
Instruction Manual
D103799X012
685SE/685SR Piston Actuator
June 2017
2
Table 1. Specifications
Operating Pressure(1)
Minimum: 2.7 bar (40psig)
Maximum Allowable: 10.3 bar (150 psig)
Consult your Emerson sales office or Local Business
Partner for supply pressures under 2.7 bar (40 psi)
Travel(2)
25 mm (1 inch) through 610 mm (24 inch).
See table 2
Thrust Capabilities
Designed to meet the application requirements
Piston Diameter and Area(2)
Available in 51 mm (2 inch) increments between
254 mm (10 inch) and 711 mm (28 inch). See table 2
Operative Temperature Limits
Standard: -40 to 93_C (-40 to 200_F)
Low Temperature: -54 to 93_C (-65 to 200_F)(3)
High Temperature: -32 to 204_C (-25 to 400_F)(3)
Pressure Connections
See table 3
Yoke Boss and Valve Stem Diameter
J90.5 mm (39/16 inch) yoke boss with 19.1 mm (3/4
inch) stem J127 mm (5 inch) yoke boss with 25.4 mm
(1 inch) stem J127 mm (5 inch) yoke boss with 31.8
mm (11/4 inch) stem J127 mm (5H inch) yoke boss
with 32 mm (11/4 inch) stem J178 mm (7 inch) yoke
boss with 51 mm (2 inch) stem
Instrument Mounting
Mounting kits are available for use with FIELDVUE™
DVC6200 Series digital valve controllers
Manual Override (optional)
Size 10 to 26: Handwheel
Size 28: Hydraulic Hand-pump(4)
Construction Materials
PART MATERIAL
Yoke ASTM A36 (steel)
Piston ASTM A36 (steel)
Cylinder
254 to 559 mm (10 to 22 inch) cylinder:
1026 DOM (steel) with chromeplated bore
610 to 711 mm (24 to 28 inch) cylinder:
ASTM A516 Grade 70 (steel) with
fluoropolymer coated bore
Upper/Lower Heads ASTM A36 (steel)
Outer Spring Cartridge ASTM A36 (steel)
Tie Bolt ASTM A311 1045, Class B (steel)
Piston Rod S31603 (316L Stainless Steel)
Stem Connector ASTM A36 (steel)
Weights
See tables 4 and 5
Lifting Point Load Ratings
See table 6
Optional Certifications(5)
JPressure Equipment Directive (PED) 2014/68/EU
JComplies with the requirements of ATEX Group II
Category 2 Gas and Dust
JCustoms Union Technical Regulations (CU TR)
010/2011 and 012/2011
II Gb c T* X/III Db c T* X
Fisher 685SE and 685SR actuators have been
evaluated for ignition hazard and certified for CUTR
012/2011 under “protection by constructional
safety”. To ensure conformity with CUTR, only Fisher
parts and materials can be used.
1. The pressure/temperature limits in this instruction manual and any other applicable standard or code should not be exceeded.
2. Contact your Emerson sales office for larger travels or cylinder diameters. The Fisher 657, 667, and 585C family of actuators can be used for smaller travels or cylinder diameters.
3. Contact your Emerson sales office for applications requiring low or high temperature requirements.
4. Contact your Emerson sales office for applications requiring a manual override on a size 28 actuator.
5. Refer to the product nameplates to determine which certifications each actuator construction possesses.
Specifications
Specifications for the 685SE and 685SR piston actuators are shown in table 1. Refer to the nameplate affixed to the
actuator yoke for specifications specific to individual constructions.