (key 94), spring (key 93), and
valve plug (key 87).
6. Inspect the diaphragms and gaskets and replace if
necessary. Also replace the spring and valve plug if
they show signs of corrosion. The lower diaphragm
comes as part of an assembly and must be installed
as such. Clean all parts thoroughly before assembling.
7. Put the valve plug and its spring in the relay body.
Replace the spring plate gasket and spring plate and
secure with four screws.
8. Place the relay spring in the relay body and, on a
high-temperature relay, install a bottom gasket. Install
the diaphragm assembly, spacer ring, and top dia-
phragm on the body so that all flow passage holes are
lined up. On a high-temperature relay also install a
gasket over the top diaphragm.
9. Put the casing assembly on the top diaphragm so
that the lugs on the casing and spacer ring line up and
are also lined up with the body lug.
*Recommended spare part.
Note 10. Install the casing screws and tighten them slowly
to ensure a good seal.
11. Install the assembled orifice assembly, and install
the relay according to the Changing Relay section.

Parts Ordering

Whenever corresponding with the Fisher Controls
sales office or sales representative about this equip-
ment, always mention the controller type number and
the serial number found on the unit nameplate (figure
11). When ordering replacement parts, also state the
complete 11-character part number of each required
part as found in the following parts list.

Parts Kits

Key Description
Controller Parts Kit
Contains keys 12, 15, 21, 24, 38, 55, 57, 58, 60, 62, 63, 64,
77, 79, 84, 86, 87, 93, 101, and 187
Standard Temperature
High Temperature
Relay Parts Kit
Contains keys 22, 85, 86, 87, 88, 90, 91, 92, 93 and 94,
(99 and 100 high temp only)
Standard Temperature
High Temperature
Relay Replacement Kit
Contains keys 22, 43, and the relay assembly
Standard Temperature
High Temperature
Heat Insulator Parts Kit
Contains keys 35, 36, 37, 38, 39, 40, and 53

Parts List

Heat Insulator (figure 14)
35 Heat Insulator Assembly, stainless steel
36 Shaft Coupling, stainless steel
37 Shaft Extension, K-Monel
38 Set Screw, stainless steel (2 req'd)
39 Cap Screw, steel, pl (4 req'd)
40 Cap Screw, steel, pl (4 req'd)
53 Washer, carbon steel, pl (4 req'd)
Controller Common Parts (figure 16)
1 Pilot Case Back, zinc
Types 2502 and 2502C
Type 2502F
2 Pilot Case Cover, aluminum
3 Door Handle, steel, pl
4 Door Handle Shaft (not shown),
stainless steel
5 Machine Screw, stainless steel
6 Washer Spring, stainless steel
7 Door Hook, steel, pl
8 Elastic Stop Nut, steel, pl
9 Drive Pin, (2 req'd)
11 Relay Tubing
Copper
Stainless steel (2502 and 2502C only)
12* Ball Bearing Ass'y, brass, pl
2502 Series
Part Number
R2502 X0L52
R2502 X0H52
RRELAY X0L12
RRELAY X0H12
RRELAY X0L22
RRELAY X0H22
R2500XH 0012
22A0033 X012
1A5779 35032
1B6815 40022
1E6234 X0022
1A3816 24052
1V2395 28982
1B8659 28982
1J4157 44012
23A2073 X012
50B9454 X012
1C8972 25082
1C8984 14012
1C8958 X0022
1C8970 36032
1C8971 25082
1C8959 X0012
1C8991 X0022
17A9100 X012
17A9100 X022
1C8983 000A2
21